Texas Instruments Music Mixer TPA0202 User Manual

User’s Guide  
May 1998  
Mixed-Signal Products  
SLOU016  
 
Preface  
Related Documentation From Texas Instruments  
TI Plug-N-Play Audio Amplifier Evaluation Platform (literature  
number SLOU011) provides detailed information on the evaluation  
platform and its use with TI audio evaluation modules.  
TPA0202 STEREO 2-W AUDIO POWER AMPLIFIER (literature  
number SLOS205) This is the data sheet for the TPA0202 audio  
amplifier integrated circuit.  
FCC Warning  
This equipment is intended for use in a laboratory test environment only. It  
generates, uses, and can radiate radio frequency energy and has not been  
tested for compliance with the limits of computing devices pursuant to subpart  
J of part 15 of FCC rules, which are designed to provide reasonable protection  
against radio frequency interference. Operation of this equipment in other  
environments may cause interference with radio communications, in which  
case the user at his own expense will be required to take whatever measures  
may be required to correct this interference.  
Trademarks  
TI is a trademark of Texas Instruments Incorporated.  
iii  
 
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If You Need Assistance. . .  
If you want to. . .  
Do this. . .  
Request more information about  
Texas Instruments mixed signal  
products  
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(972) 644–5580  
Or send a fax to the PIC:  
(972) 480–7800  
Or write to:  
Texas Instruments Incorporated  
Product Information Center, MS 3123  
P.O. Box 660246  
Dallas, Texas 75266  
Order Texas Instruments docu-  
mentation  
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lems  
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Correction: (972) 480–3160  
Or send your comments to:  
Texas Instruments Incorporated  
MSP Marketing Documentation, MS 8710  
P.O. Box 660199  
Dallas, Texas 75266–0199  
Texas Instruments Product Information Center  
iv  
 
Contents  
1
2
3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1  
1.1  
1.2  
1.3  
Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2  
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3  
TPA0202 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4  
Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1  
2.1  
2.2  
2.3  
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2  
Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3  
Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5  
Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1  
3.1  
3.2  
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
The TPA0202 Audio Power Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
3.2.1 TPA0202 Audio Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4  
3.2.2 Depop Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5  
3.2.3 BTL Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5  
3.2.4 SIngle-Ended Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6  
3.2.5 Inputs and Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6  
Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform . . . . . . . . . . . . . . . 3-7  
3.3.1 Installing and Removing EVM Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7  
3.3.2 TPA0202 Module Jumper Settings and Switches . . . . . . . . . . . . . . . . . . . . . . . . 3-8  
3.3.3 Signal Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11  
3.3.4 Mute/Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12  
3.3.5 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14  
3.3.6 Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15  
Using The TPA0202 EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16  
3.4.1 TPA0202 EVM Connected for BTL Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16  
3.4.2 TPA0202 EVM Connected for Single-Ended Output . . . . . . . . . . . . . . . . . . . . . 3-17  
TPA0202 Audio Power Amplifier Evaluation Module Parts List . . . . . . . . . . . . . . . . . . . 3-18  
3.3  
3.4  
3.5  
v
 
Figures  
1–1  
2–1  
2–2  
2–3  
3–1  
3–2  
3–3  
3–4  
3–5  
3–6  
3–7  
3–8  
3–9  
The TI TPA0202 Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3  
Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2  
Module Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4  
Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5  
The TI Plug-N-Play Audio Amplifier Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2  
TPA0202 EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3  
TPA0202 EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4  
TPA0202 Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5  
TPA0202 EVM Jumpers and Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8  
Platform Signal Routing and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11  
Mute/Mode and Polarity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12  
Typical Headphone Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15  
TPA0202 EVM Connected for Stereo BTL Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16  
3–10 TPA0202 EVM Connected for Stereo Single-Ended Output . . . . . . . . . . . . . . . . . . . . . . . . 3-17  
Tables  
2–1  
2–2  
2–3  
2–4  
3–1  
3–2  
3–1  
Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA0202 . . . . . . . . . 2-1  
Typical TPA0202 EVM Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1  
Platform Jumper and Switch Settings for the TPA0202 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3  
Typical TPA0202 EVM Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4  
Typical TPA0202 EVM Jumper Settings for BTL Stand-Alone . . . . . . . . . . . . . . . . . . . . . . 3-16  
Typical TPA0202 EVM Jumper Settings for Single-Ended Stand-Alone . . . . . . . . . . . . . . 3-17  
TPA0202 EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18  
vi  
 
Chapter 1  
Introduction  
This chapter provides an overview of the Texas Instruments (TI ) TPA0202  
Audio Amplifier Evaluation Module (SLOP202). It includes a list of EVM  
features, a brief description of the module illustrated with a pictorial diagram,  
and a list of EVM specifications.  
Topic  
Page  
1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2  
1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3  
1.3 TPA0202 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4  
1-1  
 
Feature Highlights  
1.1 Feature Highlights  
The TI TPA0202 Audio Amplifier Evaluation Module and the TI Plug-N-Play  
Audio Amplifier Evaluation Platform include the following features:  
TPA0202 Stereo 2-W Audio Power Amplifier Evaluation Module  
Internal depop circuitry to eliminate turn-on transients in outputs  
Dual channel, bridge-tied load (BTL) or single-ended operation  
3.3-V and 5-V operation  
2 W per channel output power into 3 at 5 V, BTL  
850 mW per channel output power into 3 at 3.3 V, BTL  
Ultra-low current consumption in shutdown/mute mode (5 µA)  
Internal input MUX selects among two sets of stereo inputs  
Module gain adjustable between approximately 2 and 22  
Quick and Easy Configuration with The TI Plug-N-Play Audio Amplifier  
Evaluation Platform  
Evaluation module is designed to simply plug into the platform,  
automatically making all signal, control, and power connections  
Platform provides flexible power options  
Jumpers on the platform select power and module control options  
Switches on the platform route signals  
Platform provides quick and easy audio input and output connections  
Platform Power Options  
External 5-V – 15-V DC V  
supply inputs  
CC  
External regulated V  
supply input  
DD  
Socket for on-board 5 V/3.3 V V  
voltage regulator EVM  
DD  
On-board overvoltage and reverse polarity power protection  
Platform Audio Input and Output Connections  
Left and right RCA phono jack inputs  
Miniature stereo phone jack input  
Left and right RCA phono jack outputs  
Left and right compression speaker terminal outputs  
Miniature stereo headphone jack output  
1-2  
Introduction  
 
