User’s Guide
September 2000
Mixed-Signal Products
SLOU082
Preface
Related Documentation From Texas Instruments
TI Plug-N-Play Audio Amplifier Evaluation Platform (TI Literature
Number SLOU011) provides detailed information on the evaluation
platform and its use with TI audio evaluation modules.
TPA032D03 CLASS-D AUDIO POWER AMPLIFIER (TI Literature
Number SLOS283) This is the data sheet for the TPA032D03
audio amplifier integrated circuit.
Design Considerations for Class-D Audio Power Amplifiers,
(TI Literature Number SLOA031) This application report provides
detailed information on designing audio power amplifier systems
using TI class-D amplifier ICs
Reducing and Eliminating the Class-D Output Filter,
(TI Literature Number SLOA023) This application report covers
output filter theory and design for class-D audio power amplifiers.
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
PowerPAD is a trademark of Texas Instruments.
iii
iv
Contents
1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1
1.2
1.3
Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
TPA032D03 Class-D EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.3.1 Maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.3.2 Typical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2
3
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1
3.2
3.3
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Plug-N-Play Platform Power Requirements and Connections . . . . . . . . . . . . . . . . . . . . . 3-3
Plug-N-Play Platform Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.3.1 Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.3.2 Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Control and Indicator Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
TPA032D03 Class-D EVM Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.6.1 S1 — Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.6.2 S2 — Mute Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Using The TPA032D03 Class-D EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.7.1 Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.7.2 Input Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.7.3 Output Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.7.4 Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
TPA032D03 Class-D EVM Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
TPA032D03 Class-D EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.4
3.5
3.6
3.7
3.8
3.9
3.10 TPA032D03 Class-D EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
v
Figures
1–1
1–2
2–1
3–1
3–2
3–3
3–4
3–5
3–6
3–7
3–8
3–9
The TI TPA032D03 Mono Class-D Audio Power Amplifier EVM — Top View . . . . . . . . . . 1-3
The TI TPA032D03 Mono Class-D Audio Power Amplifier EVM — Bottom View . . . . . . . 1-3
Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
The TI Plug-N-Play Audio Amplifier Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Typical Headphone Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
TPA032D03 Class-D EVM Stand-Alone Connections for Mono BTL Output . . . . . . . . . . . 3-7
TPA032D03 Class-D EVM Schematic Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
TPA032D03 Class-D EVM Top Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
TPA032D03 Class-D EVM Bottom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
TPA032D03 Class-D EVM Top Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
TPA032D03 Class-D EVM Second Layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
TPA032D03 Class-D EVM Third Layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
3–10 TPA032D03 Class-D EVM Bottom Layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Tables
2–1
Typical TI Plug-N-Play Platform Jumper and Switch Settings for the
TPA032D03 Class-D EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2–2
3–1
3–2
3–3
3–4
Platform Jumper and Switch Settings for the TPA032D03 . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Platform Jumper and Switch Settings for the TPA032D03 EVM Power Inputs . . . . . . . . . 3-3
TPA032D03 Class-D EVM Fault Indicator Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
TPA032D03 Class-D EVM Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
TPA032D03 Class-D EVM Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
vi
Chapter 1
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA032D03
mono class-D audio power amplifier evaluation module (SLOP310). 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 TPA032D03 Class-D EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . 1–4
1-1
Feature Highlights
1.1 Feature Highlights
The TI TPA032D03 mono class-D audio power amplifier evaluation module
and the TI plug-n-play audio amplifier evaluation platform include the following
features:
TPA032D03 Mono Class-D Audio Power Amplifier with Stereo Head-
phone Amplifier Evaluation Module
Internal depop circuitry to greatly reduce turn-on transients in outputs
Single channel, class D bridge-tied load (BTL) only operation
12 V operation
10 W BTL output into 4 Ω at 12 V
Low current consumption in shutdown/mute mode (20 µA/10 mA) ??
Internal gain set to 25 dB
IC shutdown, mute, and mode control inputs — TTL logic level
High efficiency
Class AB stereo headphone driver — capable of 50 mW into 32 Ω
Onboard stereo headphone output jack
CE tested and approved.
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 V
supply inputs
CC
External regulated V
supply input
DD
Socket for onboard 5 V/3.3 V V
voltage regulator EVM
DD
Onboard 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 TPA032D03 mono class-D audio power amplifier evaluation module is a
complete, 10-W mono audio power amplifier. It consists of the TI TPA032D03
mono class-D 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 and 1–2).
