
User's Guide
SLOU189A – March 2007 – Revised April 2007
TPA3120D2 Audio Power Amplifier EVM
Contents
1 Introduction .......................................................................................... 2
2 Operation ............................................................................................ 3
3 TPA3120D2 EVM Schematic ..................................................................... 4
4 TPA3120D2 EVM PCB Layers ................................................................... 5
5 TPA3120D2 Evaluation Module Parts List ...................................................... 7
List of Figures
1 TPA3120D2 Audio Power Amplifier EVM ....................................................... 2
2 TPA3120D2 EVM Schematic ..................................................................... 4
3 Top Side Layout .................................................................................... 5
4 Bottom Side Layout ................................................................................ 6
List of Tables
1 TPA3120D2 EVM Specifications ................................................................. 2
2 Gain Settings ........................................................................................ 3
3 TPA3120D2 EVM Bill of Materials................................................................ 7
SLOU189A – March 2007 – Revised April 2007 TPA3120D2 Audio Power Amplifier EVM 1
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Introduction
1 Introduction
The TPA3120D2 evaluation module consists of a single 25-W, class-D, stereo audio power amplifier
complete with a small number of external components mounted on a circuit board that can be used to
directly drive speakers with an external analog audio source as the input.
Table 1. TPA3120D2 EVM Specifications
VALUE UNIT
V
CC
I
CC
P
O
Z
L
Supply voltage range 10 to 30 V
Supply current, maximum 2 A
Continuous output power, PO: 4 Ω , V
Minimum load impedance 3.2 Ω
= 27 V, THD+N = 10% 24 W
CC
Figure 1. TPA3120D2 Audio Power Amplifier EVM
TPA3120D2 Audio Power Amplifier EVM2 SLOU189A – March 2007 – Revised April 2007
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2 Operation
2.1 Quick Start List for Stand-Alone Operation
Follow these steps to use the TPA3120D2EVM stand-alone or when connecting it into existing circuits or
equipment. Connections to the EVM module can be made by inserting stripped wire, or using banana
plugs for the power supply and output connections. The inputs accept standard RCA plugs.
2.1.1 Power Supply
1. Ensure that all external power sources are set to OFF.
2. Connect an external regulated power supply adjusted from 10 V to 30 V to the module VCC (J7) and
GND (J8) banana jacks taking care to observe marked polarity.
2.1.2 Evaluation Module Preparations
Inputs and Outputs:
1. Connect an audio source to the input jacks, J9 and J10.
2. Connect a speaker across GND (J5) and +ROUT (J6). Connect another speaker across LOUT (J3)
and GND (J4)
3. Install both gain jumpers GAIN0 (J1) and GAIN1 (J2). This sets the gain of the amplifier to the lowest
level, 20 dB.
Control Inputs:
1. SHUTDOWN: This terminal is active LOW. A LOW on the device terminal (<0.8 V) shuts down the
amplifier; a HIGH (>2 V) on the device terminal places the amplifier in the active state. Holding down
switch SW1 places the amplifier in the SHUTDOWN state. Releasing SW1 returns the amplifier to the
active state. This terminal is V
2. MUTE: This terminal is active HIGH. A HIGH (>2 V) on this terminal will immediately terminate audio
playback through the speakers; a LOW (<0.8 V) enables the device. The outputs remain switching with
fifty percent duty cycle. SW2 on the EVM controls the state of the MUTE terminal. Holding down switch
SW2 places the amplifier in the MUTE state. Releasing SW2 returns the amplifier to the active state.
This terminal is V
3. GAIN0/GAIN1: Together, these terminals determine the gain of the amplifier. See Table 2 . Installing a
jumper in J1 or J2 sets the respective terminal to GND. Removing the jumper sets the respective
terminals to VCC. Removing jumpers increases the gain while installing jumpers decreases the gain.
Logic levels are TTL compatible. These terminals are V
4. Power-off Depop Circuit: Additional circuitry to quiet power-off pop has been provided on the EVM.
This circuit consists of shunt regulator D1, bipolar transistor Q4, and the surrounding components. This
circuit is activated by installing the jumper J11 which connects Vcc to the network. The depop circuit
has two different modes of operation. When R13 is installed, this circuit slowly pulls down the voltage
on the Bypass pin when power is removed resulting in a controlled reduction of the Class D output
duty cycle. If R17 is installed, the network reduces the pop by pulling down the shutdown pin at
power-off. This approach can be used if the power supply operates in such a way that there is a
significant time delay between removal of power and the point where Vcc falls below the chip UVLO
level, which is approximately 8 volts.
compliant.
CC
Operation
compliant.
CC
compliant.