Description  
1.2 Description  
The TPA0202 Stereo 2-W Audio Power Amplifier Evaluation Module is a  
complete, 2-Watt per channel stereo audio power amplifier. It consists of the  
TI TPA0202 Stereo 2-W Audio Power Amplifier IC along with a small number  
of other parts mounted on a circuit board that measures approximately 2  
inches by 1 inches (Figure 1–1).  
Figure 1–1. The TI TPA0202 Audio Amplifier Evaluation Module  
R11  
S6  
C7  
RVDD  
GND  
S5  
R10  
R8  
RHP  
GND  
RIN  
ROUT+  
GND  
+
C11  
C6  
ROUT–  
S3  
S4  
C8 R9  
HP/L*  
GND  
R7  
SE/BTL*  
C9 C10  
TPA0202 SAMPLE EVM  
Lit.# SLOP202  
R12  
U1  
S8  
R2  
R13  
D1  
S7  
C3 R4  
S2  
MUTE  
GND  
LIN  
C4 C5  
C1  
C2  
R1  
R3  
S1 LOUT–  
GND  
LHP  
+
GND  
C12  
LVDD  
R5  
LOUT+  
GND  
Single in-line header pins extend from the underside of the module circuit  
board to allow the EVM to be plugged into the TI Plug-N-Play Audio Amplifier  
Evaluation Platform, or to be wired directly into existing circuits and equipment  
when used stand-alone.  
The platform has room for a single TPA0202 evaluation module and is a  
convenient vehicle for demonstrating TI’s audio power amplifier and related  
evaluation modules. The EVMs simply plug into the platform, which  
automatically provides power to the modules, interconnects them correctly,  
andconnectsthemtoaversatilearrayofstandardaudioinputandoutputjacks  
and connectors. Easy-to-use configuration controls allow the platform and  
EVMs to quickly model many possible end-equipment configurations.  
There is nothing to build, nothing to solder, and nothing but the speakers  
included with the platform to “hook up.”  
1-3  
Introduction  
 
TPA0202 EVM Specifications  
1.3 TPA0202 EVM Specifications  
Supply voltage range, V  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 V to 5.5 V  
DD  
Supply current, I  
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 A max  
DD  
Continuous output power per channel, P : 4-BTL, V =5 V . . . . . . . . . . . . . . . . . . . . . . 2 W  
O
DD  
4-BTL, V =3.3 V . . . . . . . . . . . . . . . . 800 mW  
DD  
Audio input voltage, V : SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Vpp max  
I
BTL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.75 Vpp max  
Minimum load impedance, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Ω  
L
1-4  
Introduction  
 
Chapter 2  
Quick Start  
ThestepsinthischaptercanbefollowedtoquicklypreparetheTPA0202audio  
amplifier EVM for use. Using the TPA0202 with the TI Plug-N-Play Audio  
Amplifier Evaluation Platform is a quick and easy way to connect power, signal  
and control inputs, and signal outputs to the EVM using standard connectors.  
However, the audio amplifier evaluation module can be used stand-alone by  
making connections directly to the module pins, and can be wired directly into  
existing circuits or equipment.  
The platform switch and jumper settings shown in Table 2–1 are typical for the  
TPA0202 EVM and will cause the TPA0202 to switch to single-ended output  
mode when a plug is inserted into platform headphone jack J10.  
Table 2–1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA0202  
EVM  
JP6  
JP7  
JP8  
S2  
S3  
P-N-P Platform  
Mode  
X
Hi  
Note 2  
X
Notes: 1) X = Don’t care  
2) Set S2 to ON when signal conditioning board is installed in U1; set S2  
to OFF when no signal conditioning board is installed.  
Table 2–2. Typical TPA0202 EVM Jumper Settings  
EVM  
S1  
S3  
S4  
S5  
S6  
S8  
TPA0202  
ON  
OFF  
OFF  
ON  
ON  
OFF  
Note: S8 should remain OFF at all times.  
ON = shunt installed  
OFF = open  
Topic  
Page  
2.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2  
2.2 Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3  
2.3 Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5  
2-1  
 
Precautions  
2.1 Precautions  
Power Supply Input Polarity and Maximum Voltage  
Always ensure that the polarity and voltage of the external power  
connected to V  
power input connector J1, J2, and/or V  
power  
CC  
DD  
input connector J6 are correct. Overvoltage or reverse-polarity  
power applied to these terminals can open on-board soldered-in  
fuses and cause other damage to the platform, installed evaluation  
modules, and/or the power source.  
Inserting or Removing EVM Boards  
Do not insert or remove EVM boards with power applied — damage  
to the EVM board, the platform, or both may result.  
Figure 2–1. Quick Start Platform Map  
7b  
7b  
1
17  
7b  
ICC  
JP4  
C1+  
F1  
VR1  
DC  
Power  
In/Out  
7a  
Power  
Input  
7b  
R2  
R1  
Audio  
Power  
Amps  
Signal Conditioning  
Audio  
Input  
9
Speaker  
Output  
10  
5
Mode  
Mute  
Polarity  
Lo  
****CAUTION****  
Do not insert or remove  
EVM boards with power  
applied  
Hi  
Stereo  
Headphone  
Output  
Plug-N-Play Audio Amplifier  
Evaluation Platform  
SLOP097 Rev. C.1  
HP Out  
R3  
R4  
R5  
3
2
4
6
2-2  
Quick Start  
 
Quick Start List for Platform  
2.2 Quick Start List for Platform  
Follow these steps when using the TPA0202 EVM with the TI Plug-N-Play Au-  
dio Amplifier Evaluation Platform (see the platform user’s guide, SLOU011, for  
additional details). Numbered callouts for selected steps are shown in Figure  
2–1 and Figure 2–2, and details appear in Chapter 3.  
Platform preparations  
1) EnsurethatallexternalpowersourcesaresettoOFF andthattheplatform  
power switch S1 is set to OFF.  
2) Install a TPA0202 module in platform socket U2, taking care to align the  
module pins correctly.  
3) Use switch S2 to select or bypass the signal conditioning EVM (U1).  
4) Set control signal Polarity jumper JP8 to Hi.  
5) Set jumper JP6 to select the Mode control input (causes the TPA0202 to  
switch to the single-ended output mode if a plug is inserted into platform  
headphone jack J10).  
6) If the headphone Jack (J10) output will be used, set Hp source switch S3  
to U2U4.  
Table 2–3. Platform Jumper and Switch Settings for the TPA0202  
EVM  
P-N-P Platform  
Notes: 1) X = Don’t care  
JP6  
Mode  
JP7  
JP8  
Hi  
S2  
S3  
X
Note 2  
X
2) Set S2 to ON when signal conditioning board is installed in U1; set S2  
to OFF when no signal conditioning board is installed.  
Power supply  
7) Selectand connect the power supply (ensure power supply is set to OFF ):  
a) Connectanexternalregulatedpowersupplysetto5VtoplatformV  
DD  
power input connector J6 taking care to observe marked polarity,  
or  
b) Install a voltage regulator EVM (SLVP097 or equiv.) in platform socket  
U6. Connect a 7 V – 12 V power source to a platform V power input  
CC  
J1 or J2 and jumper the appropriate power input (see platform user’s  
guide).  
Inputs and outputs  
8) Ensure that the audio signal source level is set to minimum.  
9) Connect the audio source to left and right RCA phono jacks J3 and J5 or  
stereo miniature phone jack J4.  
10) Connect 3-– 8-speakers to left and right RCA jacks J7 and J9 or to  
stripped wire speaker connectors J8.  
2-3  
Quick Start  
 