Figure 1–1. The TI TPA032D03 Mono Class-D Audio Power Amplifier EVM — Top View
SLOP310
TPA032D03 EVM Board
VCC
GND
C1
R4
Mute
SD
S1
Mute
S2
SD
C3
C4
OUT–
R2
C2
OUT+
VDD GND
VCC
Note: Capacitor C11 is optional (not assembled) and a location for it on the EVM PCB has been provided to increase design
flexibility and allow decoupling capacitance to be added.
Figure 1–2. The TI TPA032D03 Mono Class-D Audio Power Amplifier EVM — Bottom View
1-3
Introduction
TPA032D03 Class-D EVM Specifications
Single in-line header pins extend from the underside of the module circuit
board to allow the EVM to either 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.
TheplatformhasroomforasingleTPA032D03class-Devaluationmoduleand
is a convenient vehicle for demonstrating TI’s audio power amplifier and
related evaluation modules. The EVM simply plugs 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 TPA032D03 Class-D EVM Specifications
AllmeasurementsmadewithV =12VandR =4Ω, unlessotherwisenoted.
DD
L
1.3.1 Maximum
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 V to 14 V
DD
Supply current, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.6 A
DD
Continuous output power per channel, BTL, P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 W
O
Continuous output power per channel, headphones, P 32-Ω SE . . . . . . . . . . . . . . . . . . 50 mW
O:
Audio input voltage, class-D, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350 mVrms
I
Audio input voltage, headphone, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 Vrms
I
1.3.2 Typical
Supply current, no input, class-D active, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 mA
DD
Supply current, no input, headphone active, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 mA
DD
Supply current, EVM mute, class-D active, I
DD
Supply current, EVM mute, headphone active, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 mA
DD
Supply current, EVM shutdown, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 µA
DD
Gain, class-D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 dB
Gain, headphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 dB
Crosstalk, headphone, P = 30 mW @ 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –70 dB
O
Total harmonic distortion + noise, class-D, P = 1 W @ 1 kHz . . . . . . . . . . . . . . . . . . . . . . 0.14 %
O
Total harmonic distortion + noise, headphone, P = 30 mW @ 1 kHz . . . . . . . . . . . . . . . . . 0.3 %
O
1-4
Introduction
Chapter 2
Quick Start
Follow the steps in this chapter to quickly prepare the TPA032D03 mono
class-D audio amplifier EVM for use. Using the TPA032D03 class-D EVM 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 it can be wired directly into existing circuits or equipment.
The platform switch and jumper settings shown in Table 2–1 are typical for the
TPA032D03 class-D EVM. There are no jumpers or switches to set on
the TPA032D03 class-D EVM board, itself.
Table 2–1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the
TPA032D03 Class-D EVM
POWER TYPE (Note 2)
VCC (J1)
JP1
ON
JP2
OFF
ON
JP3
OFF
OFF
JP4
ON
ON
JP5
ON
ON
JP6
Mute
Mute
JP7
X
JP8
Lo
S1
ON
ON
S2 (Note 3)
OFF
S3
U5
U5
AC/DC (J2)
OFF
X
Lo
OFF
Notes: 1) ON = Jumper installed, OFF = Jumper NOT Installed, X = Don’t care
2) Install a voltage regulator EVM (SLVP097) in platform socket U6 for VDD power to EVM control inputs.
3) Set to ON when Tone Control Board SLOP109 is installed in U1, otherwise set to OFF.
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 onboard 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
8
1
9
11
10
ICC
JP4
C1+
F1
VR1
DC
Power
In/Out
7
Power
Input
R2
R1
Audio
Power
Amps
Signal Conditioning
12
Audio
Input
13
17
Speaker
Output
14
Mode
Mute
Polarity
Lo
****CAUTION****
Do not insert or remove
EVM boards with power
applied
5
Hi
Stereo
Headphone
Output
Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
R3
R4
HP Out
R5
3
16
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 TPA032D03 class-D EVM with the TI
plug-n-play audio 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 details appear in Chapter 3.
Platform Preparations
1) Ensure that all external power sources and platform power switch S1 are
set to OFF.
2) Install a TPA032D03 module in platform socket U2, taking care to align the
module pins correctly (EVM power pins engage sockets U2 and U3).
3) Set switch S2 to OFF.
4) Set switch S3 to U5.
5) Set jumper JP6 to select the Mute control input.
