Texas Instruments TPA4411 User manual

TPA4411
Audio Power Amplifier Evaluation Module
August 2004 Mixed-Signal Products
User’s Guide
SLOU172

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Copyright 2004, 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 assumesno 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 2004, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the voltage range of 1.8 V to 4.5 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 2004, Texas Instruments Incorporated

Information About Cautions and Warnings
v
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.
JTPA4411 80-mW Capless Stereo Headphone Amplifier
(literature number SLOS430) This is the data sheet for the
TPA4411 audio amplifier integrated circuit.
Trademark
NanoFreetis a trademark of Texas Instruments Incorporated.

FCC Warning
vi
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
vii
Contents
1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Description 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 EVM Specifications 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Operation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Quick Start for Stand Alone Operation 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.1 Power and Ground 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.2 Inputs and Outputs 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.3 Power Up 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Reference 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 TPA4411EVM Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 TPA4411EVM Bill of Materials 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 TPA4411EVM PCB Layers 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures
3−1 TPA4411EVM Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−2 Top Layer 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−3 Bottom Layer 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
3−1 TPA4411EVM Bill of Materials 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
viii

1-1
Introduction
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA4411
capless stereo headphone amplifier evaluation module. It includes a brief
description of the module and a list of EVM specifications.
Topic Page
1.1 Description 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 EVM Specifications 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Description
1-2
1.1 Description
The TPA4411 is a capless stereo headphone amplifier capable of delivering
80 mW/Ch without the added output DC blocking capacitors. The TPA4411
EVM includes connections for input, power, ground, pushbuttons, and a head-
phone jack for the outputs.
1.2 EVM Specifications
Supply voltage range, VDD 1.8 V to 4.5 V
Supply current, IDD 0.5 A max
Continuous output power, Po, VDD = 4.5 V, 16 Ω80 mW

2-1
Operation
Operation
This chapter describes how to operate the TPA4411EVM.
Topic Page
2.1 Quick Start for Stand Alone Operation 2-2. . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

Quick Start for Stand Alone Operation
2-2
2.1 Quick Start for Stand Alone Operation
Use the following steps when operating the TPA4411EVM stand alone or when
connected the EVM into an existing circuit.
2.1.1 Power and Ground
1) Ensure that the external power sources are set to OFF.
2) Connect the power supply with a voltage between 1.8 V and 4.5 V to the
EVM. Make sure to connect the ground connection first and then connect
the positive supply. Verify that the connections are made to the correct
pins.
2.1.2 Inputs and Outputs
2.1.2.1 Audio
1) Ensure that the audio source is set to the minimum level.
2) Connect the audio source to the inputs, INL and INR.
3) Connect the headphone amplifier to the headphone jack provided on the
EVM. Output pins, OUTL and OUTR, are also provided for connections to
external circuits.
2.1.2.2 Shutdown Controls
1) The TPA4411 provides independent shutdown controls so that each chan-
nel can be controlled separately. The shutdown pins, SDL and SDR, are
active low. This means that a low voltage (ground) on this pin will place the
appropriate channel in shutdown mode. Using the pushbuttons provided
on the EVM, the TPA4411 can be placed in shutdown by pressing and
holding the button(s) down. Both buttons must be depressed in order for
both channels of the TPA4411 to turn off. When the buttons are released,
the appropriate channel on the device will restart.
2.1.3 Power Up
1) Verify the correct connections as described in Sections 2.1.1 and 2.1.2.
2) Verify the correct voltage setting of the power supply and turn ON the pow-
er supply. Proper operation of the EVM should begin.
3) Adjust the audio signal source as needed.

3-1
Reference
Reference
This chapter includes the EVM schematic, parts list, and board layout
reference.
Topic Page
3.1 TPA4411EVM Schematic 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 TPA4411EVM Bill of Materials 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 TPA4411EVM PCB Layers 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3

TPA4411EVM Schematic
3-2
3.1 TPA4411EVM Schematic
Figure 3−1.TPA4411EVM Schematic
C6 10 µF
VDD
GND R1 121 kΩSDL
JP1
SDR
R2 121 kΩ
C3 2.2 µF
C4 2.2 µF
C5 2.2 µF
X4
IN_R
IN_L
OUT_R
C1 1 µF
C2 1 µF
OUT_L
C1P
PGND
C1N
NC4
PVSS
INR
SDR
INL
NC12
OUTR
NC20 20
19 18 17 16
PVDD
SDL
SGND
NC16
NC6 SVSS NC8 OUTL SVSS
U1
TPA4411
1
2
3
4
5
15
14
13
12
11
6 7 8 9
10
C7
(optional)
(test point)

TPA4411EVM Bill of Materials
3-3
Reference
3.2 TPA4411EVM Bill of Materials
Table 3−1.TPA4411EVM Bill of Materials
Qty. Reference Description SMD
Size Manufacturer/ Part Number
2C1, C2 Capacitor, ceramic, 1 µF, 10 V, Y5V, +80% −20% 0603 TDK
C1608Y5V1C105Z
2C3, C4, C5 Capacitor, ceramic, 2.2 µF, 6.3 V, X5R, 20% 0603 TDK
C1608X5R0J225M
1 C6 Capacitor, ceramic, 10 µF, 6.3V, Y5V, 20% 0805 TDK
C2012X5R0J106
0 C7 Not installed 0603
2R1, R2 Resistor, 121 kΩ, 1/16 W, 1% 0603 Panasonic
ERJ−3EKF1213J
2SDL, SDR Momentary switch Panasonic,
P8048SCT−ND
1 U1 TPA4411 audio amplifier IC 4 ×4 thin QFN package Texas Instruments,
TPA4411RTJ
1 J1 Headphone jack Kycon, Inc., P/N
ST−3000
0 JP1 2 Position, 2 mm header (not installed)
7PNP
Headers Terminal post headers Sullins, PTC36SABN
SAMTEC
TSW−19−8−G−S
1 PCB TPA4411EVM printed circuit board

TPA4411EVM PCB Layers
3-4
3.3 TPA4411EVM PCB Layers
Figure 3−2.Top Layer
Figure 3−3.Bottom Layer
C7