Quick Start List for Platform  
Evaluation Module Preparations  
Figure 2–2. Module Preparation  
14  
12  
R11  
C7  
C6  
RVDD  
GND  
S5  
R10  
R8  
RHP  
GND  
RIN  
ROUT+  
GND  
+
C11  
S6  
ROUT–  
S3  
S4  
C8 R9  
15  
13  
HP/L*  
GND  
R7  
SE/BTL*  
C9 C10  
TPA0202 SAMPLE EVM  
Lit.# SLOP202  
R12  
16  
U1  
S8  
R2  
R13  
D1  
S7  
C3 R4  
S2  
MUTE  
GND  
LIN  
11  
C4 C5  
C1  
C2  
R1  
R3  
S1 LOUT–  
GND  
LHP  
+
GND  
C12  
LVDD  
R5  
LOUT+  
GND  
11) To have the module amplifier IC enter the shutdown mode when the  
module mute control input is activated, set shutdown jumper S1 to ON. To  
have the amplifier IC only mute when the module mute control input is  
activated, set shutdown jumper S1 to OFF.  
12) To select the line inputs, set input select jumper S3 to OFF. To select the  
headphone inputs, set input select jumper S3 to ON.  
13) To allow the module SE/BTL control input to switch the amplifier IC  
between single ended (SE) and bridge-tied load (BTL) output modes, set  
output mode jumper S4 to OFF. To keep the module amplifier IC in the  
single-ended output mode regardless of the control input state, set jumper  
S4 to ON.  
14) Set V  
bridge jumper S5 to either ON or OFF for normal operation.  
DD  
15) To automatically select the headphone inputs when the single-ended  
output mode is selected by the module SE/BTL control input, set  
autosense control jumper S6 to ON. To isolate the amplifier IC input select  
pin from the module output mode select control input, set autosense  
control jumper S6 to OFF.  
16) Set junction temperature measurement jumper S8 to OFF for normal  
operation.  
Table 2–4. Typical TPA0202 EVM Jumper Settings  
EVM  
S1  
S3  
S4  
S5  
S6  
S8  
TPA0202  
ON  
OFF  
OFF  
ON  
ON  
OFF  
Note: S8 should remain open at all times, ON = shunt installed, OFF = open  
Power Up  
17) Verify correct voltage and input polarity and set the external power supply  
to ON. If V and an on-board regulator EVM are used to provide V , set  
CC  
DD  
platform power switch S1 to ON.  
Platform LED2 should light indicating the presence of V , and the evaluation  
DD  
modules installed on the platform should begin operation.  
18) Adjust the signal source level as needed.  
2-4  
Quick Start  
 
Quick Start List for Stand-Alone  
2.3 Quick Start List for Stand-Alone  
Follow these steps to use the TPA0202 EVM stand-alone or when connecting  
it into existing circuits or equipment. Connections to the TPA0202 module  
header pins can be made via individual sockets, wire-wrapping, or soldering  
to the pins, either on the top or the bottom of the module circuit board.  
Numbered callouts for selected steps are shown in Figure 2–3 and details  
appear in Chapter 3.  
Figure 2–3. Quick Start Module Map  
9
7
R11  
S6  
C7  
C6  
RVDD  
GND  
S5  
R10  
R8  
RHP  
GND  
RIN  
ROUT+  
GND  
+
C11  
ROUT–  
S3  
S4  
C8 R9  
10  
8
HP/L*  
GND  
R7  
SE/BTL*  
C9 C10  
TPA0202 SAMPLE EVM  
Lit.# SLOP202  
R12  
11  
U1  
S8  
R2  
R13  
D1  
S7  
C3 R4  
S2  
MUTE  
GND  
LIN  
6
C4 C5  
C1  
C2  
R1  
R3  
S1 LOUT–  
GND  
LHP  
+
GND  
C12  
LVDD  
R5  
LOUT+  
GND  
Power supply  
1) Ensure that all external power sources are set to OFF.  
2) Connect an external regulated power supply set to 5 V to the module VDD  
and GND pins taking care to observe marked polarity. Separate right  
channel and left channel VDD supplies can be connected, or a single  
supply can be used for both.  
Inputs and outputs  
3) Ensure that audio signal source level adjustments are set to minimum.  
4) Connect the audio source to the module RIN/LIN and GND or RHP/LHP  
and GND pins of each channel taking care to observe marked polarity.  
5) Select output mode:  
a) For BTL output, connect an 3-– 8-speaker to the module OUT+  
OUT– pins of each channel,  
or  
b) For single-ended output, connect a headphone or an 3-– 8-Ω  
speaker to the module OUT+ and GND pins of each channel through  
a 33 µF to 1000 µF output-coupling capacitor (Figure 3–10).  
2-5  
Quick Start  
 
Quick Start List for Stand-Alone  
Evaluation Module Preparations  
6) To have the module amplifier IC enter the shutdown mode when the  
module mute control input is activated, set shutdown jumper S1 to ON. To  
have the amplifier IC only mute when the module mute control input is  
activated, set shutdown jumper S1 to OFF.  
7) To select the line inputs, set input select jumper S3 to OFF. To select the  
headphone inputs, set input select jumper S3 to ON.  
8) To allow the module SE/BTL control input to switch the amplifier IC  
between single ended (SE) and bridge-tied load (BTL) output modes, set  
output mode jumper S4 to OFF. To keep the module amplifier IC in the  
single-ended output mode regardless of the control input state, set jumper  
S4 to ON.  
9) Set V  
bridge jumper S5 to ON to connect the RVDD and LVDD module  
DD  
power input pins together, or to OFF to keep the two power inputs isolated  
on board  
10) To automatically select the headphone inputs when the single-ended  
output mode is selected by the module SE/BTL control input, set  
autosense control jumper S6 to ON. To isolate the amplifier IC input select  
pin from the module output mode select control input, set autosense  
control jumper S6 to OFF.  
11) Set junction temperature measurement jumper S8 to OFF for normal  
operation  
Control Inputs  
12) Connect control lines to the various module control input pins as needed:  
a) HP/L*: A high selects the headphone input pins; a low or float selects  
the line input pins.  
b) SE/BTL*: A high selects the single-ended output mode; a low or float  
selects the bridge-tied load output mode.  
c) MUTE: A high mutes the amplifier IC on the module; a low or float  
allows normal operation.  
Power-up  
13) Verify correct voltage and input polarity and set the external power supply  
to ON.  
The EVM should begin operation.  
14) Adjust the signal source level as needed.  
2-6  
Quick Start  
 