6) Set control signal Polarity jumper JP8 to Lo.
Table 2–2. Platform Jumper and Switch Settings for the TPA032D03
POWER TYPE (Note 2)
JP1
JP4
JP5
JP6
JP7
JP8
S1
S2 (Note3)
S3
VCC (J1)
ON
ON
ON
Mute
X
Lo
ON
OFF
U5
Notes: 1) ON = Jumper installed, OFF = Jumper NOT Installed, X = Don’t care
2) Install a voltage regulator EVM (SLVP097) in platform socket U6 for VDD power to EVM control inputs.
3) Set to ON Tone Control Board SLOP109 is installed in U1.
Power supply
7) Connect a 12-V regulated power supply (ensure power supply is set to
OFF ) to J1, taking care to observe marked polarity.
8) Set jumper JP1 for dc source to be from input J1.
9) Set jumper JP4 for VCC power to EVMs.
10) Install a voltage regulator EVM (SLVP097) in platform socket U6.
11) Set jumper JP5 for VDD power to EVMs.
Inputs and outputs
12) Ensure that the audio signal source level is set to minimum.
13) Connect the audio source to left and right RCA phono jacks J3 and J5 or
mono miniature phone jack J4.
14) Connect4-Ω –8-Ω speakerstoleftRCAjackJ9ortostrippedwirespeaker
connectors J8.
Power up
15) Verify correct voltage and input polarity and set the external power supply
and platform power switch S1 to ON.
Platform LED1 and LED2 should light indicating the presence of VCC and
VDD, and the evaluation module(s) installed on the platform should begin
operation.
16) Set switch S2 to ON if tone control board SLOP109 is installed in U1.
17) Adjust the signal source level as needed.
2-3
Quick Start
Quick Start List for Stand-Alone
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA032D03 class-D EVM stand-alone or to
connect it into existing circuits or equipment. Connections to the TPA032D03
module header pins can be made via individual sockets, wire-wrapping, or
solderingtothepins, eitheronthetoporthebottomofthemodulecircuitboard.
Power supply
1) Ensure that all external power sources are set to OFF.
2) Connect an external regulated power supply set to 12 V to the module
VCC and GND pins taking care to observe marked polarity. It is only
necessary to use the ground pins adjacent to the module power pins.
3) Connect an external regulated power supply set to 5 V to the module VDD
pin taking care to observe marked polarity.
Inputs and outputs
4) Ensure that audio signal source level adjustments are set to minimum.
5) Connect the audio source across the module IN+ and IN– pins for class-D
operation, taking care to observe marked polarity. For single-ended input,
thenegativeinputpin(IN–)shouldbeconnectedtothegroundoftheaudio
signal source.
6) Connect a control signal to the module Mute pin, if necessary. The control
signal should be high (2 V to 5 V or left floating) for normal operation, or
low (tied to ground) to mute the output.
7) Connect a control signal to the module SD pin, if necessary. The control
signal should be high (2 V to 5 V or left floating) for normal operation, or
low (tied to ground) to shut down the TPA032D03 amplifier IC on the EVM.
NotethatthecontrolsignalsappliedtotheEVMMuteandSDinputsmusthave
sufficient current capability to overcome the 100-kΩ pullup resistor on each
input. Miniature pushbutton switches on the EVM allow manual shutdown (S2)
and manual muting (S1) of the amplifier.
8) Connect a 4-Ω – 8-Ω speaker to the module OUT+ and OUT– pins, taking
care to observe marked polarity.
Power up
9) Verify correct voltage and input polarity and set the external power supply
to ON.
The EVM should begin operation.
10) Adjust the signal source level as needed.
2-4
Quick Start
Chapter 3
Details
This chapter provides details on the TPA032D03ICevaluation module, a parts
list for the TPA032D03 class-D evaluation module, and module PCB layer
illustrations.
Topic
Page
3.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2 Plug-N-Play Platform Power Requirements and Connections . . . . . 3-3
3.3 Plug-N-Play Platform Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.4 Control and Indicator Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.5 TPA032D03 Class-D EVM Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.6 Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.7 Using The TPA032D03 Class-D EVM Stand-Alone . . . . . . . . . . . . . . . . 3-7
3.8 TPA032D03 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.9 TPA032D03 Class-D EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.10 TPA032D03 Class-D EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
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 onboard 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
R3
R4
HP Out
R5
3-2
Details
Plug-N-Play Platform Power Requirements and Connections
3.2 Plug-N-Play Platform Power Requirements and Connections
The TPA032D03 mono class-D audio power amplifier evaluation module is
designed to operate from a supply voltage between 9 V and 14 V. For best
performance, the module should be operated at 12 V.
