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Texas Instruments TPA731 MSOP Audio Power Amplifier EVM User guides
 User’s Guide
November 2000
Mixed-Signal Products
SLOU088
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
Customers are responsible for their applications using TI components.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
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Copyright  2000, Texas Instruments Incorporated
Information About Cautions and Warnings
Preface
Read This First
Information About Cautions and Warnings
This book may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you.
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.
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.
TPA731 700-mW Low-Voltage Audio Power Amplifier (literature
number SLOS315) This is the data sheet for the TPA731 audio
amplifier integrated circuit.
Read This First
iii
FCC Warning
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.
iv
Running Title—Attribute Reference
Contents
1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1
Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3
TPA731 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
1-2
1-3
1-3
2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2
Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3
Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.1 TPA731 MSOP EVM Connected for BTL Output . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2 TPA731 MSOP EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.3 TPA731 MSOP Audio Power Amplifier Evaluation Module Parts List . . . . . . . .
2.4.4 TPA731 MSOP EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1
2-2
2-3
2-4
2-5
2-5
2-6
2-6
2-7
Figures
1–1
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
The TI TPA731 Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA731 MSOP EVM Connected for Stereo BTL Output . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA731 MSOP EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA731 EVM PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA731 EVM Silkscreen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA731 EVM Top Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TPA731 EVM Bottom Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3
2-2
2-4
2-5
2-6
2-7
2-7
2-8
2-8
Tables
2–1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA731
MSOP EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2–2. Platform Jumper and Switch Settings for the TPA731 MSOP EVM . . . . . . . . . . . . . . . . . . . . . 2-3
2–3. TPA731 MSOP EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Contents
v
vi
Chapter 1
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA731
MSOP audio amplifier evaluation module (SLOP342). 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
TPA731 MSOP EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
Introduction
1-1
Feature Highlights
1.1 Feature Highlights
The TI TPA731 MSOP audio amplifier evaluation module and the TI
plug-n-play audio amplifier evaluation platform include the following features:
TPA731 low-voltage audio power amplifier evaluation module
Single channel, bridge-tied load (BTL)
2.5-V and 5.5-V operation
700-mW output power into 8 Ω at 5 V, BTL
Ultra-low current consumption in shutdown mode
Internal thermal and short-circuit protection
Module gain is set at –4 V/V in BTL mode, –2 V/V in SE mode
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
Onboard 9-V battery
External 5-V–15-V (VCC) supply inputs
External regulated VDD supply input
Socket for on-board 5-V/3.3-V VDD voltage regulator EVM
Onboard overvoltage and reverse polarity power protection
Platform Audio Input and Output Connections
1-2
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
Introduction
Description
1.2 Description
The TPA731 MSOP audio power amplifier evaluation module is a complete,
low-power single-channel audio power amplifier. It consists of the TI TPA731
700-mW low-voltage audio power amplifier IC in a very small MSOP package,
along with a small number of other parts mounted on a circuit board that is
approximately one and a quarter inches square (see Figure 1–1).
Figure 1–1. The TI TPA731 Audio Amplifier Evaluation Module
VDD GND
Shutdown
+
S1
C4
R1
C1
R2
R3
C2
R4
C3
U1 †
C5
R5
OUT–
GND
OUT+
C6
TEXAS
INSTRUMENTS
IN–
GND
SLOP342
TPA731 MSOP EVM
† Due to the very small size of the MSOP IC package, the standard part number TPA731 is
replaced with the code TAJC.
Single in-line header pins are mounted to the underside of the module circuit
board. These pins 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, with room for a pair of TPA731 MSOP evaluation modules, 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,
and connects them to a versatile array of standard audio input and output jacks
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 TPA731 EVM Specifications
Supply voltage range, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 V to 5.5 V
Supply current, IDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 mA, max
Continuous output power, PO: 8-Ω BTL, VDD = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700 mW
Audio input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Vpp, max
Minimum load impedance, RL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ω
Introduction
1-3
1-4
Introduction
Chapter 2
Operation
Follow the steps in this chapter to quickly prepare the TPA731 MSOP audio
amplifier EVM for use. Using the TPA731 MSOP 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
TPA731 MSOP EVM. They will cause the TPA731 device to shutdown 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 TPA731
MSOP EVM
EVM
JP6
JP7
JP8
S2
S3
TPA731
Mute
X
Hi
See 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.