Chapter 3  
Details  
This chapter provides details on the TPA0202 IC, the evaluation module, and  
the steps in the Quick-Start List, additional application information, and a parts  
list for the TPA0202 evaluation module.  
Topic  
Page  
3.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2  
3.2 The TPA0202 Audio Power Amplifier Evaluation Module . . . . . . . . . 3–3  
3.3 Using the TPA0202 EVM With the Plug-N-Play  
Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7  
3.4 Using The TPA0202 EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . 3–16  
3.5 TPA0202 Audio Power Amplifier Evaluation Module Parts List . . 3–18  
3-1  
 
Precautions  
3.1 Precautions  
Power Supply Input Polarity and Maximum Voltage  
Always ensure that the polarity and voltage of the external power  
connected to V  
power input connector J1, J2, and/or V  
power  
CC  
DD  
input connector J6 are correct. Overvoltage or reverse-polarity  
power applied to these terminals can open on-board soldered-in  
fuses and cause other damage to the platform, installed evaluation  
modules, and/or the power source.  
Inserting or Removing EVM Boards  
Do not insert or remove EVM boards with power applied — damage  
to the EVM board, the platform, or both may result.  
Figure 3–1. The TI Plug-N-Play Audio Amplifier Evaluation Platform  
ICC  
JP4  
C1+  
F1  
VR1  
DC  
Power  
In/Out  
Power  
Input  
R2  
R1  
Audio  
Power  
Amps  
Signal Conditioning  
Audio  
Input  
Speaker  
Output  
Mode  
Mute  
Polarity  
Lo  
****CAUTION****  
Do not insert or remove  
EVM boards with power  
applied  
Hi  
Stereo  
Headphone  
Output  
Plug-N-Play Audio Amplifier  
Evaluation Platform  
SLOP097 Rev. C.1  
HP Out  
R3  
R4  
R5  
3-2  
Details  
 
The TPA0202 Audio Power Amplifier Evaluation Module  
3.2 The TPA0202 Audio Power Amplifier Evaluation Module  
The TPA0202 Audio Power Amplifier Evaluation Module is powered by a  
TPA0202 stereo power amplifier capable of delivering greater than 2 W of  
continuouspowerperchannelinto3-loads. TheamplifierICcanbeoperated  
in either the BTL or single-ended output mode. The evaluation module  
includes control inputs for muting and shutdown, selection between two sets  
of stereo inputs, and switching between single ended and bridge-tied load  
output modes.  
The module can be used with the TI Plug-N-Play Audio Amplifier Evaluation  
Platform (Figure 31) or wired directly into circuits or equipment. The module  
has single in-line header connector pins mounted to the under side of the  
board. These pins allow the module to be plugged into the TI platform, which  
automatically makes all the signal input and output, power, and control  
connections to the module.  
The module connection pins are on 0.1-inch centers to allow easy use with  
standard perf board and plug board-based prototyping systems. Or, the EVM  
can be wired directly into existing circuits and equipment when used stand-  
alone.  
The module appears in Figure 3–2 and its schematic is shown in Figure 33.  
Figure 3–2. TPA0202 EVM  
R11  
S6  
C7  
RVDD  
GND  
S5  
R10  
R8  
RHP  
GND  
RIN  
ROUT+  
GND  
+
C11  
C6  
ROUT–  
S3  
S4  
C8 R9  
HP/L*  
GND  
R7  
SE/BTL*  
C9 C10  
TPA0202 SAMPLE EVM  
Lit.# SLOP202  
R12  
U1  
S8  
R2  
R13  
D1  
S7  
C3 R4  
S2  
MUTE  
GND  
LIN  
C4 C5  
C1  
C2  
R1  
R3  
S1 LOUT–  
GND  
LHP  
+
GND  
C12  
LVDD  
R5  
LOUT+  
GND  
3-3  
Details  
 
The TPA0202 Audio Power Amplifier Evaluation Module  
Figure 3–3. TPA0202 EVM Schematic Diagram  
S8  
1
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
GND/HS  
GND/HS  
NC  
LOUT+  
ROUT+  
TPA0202  
2
3
C3  
C8  
NC  
5 pF  
5 pF  
LOUT+  
LLINE IN  
LHP IN  
LBYPASS  
ROUT+  
RLINE IN  
RHP IN  
RBYPASS  
C1  
1 µF  
C6  
1 µF  
R2  
50 kΩ  
R7  
50 kΩ  
R1  
20 kΩ  
R8  
20 kΩ  
4
LIN  
RIN  
R4  
R9  
5
20 kΩ  
20 kΩ  
LHP  
RHP  
R3  
20 kΩ  
R10  
20 kΩ  
C2  
1 µF  
C7  
1 µF  
6
C4  
C9  
2.2 µF  
2.2 µF  
S5  
7
LV  
DD  
LV  
DD  
RV  
DD  
RV  
DD  
LV  
DD  
C10  
C5  
2.2 µF  
C12  
10 µF  
8
C11  
SHUTDOWN  
MUTE OUT  
LOUT–  
NC  
HP/LINE  
ROUT–  
SE/BTL  
GND/HS  
2.2 µF 10 µF  
9
R5  
100 kΩ  
S3  
LV  
DD  
HP/LINE  
S1  
10  
11  
12  
LOUT–  
R11  
100 kΩ  
S6  
LV  
DD  
MUTE IN  
MUTE IN  
GND/HS  
S2  
ROUT–  
SE/BTL  
S4  
LV  
DD  
R6  
100 kΩ  
D1  
R12  
100 kΩ  
LV  
DD  
R13  
510 Ω  
S7  
3.2.1 TPA0202 Audio Amplifier IC  
The TPA0202 audio amplifier IC is a CMOS device intended primarily for  
bridge-tied load (BTL) operation in battery-powered applications. It is supplied  
in a very small 24-pin TSSOP thermal surface-mount package and has been  
designed to operate from low supply voltages (between approximately 3 V and  
5.5 V) and deliver full power at distortion levels of less than 0.1% THD+N from  
a 5-V supply (Figure 34). Typical applications include portable computers  
and multimedia systems.  
3-4  
Details  
 