The TI plug-n-play audio amplifier evaluation platform provides several
options for powering the TPA032D03 class-D EVM. Table 3–1 shows the
platform jumper and switch settings for each power source option (see the
User’s Guide for the TI plug-n-play audio amplifier platform, TI Literature
Number SLOU011 for more information). The TPA032D03 class-D EVM
requires no setup for power source selection.
Table 3–1.Platform Jumper and Switch Settings for the TPA032D03 EVM Power Inputs
POWER TYPE (Note 2)
VCC (J1)
JP1
ON
JP2
OFF
ON
JP3
OFF
OFF
JP4
ON
ON
JP5
ON
ON
JP6
Mute
Mute
JP7
X
JP8
Lo
S1
ON
ON
S2 (Note 3)
OFF
S3
U5
U5
AC/DC (J2)
OFF
X
Lo
OFF
Notes: 1) ON = Jumper installed, OFF = Jumper NOT Installed, X = Don’t care
2) Install a voltage regulator EVM (SLVP097) in platform socket U6 for VDD power to EVM control inputs.
3) Set to ON when Tone Control Board SLOP109 is installed in U1, otherwise set to OFF.
Although the TPA032D03 amplifier IC draws approximately 1.6 A from the
power supply during continuous full power output, peak current draw can be
as high as 2.3 A. Any power supply connected to the platform should be
capable of providing 2.3 A (peak) to avoid clipping of the output signal during
voltage peaks. Current consumption driving speakers at normal listening
levels is typically 0.1 A or less.
A V
supply of 5 V is required for normal operation of the TPA032D03 EVM.
DD
V
can either be applied to the platform V
power input terminals (J6) or a
DD
DD
voltage regulator (SLVP097 or equiv.) can be installed in platform socket U6
to provide V from the platform V supply.
DD
CC
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 TPA032D03 amplifier IC installed on
the evaluation module (5.5 V) or damage to the IC may result. In no case
shouldV voltageoftheincorrectpolarityorinexcessof6.0Vbeapplied
DD
to 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
3-3
Details
Plug-N-Play Platform Inputs and Outputs
3.3 Plug-N-Play Platform Inputs and Outputs
The TI plug-n-play audio amplifier evaluation platform is equipped with several
standard conectors for audio inputs and outputs.
3.3.1 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″) mono 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.
3.3.2 Outputs
Amplified audio output signals leave the platform through the left RCA phono
jack(J9)andtheleftpairofcompressionconnectorsforstrippedspeakerwires
(J8).
The audio output lines from the power amplifiers are separate all the way to
the edge of the platform (output jacks J8 and J9) — the OUT+ and OUT– lines
from the power amplifier sockets are not tied to each other or to platform
ground. This allows the TPA032D03 class-D 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 3–2).
Figure 3–2. Typical Headphone Plug
Left
Right
GND
3-4
Details
Plug-N-Play Platform Inputs and Outputs
3.4 Control and Indicator Circuits
Three main control circuits are provided with the TPA032D03. The mute circuit
grounds the output of the active amplifier, the mode circuit selects between the
class-D amplifier and the headphone amplifier, and the shutdown circuit
places the entire device into a power-saving sleep mode to minimize current
consumption. Each of these inputs is TTL compatible: less than 0.8 V applied
to these pins is considered a logic low, and any voltage greater than 2 V is
considered a logic high.
Two indicator pins are also provided for feedback when an under-voltage or
thermal fault exists. Module pins are provided for easy connection of off-board
control and monitoring. There are two active low fault indicator pins on the
TPA032D03amplifierIC(ICpins41and42)thatprovidefeedbackwhenafault
condition exists. Signals on these pins provide the status of the acvtive
amplifier: operational, thermal fault, and under-voltage lockout. Table 3–2 lists
the possible output conditions of these pins and a description of the fault
indicated.
Table 3–2.TPA032D03 Class-D EVM Fault Indicator Table
FAULT 0
(TP 1)
FAULT 1
(TP 2)
DESCRIPTION
1
0
1
1
No fault. — The device is operating normally.