Topic
Page
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
2.1
Precautions
2.2
Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3
2.3
Quick Start List for Stand-Alone
2.4
Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
. . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
Operation
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 VCC power input connector J1, J2, and/or VDD power
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
6b
ICC
+ Right –
Out
9
U2
U1
U4
+ Left –
Out
J5
On
Conditioning
Speaker
Output
5
JP6
+
4
Stereo
Headphone
Output
J10
+
S3
HP
Source
R4
Left
J9 Out
Spk(U2-U4) C3 C2
JP8
JP7
HP(U5)
U2-U4
U5
U5
TP1
GND
TEXAS
INSTRUMENTS
1997
Mode
Mute
Polarity
Lo
Hi
R3
3
Out
LED2
VDD
U3
Off
S2
J4
Left
In
Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
J7 Right J8
JP5
IDD
LED1
VCC
J3
Stereo
In
****CAUTION****
Do not insert or remove
EVM boards with power
applied
DC
Power
In/Out
J6
VDD
In/Out
D1
D2
D3
Right
In
Audio
Input
2-2
R2
Audio
Power
Amps
Signal Conditioning
8
+
B1
D4 J2
AC/DC
In
R1
6a
F2
6b
Power
Input
VR2
S1
U6
POWER
SUPPLY
JP4
Pwr
VR1
On
Off
JP3
Batt
JP2 AC/DC
J1
VCC
In
+
JP1 (J2)
VCC(J1)
DC
SOURCE
F1 C1+
6b
6b
1 10
HP Out
R5
2
Operation
Quick Start List for Platform
2.2 Quick Start List for Platform
Follow these steps when using the TPA731 MSOP 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 are set to off and that the platform
power switch S1 is set to off.
2) Install a TPA731 MSOP module in platform sockets U3 and U4 for stereo
operation (or a module in either U3 or U4 for single channel operation),
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 Mute control input (causes the TPA731 to
shutdown if a plug is inserted into platform headphone jack J10).
Table 2–2. Platform Jumper and Switch Settings for the TPA731 MSOP EVM
EVM
JP6
JP7
JP8
S2
S3
TPA731
Mute
X
Hi
See 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.
Power supply
6) Select and connect the power supply:
a) Connect an external regulated power supply set to a voltage between
2.5 V and 5.5 V to platform VDD power input connector J6, taking care
to observe marked polarity, or
b) Install a voltage regulator EVM (SLVP097 or equiv.) in platform socket
U6. Install a 9-V battery in B1 or connect a 7 V – 12 V power source
to a platform VCC power input J1 or J2 and jumper the appropriate
power input (see platform user’s guide).
Inputs and outputs
7) Ensure that signal source level is set to minimum.
8) Connect the audio source to left and right RCA phono jacks J3 and J5 or
stereo miniature phone jack J4.
9) Connect 8-Ω–32-Ω speakers to left and right RCA jacks J7 and J9 or to
stripped wire connectors J8.
Power-up
10) Verify correct voltage and input polarity and set the external power supply
to ON. If VCC and an on-board regulator EVM are used to provide VDD, set
platform power switch S1 to on.
Platform LED2 lights indicating the presence of VDD, and the evaluation
modules installed on the platform begin operation.
11) Adjust the signal source level as needed.
Operation
2-3
Quick Start List for Stand-Alone
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA731 MSOP EVM stand-alone or when
connecting it into existing circuits or equipment. Connections to the TPA731
MSOP 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 2–2.
Figure 2–2. Quick Start Module Map
2
Vdd GND
Shutdown
+
5
S1
C4
R1
C1
R2
R3
C2
R4
C3
U1 †
C5
R5
OUT–
GND
6
OUT+
C6
TEXAS
INSTRUMENTS
IN–
4
IN+
SLOP342
TPA731 MSOP EVM
† Due to the very small size of the MSOP IC package, the standard part number TPA731 is
replaced with the code TIAJC.
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.
Inputs and outputs
3) Ensure that the signal source level is set to minimum.
4) Connect the audio source to the module IN– and IN+ pins, taking care to
observe marked polarity.