CC
GAIN0 (J1) GAIN1 (J2) Amplifier Gain (dB)
ON ON 20
ON OFF 26
OFF ON 32
OFF OFF 36
SLOU189A – March 2007 – Revised April 2007 TPA3120D2 Audio Power Amplifier EVM 3
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Table 2. Gain Settings

RIGHT_OUT
LEFT_IN
RIGHT_IN
LEFT_OUT
VCC
VCC
VCC
VCC
VCC
VCC
C9open
C16open
Circuitinsidedottedlineis
forpowerdownde-pop
improvement.
R3
10KR310K
J4
-LOUTJ4-LOUT
TP4TP4
SW1
SHUTDOWN
SW1
SHUTDOWN
U1
TPA3120U1TPA3120
PVCCL
1
SD
2
PVCCL
3
MUTE
4
LIN
5
RIN
6
BYPASS
7
AGND
8
AGND
9
PVCCR
10
VCLAMP
11
PVCCR
12
PGNDR
13
PGNDR
14
ROUT
15
BSR
16
GAIN1
17
GAIN0
18
AVCC
19
AVCC
20
BSL
21
LOUT
22
PGNDL
23
PGNDL
24
THERMAL
2
5
C14
0.1uF
C14
0.1uF
TP5TP5
R6
4.75KR64.75K
L2
22uHL222uH
J7
VCCJ7VCC
R12
10K
R12
10K
C6
1.0uFC61.0uF
R90R9
0
D2
Dl4148
R4
10KR410K
C18
0.01uF
C18
0.01uF
R17 open10R17 open
10
TP12
RGND
TP12
RGND
SW2
MUTE
SW2
MUTE
TP3TP3
C12 0.22uFC12 0.22uF C9
1.0uFC91.0uF
R16
20K
R16
20K
R7
4.75KR74.75K
+
C8
470uF
+
C8
470uF
1
2
J8
GNDJ8GND
TP2TP2
J10
RIN
J10
RIN
2
3
1
R8
4.75KR84.75K
J9
LINJ9LIN
2
3
1
R18
10K
R18
10K
+
C10
470uF
+
C10
470uF
1 2
J11J11
1
2
TP10
GND
TP10
GND
C16
1.0uF
C16
1.0uF
R1
10KR110K
C15 0.22uFC15 0.22uF
R13
150K
R13
150K
TP7
RIGH
T_OUT
TP7
RIGH
T_OUT
J5
-ROUTJ5-ROUT
J1
GAIN0J1GAIN0
1
2
+
C17
470uF
+
C17
470uF
1 2
C3
1.0uFC31.0uF
R15open1MR15open
1M
J3
+LOUTJ3+LOUT
TP11
LGND
TP11
LGND
TP1
LEFT_IN
TP1
LEFT_IN
C19
0.68u
F
C19
0.68u
F
R2
10KR210K
C
E
B
Q4
MMBT3904
C
E
B
Q4
MMBT3904
1
2
3
+
C2
470uF
+
C2
470uF
1
2
J6
+ROUTJ6+ROUT
R100R10
0
C11open
10pF
C11open
10pF
10pF
C21open
10pF
C13
10uF
C13
10uF
C4
1.0uFC41.0uF
J2
GAIN1J2GAIN1
1
2
C7 0.1uFC7 0.1uF
C20
0.68u
F
C20
0.68u
F
TP6
LEFT_OUT
TP6
LEFT_OUT
R11
2.49K
R11
2.49K
10K
R19
10K
D1
TLV431ACDBZR
D1
TLV431ACDBZR
3
2
1
C1 0.1uFC1 0.1uF
TP9
INPUT_GND
TP9
INPUT_GND
TP8
RIGHT_IN
TP8
RIGHT_IN
L1
22uHL122uH
C5
1.0uFC51.0uF
TPA3120D2 EVM Schematic
2.1.3 Power Up
1. Verify correct voltage and input polarity, and turn the external power supplies ON.
The EVM should begin operation.
1. Adjust the input signal.
2. Adjust the control inputs to the desired settings.
3. Adjust the amplifier gain by installing/removing the gain jumpers, J1 and J2.
3 TPA3120D2 EVM Schematic
Figure 2. TPA3120D2 EVM Schematic
TPA3120D2 Audio Power Amplifier EVM4 SLOU189A – March 2007 – Revised April 2007
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4 TPA3120D2 EVM PCB Layers
The following illustrations depict the TPA3120D2 EVM PCB layers.