Chargepump under-voltage lockout (VCP-UV) fault. All low-side transistors are turned on, shorting
the load to ground. Normal operation resumes when the charge pump voltage is restored (not a
latched fault), however the Fault indication remains active until cleared by cycling MUTE,
SHUTDOWN, or the power supply.
0
0
Thermal fault. All of the low-side transistors are turned on, shorting the load to ground. Once the
junction temperature drops by 20°C, normal operation resumes (not a latched fault). The Fault
indication remains active until cleared by cycling MUTE, SHUTDOWN, or the power supply.
3.5 TPA032D03 Class-D EVM Test Points
Test points have been included on the TPA032D03 class-D EVM to facilitate
user analysis of device performance and design adjustments. Table 3–3 lists
each test point and its corresponding function.
Table 3–3.TPA032D03 Class-D EVM Test Points
TEST IC PIN or EVM
FUNCTION
POINT
FUNCTION
1
2
3
HPVCC
Onboard 5-V supply
FAULT_1
FAULT_0
MSB for logic-level fault output signal, open drain
LSB for logic-level fault output signal, open drain
3-5
Details
Plug-N-Play Platform Inputs and Outputs
3.6 Module Switches
The TPA032D03 mono class-D audio amplifier evaluation module is equipped
with two pushbutton switches that allow the module shutdown and mute
functions to be manually activated.
3.6.1 S1 — Shutdown Switch
To have the module amplifier IC enter the shutdown mode, press the
Shutdown switch (S2) on the module. S2 connects the amplifier IC
SHUTDOWN pin to ground, forcing it into a low-power state. This function can
be controlled by an external control input to the SD module pin.
The shutdown mode reduces the amplifier IC current consumption to less than
1 µA compared to approximately 2.5 mA in the mute mode. The EVM
shutdown current is based on V
V
R2, R5, and R6, and capacitor
CC, DD,
leakage currents, but will typically be 97 µA ±5% for V
= 12 V and V
= 5
CC
DD
V. The plug-n-play platform typically draws 60 mA of current.
3.6.2 S2 — Mute Switch
Pushbutton switch S1 on the TPA032D03 class-D EVM allows manual muting
of the amplifier IC. S1 connects the amplifier IC MUTE pin to ground, muting
the output. The EVM Mute control input pin also allows external control of this
function.
In the mute mode, the amplifier IC lowside output transistors are turned on,
shorting the load to ground. This reduces the EVM current to 2.5 mA.
3.6.3 J1 — Headphone Jack Mode Switch
EVM headphone jack J1 is equipped with an internal switch that grounds the
amplifierMODEpinuntilaplugisinsertedintothejack. Whenaplugisinserted
into the headphone jack, the IC MODE pin goes high and the IC headphone
amplifier goes active and the class-D amplifier shuts off.
3-6
Details
Using The TPA032D03 Class-D EVM Stand-Alone
3.7 Using The TPA032D03 Class-D EVM Stand-Alone
Using the TPA032D03 mono class-D audio power amplifier evaluation module
stand-alone is much the same as using it with the platform. The same 9-V to
14-V power supply range and the isolated OUT+ and OUT– lines for BTL
operation requirements exist. Inserting a plug into the EVM headphone jack
switches the EVM to the headphone mode and shuts down the class-D
amplifier section. Figure 3–3 shows the connections that are required for
operation (with the exception of the fault monitor circuit, which is optional). The
discussion in this section is in reference to this figure unless otherwise noted.
Figure 3–3. TPA032D03 Class-D EVM Stand-Alone Connections for Mono BTL Output
LED 1
12 V
R
5 V
R
LED 0
Fault
Monitor
SLOP310
TPA032D03 EVM Board
VCC
GND
Headphone
Output Jack
C1
R4
Right HP
Input
Mute
Mode
Mute
SD
S1
Mute
S2
Shutdown
Audio
Line
Inputs
SD
C3
C4
OUT–
Left HP
Input
R2
C2
OUT+
VDD GND
VCC
5 V
Note: Capacitor C11 is optional (not assembled) and a location for it on the EVM PCB has been provided to increase design
flexibility and allow decoupling capacitance to be added.
3.7.1 Power Connections
Power must be connected to both the VCC and VDD module pins. Power
supply ground can be connected to any module ground pin, although best
results are achieved if power supply grounds are connected to the pins
adjacent to the VCC and VDD module pins. The ground and power wires
should be twisted to reduce inductance and noise pickup if they are long.
