Texas Instruments TAP6203A1 User manual

July 2002 Mixed-Signal Products
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User’s Guide
SLOU123A

IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third–party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2002, Texas Instruments Incorporated

EVM IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided
may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective
considerations, including product safety measures typically found in the end product incorporating the goods.
As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic
compatibility and therefore may not meet the technical requirements of the directive.
Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned
within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE
WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,
IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY
PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products
received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction
of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic
discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE
TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not
exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or
infringement of patents or services described herein.
Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about temperatures
and voltages. For further safety concerns, please contact the TI application engineer.
Persons handling the product must have electronics training and observe good laboratory practice standards.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any
machine, process, or combination in which such TI products or services might be or are used.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2002, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the supply voltage range of 2.5 V to 5.5 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.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2002, Texas Instruments Incorporated

Information About Cautions and Warnings
iii
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
JTI 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.
JTPA6203A1 1.25-W Mono Fully Differential Audio Power
Amplifier (literature number SLOS364) This is the data sheet for
the TPA6203A1 audio amplifier integrated circuit.

FCC Warning
iv
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.

Contents
v
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Feature Highlights 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 TPA6203A1 EVM Specifications 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Operation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Precautions 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Quick Start List for Platform 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Quick Start List for Stand-Alone 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 References 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.1 TPA6203A1 EVM Connected for Stereo BTL Output 2-6. . . . . . . . . . . . . . . . . . . . .
2.4.2 TPA6203A1 EVM Schematic Diagram 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.3 TPA6203A1 Audio Power Amplifier Evaluation Module Parts List 2-7. . . . . . . . . .
2.4.4 TPA6203A1 EVM PCB Layers 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures
1–1 The TI TPA6203A1 Audio Amplifier Evaluation Module 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Quick Start Platform Map 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Quick Start Module Map 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 TPA6203A1 EVM Connected for Stereo BTL Output 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–4 TPA6203A1 EVM Schematic Diagram 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–5 TPA6203A1 EVM Top Layer 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–6 TPA6203A1 EVM Bottom Layer 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
2–1 Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA6203A1 EVM 2-1.
2–2 Platform Jumper and Switch Settings for the TPA6203A1 EVM 2-3. . . . . . . . . . . . . . . . . . . . . .
2–3 TPA6203A1 EVM Parts List 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
vi

1-1
Introduction
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA6203A1
MicroStar JuniorBGA audio amplifier evaluation module (SLOP369). It
includes a list of EVM features, a brief illustrated description of the module, and
a list of EVM specifications.
Topic Page
1.1 Feature Highlights 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 TPA6203A1 EVM Specifications 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Feature Highlights
1-2
1.1 Feature Highlights
The TI TPA6203A1 audio amplifier evaluation module and the TI plug-n-play
audio amplifier evaluation platform include the following features:
-TPA6203A1 Low-Voltage Audio Power Amplifier Evaluation Module
J2 mm x 2 mm MicroStar JuniorBGA
JFully differential amplifier
JSingle channel, bridge-tied load (BTL)
J2.5-V and 5.5-V operation
J1.25-W output power into 8 Ωat 5 V, BTL
JInternal depop and quick start-up circuitry
JInternal thermal and short-circuit protection
JModule gain is set at 5 V/V
-Quick and Easy Configuration With the TI Plug-n-Play Audio Amplifier
Evaluation Platform
JEvaluation module is designed to simply plug into the platform,
automatically making all signal, control, and power connections.
JPlatform provides flexible power options.
JJumpers on the platform select power and module control options.
JSwitches on the platform route signals.
JPlatform provides quick and easy audio input and output connections.
-Platform Power Options
JOnboard 9-V battery
JExternal 5-V–15-V (VCC) supply inputs
JExternal regulated VDD supply input
JSocket for onboard 5-V/3.3-V VDD voltage regulator EVM
JOnboard overvoltage and reverse polarity power protection
-Platform Audio Input and Output Connections
JLeft and right RCA phono jack inputs
JMiniature stereo phone jack input
JLeft and right RCA phono jack outputs
JLeft and right compression speaker terminal outputs
JMiniature stereo headphone jack output

Description
1-3
Introduction
1.2 Description
The TPA6203A1 audio power amplifier evaluation module is a complete,
low-power single-channel audio power amplifier. It consists of the TI
TPA6203A1 1.25-W low-voltage audio power amplifier IC in a very small
MicroStar JuniorBGA 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 TPA6203A1 Audio Amplifier Evaluation Module
†Due to the very small size of the MicroStar JuniorBGA IC package, the standard part number
TPA6203A1 is replaced with the code AADI.
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, which has room for a pair of TPA6203A1 evaluation modules,
is a convenient vehicle for demonstrating TI’s audio power amplifier and

