Texas Instruments TPA3120D2 User Manual

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

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RIGHT_OUT

LEFT_IN
RIGHT_IN

LEFT_OUT

VCC

VCC

VCC

VCC

VCC

VCC

C9open

C16open

Circuitinsidedottedlineis
forpowerdownde-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

R15open1MR15open

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

C11open

10pF

C11open

10pF

10pF

C21open

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

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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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Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION

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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
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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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