TPA3120D2 EVM PCB Layers
SLOU189A – March 2007 – Revised April 2007 TPA3120D2 Audio Power Amplifier EVM 5
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Figure 3. Top Side Layout

TPA3120D2 EVM PCB Layers
Figure 4. Bottom Side Layout
TPA3120D2 Audio Power Amplifier EVM6 SLOU189A – March 2007 – Revised April 2007
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5 TPA3120D2 Evaluation Module Parts List
Table 3. TPA3120D2 EVM Bill of Materials
Reference Description Size Qty Status Manufacturer Part
C1, C7, C14 0603 3 TDK C1608X7R1H104KT
C2, C8, C10,
C17
C3, C4, C5, Capacitor, ceramic, 1.0uF, +/-10%, X7R,
C6 16V
C9, C16 0805 2 open TDK C3216X7R1H105K
C12, C15 0603 2 TDK C1608X7R1C224KT
C13 1210 1 Murata GRM32DF51H106ZA01L
C19, C20 Capacitor, metal poly, 0.68uF, 63V Radial 2 EPCOS, inc. B32529C684J
L1-L2 Radial 2 Toko A7503AY-220M
R1-R4 Resistor, chip, 10 kohm, 1/16 W, 5% 0603 4 Panasonic ERA-V15J103V
R6, R7 Resistor, chip, 4.7 kohm, 1/10 W, 5% 0603 2 Panasonic ERJ-3GEYJ472V
R9, R10 Resistor, chip, zero ohm, 1/10 W, 5% 0603 2 Panasonic ERJ-3GEY0R00V
J1-J2 Phono Jack, PC mount, switched 2 Switchcraft PJRAN1X1U03
J3-J8 6 Johnson 111-2223-001
J9-J10 Header, 2 position, Male 2mm 2 Norcomp 2163-36-01-P2
JP9-JP10
(shunts)
SW1, SW2 2 Panasonic EVQ-PPBA25
U1 TPA3120D2PWP 1 TI TPA3120D2PWP
The following parts comprise the power-off depop circuit which is enabled by installing J11.
C11, C21 0603 2 open Murata GRM1885C2A100RA01D
C18 0603 1 TDK C1608X7R1H103K
D1 Shunt Regulator, Adjustable SOT-23-3 1 Texas Instruments TLV431ACDBZR
D2 Rectifier, Silicon, 0.15 A, 75V mini MELF 1 Micro Commercial DL4148-TP
Q4 Transistor, NPN, AMP SOT-23 1 Fairchild Semiconductor MMBT3904
R8 Resistor, chip, 4.7 kohm, 1/10 W, 5% 0603 1 Panasonic ERJ-3GEYJ472V
R11 Resisitor, chip, 2.49 kohm, 1/10 W, 1% 0603 1 Vishay CRCW06032K49FKEA
R12, R18, R19 Resistor, chip, 10 kohm, 1/16 W, 5% 0603 3 Panasonic ERA-V15J103V
R13 Resistor, chip, 150 kohm, 1/10 W, 1% 0603 1 Vishay CRCW0603150KJNEA
R15 Resistor, chip, 1 Megohm, 1/10 W, 1% 0603 1 open Vishay CRCW06031M00FKEA
R16 Resistor, chip, 20 kohm, 1/10 W, 1% 0603 1 Vishay CRCW060320K0FKEA
R17 Resistor, chip, 10 ohm, 1/16 W, 1% 0603 1 open Vishay CRCW060310R0FKEA
J11 Header, 2 position, Male 2mm 1 open Norcomp 2163-36-01-P2
Capacitor, ceramic, 0.1uF, +/-10%, X7R,
50V
Capacitor, Electrolytic, 470uF, 35 V Radial 4 Nichicon UHE1V471MH06
Capacitor, ceramic, 1.0uF, +/-10%, X7R,
50V
Capacitor, ceramic, 0.22uF, +/-10%, X7R,
16V
Capacitor, ceramic, 10uF, +80%/–20%,
Y5V, 50V
Inductor, 22uH, radial lead, ferrite
material, shielded
Banana Jack w/knurled Thumbnut (nickel
plate)
SHUNT, 2MM 2mm 2 Specialty 2JM-G
SWITCH, MOMENTARY, SMD, LOW
PROFILE
Standoffs, 5/8" length, 4-40 thread 4 Keystone 1808
Screws, 4-40, .375 4
Capacitor, ceramic, 10 pf, +/-10%, C0G,
100V
Capacitor, ceramic, 0.01 uF, +/-10%, X7R,
50V
TPA3120D2 Evaluation Module Parts List
Number
0603 4 Taiyo Yuden EMK107BJ105KA-TR
24 pin
TSSOP
SLOU189A – March 2007 – Revised April 2007 TPA3120D2 Audio Power Amplifier EVM 7
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 10 V to 30 V and the output voltage range of 0 V to 30 V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load
specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 85 ° C. The EVM is designed to
operate properly with certain components above 85 ° C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.
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