TPA6203A1 EVM Specifications
1-4
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 TPA6203A1 EVM Specifications
Supply voltage range, VDD 2.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power supply current rating required 450 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output power, PO:8-ΩBTL, VDD = 5 V 1.25 W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio input voltage, VI0 V to VDD, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Minimum load impedance, ZL8 Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1
Operation
Operation
Follow the steps in this chapter to prepare the TPA6203A1 audio amplifier
EVM for use. Using the TPA6203A1 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
TPA6203A1 EVM. They cause the TPA6203A1 amplifier IC on the EVM to shut
down 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
TPA6203A1 EVM
EVM JP6 JP7 JP8 S2 S3
TPA6203A1 Mute X Lo 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
2.1 Precautions 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Quick Start List for Platform 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Quick Start List for Stand-Alone 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 References 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Precautions
2-2
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
Signal Conditioning
****CAUTION****
Do not insert or remove
EVM boards with power
applied
ICC
JP4
F1
VR1
R1
JP3
JP2 JP1 AC/DC
(J2)
VCC(J1)
D1 D2 D3
D4 J2
J3 J4 J5
AC/DC
In
VCC
In
+
J1
DC
SOURCE
LED1 VCC
LED2 VDD
R2
JP5 IDD
B1
U6
POWER
SUPPLY
U3 U4
U5
U1
U2
Audio
Power
Amps
OnOff ConditioningS2
J7 J8 Right
Out Left
Out
+–+–
JP6
Mode
Mute
Spk(U2-U4)
JP8
J9 Left
Out
JP7
S3 HP Source
U2-U4
U5
Polarity
Lo
Hi
HP(U5)
C3 C2
++
R3
R5
J10
Stereo
HP Out
TP1
GND
Plug-N-Play Audio Amplifier
Evaluation Platform
SLOP097 Rev. C.1
Stereo
In
Right
In Left
In
J6 In/Out VDD
F2
VR2 +
DC
Power
In/Out
Speaker
Output
Headphone
Output
Audio
Input
Power
Input
Batt
C1+
Right
Out
On Off Pwr
S1
TEXAS INSTRUMENTS 1997
R4
6a
1
3
6b
6b
6b 6b
89
10
9
2
4
5

Quick Start List for Platform
2-3
Operation
2.2 Quick Start List for Platform
Follow these steps when using the TPA6203A1 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.
-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 TPA6203A1 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 Lo.
5) Set jumper JP6 to select the mute control input (which causes the
TPA6203A1 to shut down if a plug is inserted into platform headphone jack
J10).
Table 2–2. Platform Jumper and Switch Settings for the TPA6203A1 EVM
EVM JP6 JP7 JP8 S2 S3
TPA6203A1 Mute X Lo 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 equivalent.) 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 appropri-
ate 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
to stereo miniature phone jack J4.
9) Connect 8-Ω–32-Ωspeakers to left and right RCA jacks J7 and J9 or to
stripped wire connector 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.

Quick Start List for Stand-Alone
2-4
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA6203A1 EVM stand-alone or when
connecting it into existing circuits or equipment. Connections to the
TPA6203A1 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
5
4
6
2
‡Due to the very small size of the MicroStar JuniorBGA IC package, the standard part number TPA6203A1 is replaced with
the code AADI.
-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 positive lead from the audio source to the module IN+ pin and
the negative lead to the IN–pin.

Quick Start List for Stand-Alone
2-5
Operation
5) Connect the SHUTDOWN pin through a normally open switch to GND.
6) Connect an 8-Ω–32-Ωspeaker 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 begins operation.
8) Adjust the signal source level as needed.

References
2-6
2.4 References
2.4.1 TPA6203A1 EVM Connected for Stereo BTL Output
Figure 2–3.TPA6203A1 EVM Connected for Stereo BTL Output
Audio
Input
(Left)
External Mute Control
Right
Audio
Input
(Right)
5 VDC
Left
5 VDC
†Due to the very small size of the MicroStar JuniorBGA IC package, the standard part number TPA6203A1 is replaced with
the code AADI.

TPA6203A1 Audio Power Amplifier Evaluation Module Parts List
2-7
Operation
2.4.2 TPA6203A1 EVM Schematic Diagram
Figure 2–4.TPA6203A1 EVM Schematic Diagram
C3
0.22 µF
C2
0.22 µF
R5
100 kΩ
IN–
SHUTDOWN S1
OUT–
GND
OUT+
R4
100 kΩ
R2
20 kΩ
C5
10 µF
C4
0.22 µF
SHUTDOWN
BYPASS
IN+
IN–
VO–
GND
VDD
VO+
A1
B2
A3
B3
B1
C1
C2
C3
GND
VDD
2.5 V to 5.5 V
+
C1
0.22 µF
IN+ R1
20 kΩ
R3
100 kΩ
2.4.3 TPA6203A1 Audio Power Amplifier Evaluation Module Parts List
Table 2–3.TPA6203A1 EVM Parts List
Reference Description Size Qty. Manufacturer/
Part Number Digi-Key Number
C5 Capacitor, 10 µF, 6.3 V A 1 Panasonic
ECS-TOJY106R Digi-Key PCS1106CT-ND
C1 –C4 Capacitor, 0.22 µF, 80%/–20%,
nonpolarized 0603 4 Panasonic ECJ–1VF1C224Z Digi-Key PCC1790TR–ND
R1, R2 Resistor, 20 kΩ, 1/16 W, 1% 0603 2 Panasonic
ERJ3RBF
R3 –R5 Resistor, 100 kΩ, 1/16 W, 1% 0603 3 Panasonic
S1 Switch, momentary 1 Panasonic
P8048SCT-ND Digi-Key P8048SCT-ND
Terminal post headers 7Sullins
PTC36SABN Digi-Key S1022-36-ND
U1 IC, TPA6203A1GQV†, audio
amplifier, 1.25 W, mono 2mm x 2mm 1 TI TPA6203A1DGN
PCB1 PCB, TPA6203A1 EVM 1
†Due to the very small size of the MicroStar JuniorBGA IC package, the standard part number TPA6203A1 is replaced with
the code AADI.
Note: All items are SMD except terminal posts.

TPA6203A1 EVM PCB Layers
2-8
2.4.4 TPA6203A1 EVM PCB Layers
The following illustrations depict the TPA6203A1 EVM PCB layers and silks-
creen. These drawings are not to scale. Gerber plots can be obtained from any
TI sales office.
Figure 2–5.TPA6203A1 EVM Top Layer