3-7
Details
Using The TPA032D03 Class-D EVM Stand-Alone
3.7.2 Input Connections
The class-D amplifier input signals can be connected in either of two ways:
differential or single-ended. For differential operation, connect the signal
source to the positive and negative inputs (IN+ and IN– module pins). For
single-ended operation, the input signal line should be connected to the IN+
module pin and the signal source ground wire should be connected to the
IN– module pin.
The EVM headphone amplifier inputs are single-ended, and the signal source
should be connected to the RHP and LHP module pins. For best results, the
ground of the signal source should be connected to the module GND pins at
the EVM headphone inputs to provide a return path for the current.
The input signal and ground wires should be twisted to reduce inductance and
noise pickup if the lead lengths are long and the cable is not shielded.
3.7.3 Output Connections
The speaker should be connected between the OUT+ and the OUT– module
pins. Inserting a plug into the EVM headphone jack switches the EVM to the
headphone mode and shuts down the class-D amplifier section.
3.7.4 Controls and Indicators
The mute, mode, and shutdown functions may be controlled externally via the
module Mute, Mode, and SD pins. An active-low input to the module Mute pin
mutes the selected amplifier. An active-low input to the module Mode pin
switches the EVM to the class-D mode and shuts off the headphone amplifier.
An active-low input to the module SD pin shuts down the device. A signal of
2 V or higher, allows normal operation.
Note that the mute, mode, and shutdown signals applied to the EVM control
input pins must be able to supply enough current to overcome the pullup
resistor on the module (100 kΩ).
The fault indicator circuit can be monitored at FAULT0 (TP1) and FAULT1
(TP2). These are open-drain outputs with 100-kΩ resistors connected to VDD
(5 V). A fault table is shown in Section 3.2.1 and in the device data sheet.
3-8
Details
TPA032D03 Class-D EVM Bill of Materials
3.8 TPA032D03 Class-D EVM Bill of Materials
The components in the bill of materials (Table 3–4) were selected for their
common values, availability, and the smallest size available to meet these
criteria.
Table 3–4.TPA032D03 Class-D EVM Bill of Materials
EVM
Qty.
Manufacturer/
Part Number
Reference
Description
Size
C1, C2, C15
Capacitor, Ceramic Chip, 0.1 µF, ±10%,
50 V, X7R
0805
3
Kemet
C0805C104J5RAC
C3, C4, C7, C8, Capacitor, Ceramic Chip, 1 µF, ±10%,
C9, C12, C13,
C23
1206
8
Kemet
C1206C105K3RAC
25 V, X7R
C16
Capacitor, Ceramic Chip, 0.047 µF, ±10%,
0805
0603
0805
1210
1
2
2
1
2
Kemet
C0805V473K5RAC
50 V, X7R
C17, C18
C5, C6
C10
Capacitor, Ceramic Chip, 5.6 pF, ±5%,
50 V, C0G,
Kemet
C0603C569J5GAC
Capacitor, Ceramic Chip, 1 nF, ±5%,
50 V, C0G,
Kemet
C0805C102J5GAC
Capacitor, Ceramic Chip, 10 µF, +80%–20%,
25 V, Y5V
muRata
GRM235Y5V106Z25
C19, C20
Capacitor, Aluminum Electrolytic, Radial Lead,
33 µF, ±20%, 35 V, FC Series, 80 mΩ @ 100
kHz, 175 ma Ripple, –55°C to +105°C
0.197” ×
0.0197” ×
0.078”
Panasonic
EEUFC1V333
C21, C22
Capacitor, Ceramic Chip, 0.22 µF, ±10%,
1206
2
1