5) Connect the shutdown (S1) pin to VDD through a normally open switch.
6) Connect an 8-Ω–32-Ω speaker to the module OUT+ and OUT– pins.
Power-up
7) Verify correct voltage and input polarity and set the external power supply
to on.
The EVM should begin operation.
8) Adjust the signal source level as needed.
2-4
Operation
Reference
2.4 Reference
2.4.1
TPA731 MSOP EVM Connected for BTL Output
Figure 2–3. TPA731 MSOP EVM Connected for Stereo BTL Output
5 VDC
Vdd GND
Shutdown
+
S1
C4
R1
U1 †
C1
R2
R3
C2
R4
C3
C5
OUT–
GND
C6
TEXAS
INSTRUMENTS
Audio Input
(Right)
IN–
GND
SLOP342
TPA731 MSOP EVM
5 VDC
GND
Vdd
External Mute
Control
(active high)
GND
Shutdown
+
S1
C4
R1
C1
R2
R3
C2
R4
C3
Audio Input
(Left)
Right
OUT+
R5
U1 †
C5
R5
OUT–
GND
Left
OUT+
C6
TEXAS
INSTRUMENTS
IN–
GND
SLOP342
TPA731 MSOP EVM
† Due to the very small size of the MSOP IC package, the standard part number TPA731 is replaced with the code TIAJC.
Operation
2-5
Reference
2.4.2
TPA731 MSOP EVM Schematic Diagram
Figure 2–4. TPA731 MSOP EVM Schematic Diagram
S1
NO
Shutdown
1
2
R1
20 kΩ
C1
C2 1 µF
1 µF
3
R2
39 kΩ
4
GND
C3
1 µF
Shutdown VO –
Bypass
GND
In+
VDD
In –
VO +
7
6
5
OUT–
C5
1 µF
R3
20 kΩ
GND
OUT+
R5
39 kΩ
Audio Input–
R4
20 kΩ
2.4.3
VDD
2.5 V to 5.5 V C4 GND
10 µF
+
8
C6
5 pF
TPA731 MSOP Audio Power Amplifier Evaluation Module Parts List
Table 2–3. TPA731 MSOP EVM Parts List
Reference
Description
Size
EVM
Qty.
Manufacturer/
Part Number
Vendor
Number
A
1
Panasonic
ECS-TOJY106R
Digi-Key
PCS1106CT-ND
Murata
GRM39-Y5V105Z10PT
Newark
C4
Capacitor, 10 µF, 6.3 V
C1, C2,
C3, C5
Capacitor, 1 µF, 80%/–20%,
nonpolarized
0603
3
C6
Capacitor, pad only
0603
0
R1, R3, R4
Resistor, 20 kΩ, 1/16 W, 5%
0603
2
Panasonic
ERJ-3GSYJ203
Digi-Key
P20KGCT-ND
R2, R5
Resistor, 39 kΩ, 1/16 W, 5%
0603
1
Panasonic
ERJ-3GSYJ393
Digi-Key
P39KGCT-ND
S1
Switch, momentary
1
Panasonic
P8048SCT-ND
Digi-Key
P8048SCT-ND
Terminal Post Headers
9
Sullins
PTC36SABN
Digi-Key
S1022-36-ND
1
TI
TPA731DGN
U1
IC, TPA731DGN†, audio
amplifier, 700 mW, mono
PCB1
PCB, TPA731 MSOP EVM
MSOP-8
1
† Due to the very small size of the MSOP IC package, the standard part number TPA731 is replaced with the code TIAJC.
Note:
2-6
All items are SMD except as noted.
Operation
TPA731 MSOP EVM PCB Layers
2.4.4
TPA731 MSOP EVM PCB Layers
The following illustrations depict the TPA731 EVM PCB layers and silkscreen.
These drawings are not to scale. Gerber plots can be obtained from any TI
sales office.
Figure 2–5. TPA731 EVM PCB
Figure 2–6. TPA731 EVM Silkscreen
Operation
2-7
TPA731 MSOP EVM PCB Layers
Figure 2–7. TPA731 EVM Top Layer
Figure 2–8. TPA731 EVM Bottom Layer
2-8
Operation
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