The TPA0202 Audio Power Amplifier Evaluation Module  
Figure 3–4. TPA0202 Amplifier IC  
MUX  
MUX  
MUX  
SE/BTL  
The IC includes two separate amplifier channels, each of which can operate  
in either the bridged-tied load (BTL) mode or the single-ended mode as  
selected by the SE/BTL pin. In the BTL mode, the two output lines of each  
channel operate 180° out-of-phase with each other for increased power. The  
speaker load is connected directly across OUT+ and OUT–, and neither line  
is connected to ground. BTL operation provides many benefits, including  
quadruple the output power of single-ended operation and no need for bulky  
output coupling capacitors. In the single-ended mode, the speaker load is  
connected between the OUT+ terminal, through an output coupling capacitor,  
to system ground. For more information, see the TPA0202 amplifier IC data  
sheet, TI Literature Number SLOS205.  
3.2.2 Depop Circuitry  
The TPA0202 amplifier IC contains internal circuitry to minimize the various  
turn-on transients that might appear at the output during the transition from  
power off, shutdown, or mute to normal operation. Output turn-on transients  
can be virtually eliminated by sequencing the control inputs to the IC such that  
the TPA0202 amplifier is held in the single-ended output mode for a short time  
after the mute control pin is released (see paragraph 3.3.2.7).  
3.2.3 BTL Operation  
To operate in the bridge-tied load output mode, the module SE/BTL control  
input terminal must be held low. The module output signal from OUT+ must go  
throughthespeakerloadandbereturneddirectlytoOUT–, andNOTtosystem  
ground. This requires that the OUT– line be isolated not only from system  
ground, but also from the OUT– lines of any other amplifiers in the system. The  
platform provides such isolated output lines from the amplifier EVM sockets  
directly to separate left and right speaker connectors.  
3-5  
Details  
 
The TPA0202 Audio Power Amplifier Evaluation Module  
3.2.4 SIngle-Ended Operation  
For single-ended operation, the module SE/BTL control input pin must be held  
high. The speaker (or headphone) load is connected to the module OUT+  
output pin through a coupling capacitor, and to platform/system ground. A  
470-µF electrolytic coupling capacitor is provided on the platform in the signal  
path to the headphone output jack for this purpose, and a control signal from  
the platform headphone jack can be routed to the module control input pin to  
switch the TPA0202 IC to the single-ended mode.  
In the single-ended mode, the amplifiers inside the TPA0202 IC that drive the  
OUT– lines do not operate and do not dissipate any power. The OUT– pins go  
into a high-impedance state and can be left connected or allowed to float.  
3.2.5 Inputs and Gain  
Each channel has two separate signal inputs that are pin-selectable. They are  
called line (L) and headphone (HP). The line inputs are fixed at a gain of 10  
and the headphone inputs are fixed at a gain of –1. In the typical application  
in which the TPA0202 powers small speakers until headphones are plugged  
in, the difference in the gain selected for the two inputs provides approximately  
the same perceived listening level in the headphones as from the speakers.  
An input multiplexor in the amplifier IC selects between the two inputs  
according to the state of the HP/LINE IC pin.  
Gain for each input is determined by the ratio of the input resistor to the  
feedback resistor on the module PCB. And, although the input gains are fixed  
at the factory, they can be adjusted by changing the resistor values on the  
module PCB. However, care must be taken because the surface-mount solder  
pads on the PCB are somewhat fragile and will not survive many  
soldering/desoldering operations. In addition, the values selected for the  
gain-setting resistors affect the performance of the internal depop circuitry  
(see the TPA0202 data sheet).  
The TPA0202 amplifier IC, as most other amplifiers, exhibits its best distortion  
and noise performance at lower gain levels (see the TPA0202 data sheet).  
Evenso, theTPA0202atitshighestgainsettinghassignificantlylessdistortion  
than most low-cost speakers.  
Gain versus total harmonic distortion (THD) should be considered in each  
application. Both the module input signal level and the TPA0202 module gain  
should be adjusted to obtain the lowest overall distortion level for a particular  
overall gain. A quick rule of thumb (everything else being equal): the module  
input signal level should be as high as possible without clipping or overloading  
the TPA0202 input, and the TPA0202 gain should be kept as low as possible.  
3-6  
Details  
 
Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform  
3.3 Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform  
The TPA0202 Audio Amplifier Evaluation Module was designed to be used  
with the TI Plug-N-Play Audio Amplifier Evaluation Platform. It simply plugs  
into socket U2.  
The following paragraphs provide additional details for using the TPA0202  
EVM with the platform.  
3.3.1 Installing and Removing EVM Boards  
TI Plug-N-Play evaluation modules use single-in-line header pins installed on  
the underside of the module circuit board to plug into sockets on the platform.  
The EVM pins and the platform sockets are keyed such that only the correct  
type of EVM can be installed in a particular socket, and then only with the  
proper orientation.  
Evaluation modules are easily removed from the platform by simply prying  
them up and lifting them out of their sockets. Care must be taken, however, to  
prevent bending the pins.  
3.3.1.1 EVM Insertion  
1) Remove all power from the evaluation platform.  
2) Locate socket U2 on the platform.  
3) Orient the module correctly.  
4) Carefully align the pins of the module with the socket pin receptacles.  
5) Gently press the module into place.  
6) Check to be sure that all pins are seated properly and that none are bent  
over.  
3.3.1.2 EVM Removal  
1) Remove all power from the evaluation platform.  
2) Using an appropriate tool as a lever, gently pry up one side of the module  
a small amount.  
3) Change to the opposite side of the module and use the tool to pry that side  
up a small amount.  
4) Alternate between sides, prying the module up a little more each time to  
avoid bending the pins, until it comes loose from the socket.  
5) Lift the EVM off of the platform.  
3-7  
Details  
 
Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform  
3.3.2 TPA0202 Module Jumper Settings and Switches  
The TPA0202 EVM is equipped with several pushbutton SPST switches and  
jumpers that act as SPST switches to allow module operation to be modified  
to suit various requirements. In the following discussion, setting a jumper to  
ON means that a shunt is installed across the two pins of the jumper. Setting  
a jumper to OFF means that no shunt is installed on the jumper. See Figure  
3.5.  
In typical applications, some or all of the jumper functions are controlled by the  
system microcontroller or external logic.  
Figure 3–5. TPA0202 EVM Jumpers and Switches  
S8  
1
2
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
14  
13  
GND/HS  
GND/HS  
NC  
LOUT+  
ROUT+  
TPA0202  
C3  
5 pF  
C8  
5 pF  
NC  
3
LOUT+  
LLINE IN  
LHP IN  
LBYPASS  
ROUT+  
RLINE IN  
RHP IN  
RBYPASS  
C1  
1 µF  
C6  
1 µF  
R2  
50 kΩ  
R7  
50 kΩ  
R1  
20 kΩ  
R8  
20 kΩ  
4
LIN  
RIN  
R4  
20 kΩ  
R9  
20 kΩ  
5
LHP  
RHP  
R3  
20 kΩ  
R10  
20 kΩ  
C2  
1 µF  
C7  
1 µF  
6
C4  
C9  
2.2 µF  
2.2 µF  
S5  
7
LV  
DD  
LV  
DD  
RV  
DD  
RV  
DD  
LV  
DD  
C10  
C5  
2.2 µF  
C12  
10 µF  
8
C11  
2.2 µF 10 µF  
SHUTDOWN  
MUTE OUT  
LOUT–  
NC  
HP/LINE  
ROUT–  
SE/BTL  
GND/HS  
9
R5  
100 kΩ  
S3  
LV  
DD  
HP/LINE  
S1  
10  
11  
12  
LOUT–  
R11  
100 kΩ  
S6  
LV  
DD  
MUTE IN  
MUTE IN  
GND/HS  
S2  
ROUT–  
SE/BTL  
S4  
LV  
DD  
R6  
100 kΩ  
D1  
R12  
100 kΩ  
LV  
DD  
R13  
510 Ω  
S7  
3-8  
Details  
 
Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform  
3.3.2.1 S1 — Shutdown Jumper  
To have the module amplifier IC enter the shutdown mode when the module  
mute control input is activated, set shutdown jumper S1 to ON.  
The mute control output pin on the TPA0202 amplifier IC follows the mute  
control input pin and is buffered. Jumper S1 connects the mute output pin to  
the shutdown control input pin of the IC so that when S1 is ON, the IC is forced  
into shutdown mode instead of mute mode when the mute control input goes  
high. When S1 is OFF, a pulldown resistor on the module holds the IC  
shutdown control input pin low, keeping the IC out of the shutdown mode.  
The shutdown mode reduces IC current consumption to approximately 5 µA  
comparedtoapproximately1.5mAinthemutemode. Ittakeslonger, however,  
to resume normal operation from the shutdown mode (approx. 1 s to 2 s) than  
it takes to resume normal operation from the mute mode (approx. 100 ms to  
500 ms).  
3.3.2.2 S2 — Mute Switch  
Pushbutton switch S2 on the TPA0202 EVM allows manual muting of the  
amplifier IC.  
3.3.2.3 S3 — Input Select Jumper  
To select the line inputs, set input select jumper S3 to OFF. To select the  
headphone inputs, set input select jumper S3 to ON.  
The TPA0202 amplifier IC has two separate inputs for each channel. An  
internal multiplexor selects which input will be connected to the amplifier  
based on the state of the HP/LINE pin on the IC. However, the EVM HP/L*  
control input pin is not directly controlled by anything on the platform — the  
platform socket for that module pin is N/C. The amplifier IC HP/LINE control  
pin can be tied high manually via jumper S3 or connected to the amplifier IC  
SE/BTL control pin via jumper S6 so that it follows that control signal.  
For manual control, jumper S3 connects the HP/L* module control input pin to  
V
, so that when S3 is ON, the headphone inputs are selected. When S3 is  
DD  
OFF, a pulldown resistor on the module holds the IC shutdown control input  
pin low, selecting the line inputs.  
3.3.2.4 S4 — Output Mode Jumper  
To keep the module amplifier IC in the single-ended output mode regardless  
of the module control input state, set jumper S4 to ON.  
JumperS4connectstheSE/BTL output mode control input pin on the amplifier  
IC directly to V , so that when S4 is ON, the IC is held in the single-ended  
DD  
output mode regardless of the state of the SE/BTL* module control input.  
When S4 is OFF, a pulldown resistor on the module holds the IC output mode  
control input pin low, keeping the IC in the BTL output mode.  
3-9  
Details  
 
Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform  
3.3.2.5 S5 — VDD Bridge Jumper  
Jumper S5 connects the module LV  
power supply line to the RV  
power  
DD  
DD  
supply line. When the TPA0202 EVM is plugged into the platform, both VDD  
supplies are sourced from the same platform power bus, so the state of jumper  
S5 is irrelevant.  
If the EVM is used stand-alone, jumper S5 can be set to ON to simplify  
connection of the module to external power, or set to OFF to allow each  
amplifier channel to be powered from a separate supply.  
3.3.2.6 S6 — Autosense Jumper  
To automatically select the headphone inputs when the single-ended output  
mode is selected by the module SE/BTL* control input, set autosense control  
jumper S6 to ON.  
Jumper S6 connects the SE/BTL output mode select pin of the amplifier IC to  
the HP/LINE input select pin of the amplifier IC so that the HP input is selected  
automatically when the single-ended output mode is selected by the mode  
signal applied to the module SE/BTL* control input pin.  
Note that when autosense jumper S6 is set to ON, the headphone input and  
thesingle-endedoutputmodeareselected, andtheSE/BTL*controlsignalwill  
have no effect, if either jumper S3 or jumper S4 are set to ON.  
3.3.2.7 S7 — SE Output Mode Switch  
Pushbuttonswitch S7 on the TPA0202 EVM allows the manual selection of the  
single-ended output mode.  
When used in conjunction with mute switch S2, output thumps and pops that  
might occur when returning to normal operation from the mute mode can be  
eliminated by releasing mute switch S2 half a second before releasing the SE  
output mode switch S7 (see the TPA0202 data sheet for more information).  
In a typical application, this sequencing can be controlled by the system micro-  
controller or external logic.  
3.3.2.8 S8 — Junction Temperature Measurement Jumper  
Set junction temperature measurement jumper S8 to OFF for normal  
operation.  
The TPA0202 amplifier IC sources a current proportional to the device junction  
temperature that can be measured at the terminals of jumper S8 with an  
ammeter. This is not intended as a real-time measurement, but as an aid to  
the design and characterization of the PCB on which the IC is mounted. See  
the TPA0202 IC data sheet for additional information.  
3-10  
Details  
 
Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform  
3.3.3 Signal Routing  
Signal flow on the platform is controlled by two signal routing switches, as  
shown in Figure 35.  
Figure 3–6. Platform Signal Routing and Outputs  
Off  
+
R
R
L
R
U2  
TPA0202  
Amplifier EVM  
J7, J8, J9  
Speaker  
Outputs  
U1  
Signal  
Conditioning  
Audio  
Input  
S2  
+
L
L
On  
U2U4  
R
+
R
U5  
Stereo  
Headphone  
Amplifier  
J10  
Headphone  
Output  
GND  
S3  
L
+
L
U5  
3.3.3.1 Signal Conditioning  
The audio signal from the input jacks can be applied to the signal conditioning  
socket (U1) if an EVM is installed there, or socket U1 can be bypassed and the  
audio input signal applied directly to the inputs of the TPA0202.  
Switch S2 selects signal conditioning or bypasses it  
3.3.3.2 Headphone Output Jack  
Switch S3 is the source select for the stereo headphone output jack, J10. The  
headphone jack is capacitively coupled (via 470 µF electrolytics) and can  
output either the signal from the headphone amplifier in socket U5, or the  
signal from the TPA0202 power amplifier installed in socket U2, as determined  
by the setting of headphone source select switch S3.  
When S3 is set to the power amplifier position (U2 – U4), the headphone jack  
is connected to the TPA0202 power amplifier OUT+ output lines. When a plug  
is inserted into the jack, signals output through J10 are returned to platform  
ground, requiring single-ended power amplifier operation. A switch inside the  
headphone jack produces a control signal that can be routed to the power  
amplifier socket to shut down the TPA0202 EVM or switch it to single-ended  
output mode when a plug is inserted.  
Source select switch S3 connects the headphone jack to the output lines of  
either the headphone amplifier socket U5, or the power amplifier sockets  
(U2 – U4).  
To keep the TPA0202 amplifier outputs separated, set switchS3 to the  
headphone amplifier position (U5) and use the speaker outputs (J7,  
J8, and J9)  
To route the TPA0202 amplifier outputs to the headphone output jack  
(J10), set switch S3 to the power amplifier position (U2 – U4) — use  
this setting only if the TPA0202 EVM is to drive single-ended loads  
connected to J10  
3-11  
Details  
 
Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform  
3.3.4 Mute/Mode  
The TPA0202 EVM is equipped with a mute control input pin. When this input  
is tied to V , the TPA0202 amplifier IC on the module enters the mute mode  
DD  
and dissipates very little power. When the EVM control input is tied to GND or  
allowed to float, amplifier operation resumes.  
In typical applications, as often found in notebook computers, portable audio  
products, and such, the internal speakers mute when headphones are  
plugged into the headphone jack, or internal speakers mute when external  
speakers are connected. In applications using separate speaker and  
headphone amplifiers, the one not being used can be shut down (muted) to  
conserve power.  
A mode control input pin on the EVM switches the TPA0202 amplifier IC  
between the bridge-tied load (BTL) output mode and the single-ended (SE)  
outputmode. WhenthemodecontrolinputistiedtoGND, themoduleoperates  
in the BTL output mode. When this input is tied to V , the module operates  
DD  
in the single-ended output mode.  
In the typical application, output mode switching allows the TPA0202 to  
operate in the BTL output mode for increased power to internal speakers and  
then switch to single-ended mode to drive headphones when a plug is inserted  
into the headphone jack.  
3.3.4.1 Headphone Jack Control Signals  
The platform headphone output jack (J10) contains an internal switch that  
changesthestateofapairofcontrollineswhenaplugisinserted(Figure3–6).  
Each control line is pulled down by a 1-kresistor to ground (R4 and R5). The  
switch in the headphone jack pulls one line or the other up to V  
through a  
DD  
240-resistor (R3) depending on whether a plug is inserted in J10 or not.  
Figure 3–7. Mute/Mode and Polarity Control  
V
DD  
R3  
240 Ω  
Polarity  
JP8  
JP6  
Mode  
Mute  
Lo  
U2  
Power  
Amplifier  
J10  
Headphone  
Jack  
Hi  
R4  
1 kΩ  
R5  
1 kΩ  
SPK  
(U2–U4)  
3-12  
Details  
 
Using The TPA0202 EVM With the Plug-N-Play Evaluation Platform  
3.3.4.2 Mute/Mode Select (JP6)  
A 3-pin jumper header (JP6) on the platform, functioning as an SPDT switch,  
routes the control signal from the headphone jack to either the mute control  
input pin or the mode control input pin of the evaluation module.  
To mute the TPA0202 amplifier module using the control signal from  
the platform headphone jack, jumper JP6 to MUTE  
To switch the output mode of the TPA0202 amplifier between BTL and  
single-ended using the control signal from the platform headphone  
jack, jumper JP6 to MODE  
3.3.4.3 Mute/Mode Polarity Select (JP8)  
A second 3-pin jumper header (JP8) on the platform selects the control signal  
polarity by connecting either the active-high or the active-low line from the  
headphone jack to jumper JP6.  
When JP6 is set to Mute, use the following JP8 settings for the TPA0202:  
TomutetheTPA0202amplifiermodulewhenaplugisinsertedintothe  
headphone jack, jumper JP8 to Hi (this is the typical setting).  
To mute the TPA0202 amplifier module until a plug is inserted into the  
headphone jack, jumper JP8 to Lo.  
When JP6 is set to Mode, use the following JP8 settings for the TPA0202:  
To switch the TPA0202 amplifier module to the single-ended output  
mode when a plug is inserted into the headphone jack, jumper JP8 to  
Hi (this is the typical setting).  
ToswitchtheTPA0202amplifiermoduletotheBTLoutputmodewhen  
a plug is inserted into the headphone jack, jumper JP8 to Lo.  
3-13  
Details  
 
Power Requirements  
3.3.5 Power Requirements  
The TPA0202 Audio Power Amplifier Evaluation Module can operate from any  
voltagebetweenapproximately3Vand5.5V;however, theTPA0202amplifier  
IC on the module is characterized for operation at 3.3 V and 5 V. For best  
performance (highest output power with lowest distortion), the module should  
be operated at approximately 5 V unless there is a specific reason for  
operating it from a lower voltage.  
The TI Plug-N-Play Audio Amplifier Evaluation Platform with a voltage  
regulator EVM installed on it can provide a regulated V  
supply from a wide  
DD  
variety of unregulated V  
voltage inputs between approximately 5.5 V and  
CC  
12 V, including an on-board 9-V battery. Or, an external regulated power  
source can be used to supply V voltage to the platform and the TPA0202  
DD  
evaluation module installed on it.  
Although the TPA0202 amplifier IC draws approximately 1.25 A from the  
power supply during continuous full power output, peak current draw can be  
as high as 2 A. Any power supply connected to the platform should be capable  
of providing 2 A of current to avoid clipping of the output signal during peaks.  
Current consumption driving speakers at normal listening levels is typically  
0.5 A or less.  
The platform is equipped with overvoltage and reverse-polarity supply voltage  
input protection in the form of fused crowbar circuits.  
V
voltage applied to platform screw terminals J6 MUST NOT exceed  
DD  
the absolute maximum rating for the TPA0202 amplifier IC installed on the  
evaluation module (6 V) or damage to the IC may result. In no case should  
V
voltage of the incorrect polarity or in excess of 6.1 V be applied to  
DD  
screw terminals J6 of the platform, or the power protection circuit on the  
V
line will trip.  
DD  
V
voltage applied to the platform MUST NOT exceed the maximum  
CC  
voltage input specified for the voltage regulator module installed in socket  
U6 (12 V for the SLVP097), or damage to the voltage regulator module  
may result. In no case should V  
voltage applied to the platform exceed  
CC  
15 V, or the overvoltage protection circuit on the V  
bus will trip.  
CC  
3-14  
Details  
 