Kemet
C1206C224K5RAC
50 V, X7R
†
C11
Not assembled
0.492” ×
0.0236” ×
0.197”
L1, L2
Inductor, SMT, 15 µH, ±20%, 2.2 ADC, 47.2 mΩ 0.398” × 0.398”
2
8
2
1
1
3
TDK
@ 1 kHz, –20 to +90°C
× 0.236”
SLF10145T–150M2R2
R1 – R7, R10
R8, R9
R13
Resistor, Thick Film Chip, SMD, 100 kΩ, ±5%,
1/10 W, 100 V, –50 to 150°C, ±200 ppm/°C
0603
Vishay/Dale
CRCW0603104J
Resistor, Thick Film Chip, SMD, 1 kΩ, ±5%, 1/10
0603
0603
0603
Vishay/Dale
CRCW0603101J
W, 100 V, –50 to 150°C, ±200 ppm/°C
Resistor, Thick Film Chip, SMD, 500 kΩ, ±5%,
1/10 W, 100 V, –50 to 150°C, ±200 ppm/°C
Vishay/Dale
CRCW0603504J
R14
Resistor, Thick Film Chip, SMD, 150 kΩ, ±5%,
1/10 W, 100 V, –50 to 150°C, ±200 ppm/°C
Vishay/Dale
CRCW0603154J
TP1 – TP3
J1
Test Points, Red
Farnell
240–345
Mini Phone Jack, 3.5 mm, N/C, Stereo
0.512” × 0.472”
1
Mouser 161–3504
Header Pins, Gold, Single, 0.5” Long, 0.25”
Wide, 0.100” centers
0.5”, 0.25”,
0.1”
16
Samtec
TSW–19–8–G–S
S1, S2
U1
Switch, Momentary, Push Button, 12 VDC,
50 mA
0.291” × 0.138”
2
1
Panasonic
EVQ-PJS04K
× 0.134”
IC, Audio Amplifier, Class-D,
10 W, 48 pin, DCA pkg
TSSOP48
TI
TPA032D03DCA
†
Capacitor C11 is optional (not assembled) and a location for it on the EVM PCB has been provided to increase design flexibility
and allow decoupling capacitance to be added.
3-9
Details
TPA032D03 Class-D EVM Schematic
3.9 TPA032D03 Class-D EVM Schematic
The TPA032D03 class-D EVM schematic is shown in Figure 3–4.
Figure 3–4. TPA032D03 Class-D EVM Schematic Diagram
J1
VDD
Ring
R3
100k
R5
100k
R6
100k
3
B
A
2
Mode
SD
R8
1k
TIP
Mute
S1
SD
TPA032D03
R9
1k
S2
Mute
1
1
48
SHUTDOWN
COSC
AGND
AGND
AGND
AGND
AGND
R1
100k
C5
1000pF
2
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
MUTE
MODE
3
4
5
6
7
8
Mode
LIN–
LIN+
C3 1µF
C4 1µF
C6
INN
INP
VDD
VCC
5 V
1000pF
COMP
AGND
VDD
12 V
C9
1µF
FAULT_0
FAULT_1
PVDD
NC
C10
TP3
TP2
C8
1µF
†
C7 1µF
C11
10µF
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
VCC
PVDD
OUTP
OUTP
PGND
PGND
OUTN
OUTN
PVDD
HPREG
VCC
VDD
L1
15µH
C22
NC
LOUT+
TP1
R13
500k
0.22µF
C21
C23
PGND
PGND
NC
1µF
L2
15µH
LOUT–
TIP
R14
150k
C12
1µF
0.22µF
NC
C19 33µF
PVDD
HPVCC
RING
RHP
C20
33µF
C18
5.6 pF
C18
R7
100k
R10
100k
HPLOUT
HPLIN
AGND
PVDD
VCP
HPROUT
HPRIN
V2P5
5.6 pF
R2 100k
C2 0.1µF
LHP
VCC
R4
100k
C1
C11
1µF
0.1µF
PVDD
PGND
HPDR
CP2
HPDL
CP1
C13
C15
0.1µF
1µF
0.047µF
C16
†
Capacitor C11 is optional (not assembled) and a location for it on the EVM PCB has been provided to increase design flexibility
and allow decoupling capacitance to be added.
3-10
Details
TPA032D03 Class-D EVM PCB Layers
3.10 TPA032D03 Class-D EVM PCB Layers
The following illustrations depict the TPA032D03 class-D EVM PCB assembly
andlayers. Thesedrawingsarenottoscale. Gerberplotscanbeobtainedfrom
any TI Sales Office.
Figure 3–5. TPA032D03 Class-D EVM Top Assembly
Figure 3–6. TPA032D03 Class-D EVM Bottom Assembly
3-11
Details
TPA032D03 Class-D EVM PCB Layers
Figure 3–7. TPA032D03 Class-D EVM Top Layer
Figure 3–8. TPA032D03 Class-D EVM Second Layer
3-12
Details
TPA032D03 Class-D EVM PCB Layers
Figure 3–9. TPA032D03 Class-D EVM Third Layer
Figure 3–10. TPA032D03 Class-D EVM Bottom Layer
3-13
Details
3-14
Details
|