Inputs and Outputs  
3.3.6 Inputs and Outputs  
The TI Plug-N-Play Audio Amplifier Evaluation Platform is equipped with  
several standard conectors for audio inputs and outputs.  
3.3.6.1 Inputs  
In most cases, audio signals enter the platform through either a pair of RCA  
phono jacks (J3 and J5) or a miniature (1/8) stereo phone jack (J4). Certain  
signal conditioning and amplifier EVMs, however, may have additional signal  
input connectors mounted on the module circuit board.  
The platform audio signal input jacks (J3, J4, and J5) are of the closed-circuit  
type, grounding the signal input lines when no plugs are inserted.  
3.3.6.2 Outputs  
Amplified audio output signals leave the platform through left and right RCA  
phono jacks (J7 and J9), left and right pairs of compression connectors for  
stripped speaker wires (J8), and optionally, through a miniature (1/8) stereo  
phone jack (J10), for headphones.  
The audio output lines from the power amplifiers are separate all the way to  
the edge of the platform (output jacks J7, J8, and J9) — the OUT– lines from  
the power amplifier sockets are not tied to each other or to platform ground.  
This allows the TPA0202 power amplifier EVM to operate in the highly-efficient  
bridge-tied load configuration when driving speakers.  
The headphone jack (J10) is capacitively coupled to source select switch S3,  
which connects J10 to the output lines of either the headphone amplifier  
socket or the power amplifier sockets (Figure 35). When the TPA0202 output  
signal is routed to J10 by S3, signals output via J10 are returned to platform  
ground when a plug is inserted (Figure 37), requiring single-ended operation  
of the power amplifiers.  
Figure 3–8. Typical Headphone Plug  
Left  
Right  
GND  
3-15  
Details  
 
Using The TPA0202 EVM Stand-Alone  
3.4 Using The TPA0202 EVM Stand-Alone  
Using the TPA0202 Audio Power Amplifier Evaluation Module stand-alone is  
much the same as using it with the platform. The same 3-V to 5.5-V power  
supply range and the isolated OUT+ and OUT– lines for BTL operation  
requirement exists.  
Note that the mute signal applied to the EVM mute pin must be able to supply  
enough current to overcome the pulldown resistor on the module (100 k).  
3.4.1 TPA0202 EVM Connected for BTL Output  
Figure 3–9. TPA0202 EVM Connected for Stereo BTL Output  
5 V  
R11  
S6  
C7  
C6  
RVDD  
GND  
S5  
R10  
R8  
RHP  
GND  
RIN  
ROUT+  
GND  
+
Right  
Audio  
Input  
(Right)  
C11  
ROUT–  
S3  
S4  
C8 R9  
HP/L*  
GND  
R7  
SE/BTL*  
C9 C10  
5 V  
TPA0202 SAMPLE EVM  
Lit.# SLOP202  
R12  
U1  
External Mute  
S8  
R13  
D1  
S7  
Control  
R2  
(active high)  
C3 R4  
S2  
MUTE  
GND  
Audio  
Input  
(Left)  
C4 C5  
LIN  
C1  
C2  
R1  
R3  
S1 LOUT–  
GND  
LHP  
+
Left  
GND  
C12  
LVDD  
R5  
LOUT+  
GND  
5 V  
Table 3–1. Typical TPA0202 EVM Jumper Settings for BTL Stand-Alone  
EVM  
S1  
S3  
S4  
S5  
S6  
S8  
TPA0202  
X
OFF  
OFF  
ON  
X
OFF  
Note: ON = shunt installed, OFF = open, X = don’t care, S8 = always OFF  
3-16  
Details  
 
Using The TPA0202 EVM Stand-Alone  
3.4.2 TPA0202 EVM Connected for Single-Ended Output  
Figure 3–10. TPA0202 EVM Connected for Stereo Single-Ended Output  
5 V  
Audio  
Input  
(Right)  
R11  
S6  
C7  
C6  
RVDD  
GND  
S5  
R10  
R8  
RHP  
GND  
RIN  
ROUT+  
GND  
+
C11  
ROUT–  
+
S3  
S4  
33 µF –  
1000 µF  
C8 R9  
HP/L*  
GND  
R7  
5 V  
SE/BTL*  
C9 C10  
TPA0202 SAMPLE EVM  
Lit.# SLOP202  
R12  
U1  
S8  
R2  
R13  
D1  
S7  
33 µF –  
1000 µF  
C3 R4  
S2  
MUTE  
GND  
LIN  
C4 C5  
Mute  
+
C1  
C2  
R1  
R3  
S1 LOUT–  
Audio  
Input  
(Left)  
GND  
LHP  
+
GND  
C12  
LVDD  
R5  
LOUT+  
GND  
5 V  
Table 3–2. Typical TPA0202 EVM Jumper Settings for Single-Ended Stand-Alone  
EVM  
S1  
S3  
S4  
S5  
S6  
S8  
TPA0202  
X
ON  
ON  
ON  
X
OFF  
Note: ON = shunt installed, OFF = open, X = don’t care, S8 = always OFF  
3-17  
Details  
 
TPA0202 Audio Power Amplifier Evaluation Module Parts List  
3.5 TPA0202 Audio Power Amplifier Evaluation Module Parts List  
Table 3–1. TPA0202 EVM Parts List  
EVM  
Qty.  
Manufacturer/  
Part Number  
Ref.  
Description  
Size  
Digi-Key Number  
C1, C2,  
C6, C7  
Capacitor, 1 µF,  
1206  
4
4
2
2
6
Murata  
GRM42-6Y5V105Z16BL  
Newark  
93F2254  
80%/–20%, nonpolarized  
C4, C5,  
C9, C10  
Capacitor, 2.2 µF, 20%,  
nonpolarized  
1206  
0805  
A
TDK  
C3216X5R1A225  
C3, C8  
Capacitor, 5 pF  
Panasonic  
ECU-V1H050CCN  
Digi-Key  
PCC050CNCT-ND  
C11, C12 Capacitor, 10 µF, 6.3 V  
Panasonic  
ECS-TOJY106R  
Digi-Key  
PCS1106CT-ND  
R1, R2,  
R4, R8,  
R9, R10  
Resistor, 20 k, 1/8 W, 5%  
0805  
Panasonic  
ERJ-8GEYJ203V  
Digi-Key  
P20KKABK-ND  
R2, R7  
Resistor, 50 k, 1/8 W, 5%  
0805  
0805  
0805  
2
6
1
Panasonic  
ERJ-8GEYJ503V  
Digi-Key  
P50KKABK-ND  
R5, R6,  
R11, R12 5%  
Resistor, 100 k, 1/8 W,  
Panasonic  
ERJ-6GEYJ104V  
Digi-Key  
P100KABK-ND  
R13  
Resistor, 510 k, 1/8 W,  
5%  
Panasonic  
ERJ-6GEYJ510V  
Digi-Key  
P510KABK-ND  
D1  
Diode  
SMD  
SMD  
1
2
S2, S7  
Switch, momentary  
Panasonic  
Digi-Key  
P8048SCT-ND  
P8048SCT-ND  
S1,  
S3–S6,  
S8  
Header, 2 position  
Shunts  
2 mm  
2 mm  
6
Norcomp  
Digi-Key  
2163-02-ND  
P1, P3,  
P4  
3
1
1
3M  
Digi-Key  
953170-30-ND  
U1  
IC, TPA0202, audio  
amplifier, 2 W, 2 channel  
24 pin  
TSSOP  
TI  
TPA0202  
PCB1  
PCB, TPA0202 EVM  
TI SLOP202  
3-18  
Details  
 

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