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TPA032D01 Mono Class D Audio Power Amplifier Evaluation Module
User's Guide
May 2000
Mixed-Signal Products
SLOU065
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 semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright (c) 2000, Texas Instruments Incorporated
Preface
Related Documentation From Texas Instruments
J J J
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. TPA032D01 Mono Class-D Audio Power Amplifier (TI Literature Number SLOS282) This is the data sheet for the TPA032D01 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.
J
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.
Chapter Title--Attribute Reference
iii
iv
Running Title--Attribute Reference
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 TPA032D01 Class-D EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3.1 Maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3.2 Typical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-2 1-3 1-4 1-4 1-4 2-1 2-2 2-3 2-4
2
3
Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 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 3.3.1 Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3.3.2 Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3.4 Control and Indicator Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 3.5 TPA032D01 Class-D EVM Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 3.6 Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3.6.1 S1 -- Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3.6.2 S2 -- Mute Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3.7 Using the TPA032D01 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 3.8 TPA032D01 Class-D EVM Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9 3.9 TPA032D01 Class-D EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 3.10 TPA032D01 Class-D EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Chapter Title--Attribute Reference
v
Running Title--Attribute Reference
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 3-10 The TI TPA032D01 Mono Class-D Audio Power Amplifier EVM--Top View . . . . . . . . . . . 1-3 The TI TPA032D01 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 TPA032D01 Class-D EVM Stand-Alone Connections for Mono BTL Output . . . . . . . . . . . 3-7 TPA032D01 Class-D EVM Schematic Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 TPA032D01 Class-D EVM Top Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11 TPA032D01 Class-D EVM Bottom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11 TPA032D01 Class-D EVM Top Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 TPA032D01 Class-D EVM Second Layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 TPA032D01 Class-D EVM Third Layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13 TPA032D01 Class-D EVM Bottom Layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Tables
2-1 2-2 3-1 3-2 3-3 3-4 Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA032D01 Class-D EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Platform Jumper and Switch Settings for the TPA032D01 . . . . . . . . . . . . . . . . . . . . . . . . . . Platform Jumper and Switch Settings for the TPA032D01 EVM Power Inputs . . . . . . . . . TPA032D01 Class-D EVM Fault Indicator Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TPA032D01 Class-D EVM Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TPA032D01 Class-D EVM Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-3 3-3 3-5 3-5 3-9
vi
Chapter 1
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA032D01 mono class-D audio power amplifier evaluation module (SLOP309). 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
1.1 1.2 1.3
Page
Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 TPA032D01 Class-D EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Introduction
1-1
Feature Highlights
1.1 Feature Highlights
The TI TPA032D01 mono class-D audio power amplifier evaluation module and the TI plug-n-play audio amplifier evaluation platform include the following features:
-
TPA032D01 mono class-D audio power amplifier evaluation module
J J J J J J J J J J J J J J
Internal depop circuitry to greatly reduce turnon transients in outputs Single channel, bridge-tied load (BTL) only operation 12-V operation 10 W BTL output into 4 at 12 V Low current consumption in shutdown/mute mode (97 A/2.5 mA) Internal gain set to 25 dB IC shutdown and mute control inputs--TTL logic level High efficiency CE tested and approved.
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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
J J J J J J J J J
External 5-V - 15-V VCC supply inputs External regulated VDD supply input Socket for onboard 5 V/3.3 V VDD voltage regulator EVM Onboard overvoltage and reverse polarity power protection
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Platform Audio Input and Output Connections Left and right RCA phono jack inputs Miniature mono 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 TPA032D01 mono class-D audio power amplifier evaluation module is a complete, 10-W mono audio power amplifier. It consists of the TI TPA032D01 mono class-D audio power amplifier IC along with a small number of other parts mounted on a circuit board that measures approximately 2-1/4 inches by 1-3/4 inches (Figure 1-1 and 1-2).
Figure 1-1. The TI TPA032D01 Mono Class-D Audio Power Amplifier EVM--Top View
VDD GND VCC
GND C3 SD -IN+ GND C2 C1
R5
R6
Texas Instruments 2000
TP1 S2 Mute S1 R2 R1 R3 R4
TP2 C9
TP3 C14 U1 L1 TP4 +
Mute L2 SD OUT- L4
OUT+ VDD GND VCC SLOP309 TPA032D01 EVM Board
Note:
Capacitor C9 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 TPA032D01 Mono Class-D Audio Power Amplifier EVM--Bottom View
C15 C17
C6 C16
C5
C4 C7 C12 C11 C10 C13 C8
Introduction
1-3
TPA032D01 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. The platform has room for a single TPA032D01 class-D evaluation module and 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, 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 TPA032D01 Class-D EVM Specifications
All measurements made with VDD = 12 V and RL = 4 , unless otherwise noted.
1.3.1
Maximum
Supply voltage range, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 V to 14 V Supply current, IDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.6 A Continuous output power per channel, BTL, PO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 W Audio input voltage, VI (AV = 25 dB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350 mVrms
1.3.2
Typical
Supply current, no input, IDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 mA Supply current, EVM mute, IDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 mA Supply current, EVM shutdown, IDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 A Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 dB Total harmonic distortion + noise, PO = 1 W @ 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.14 %
1-4
Introduction
Chapter 2
Quick Start
Follow the steps in this chapter to quickly prepare the TPA032D01 mono class-D audio amplifier EVM for use. Using the TPA032D01 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 TPA032D01 class-D EVM. There are no jumpers or switches to set on the TPA032D01 class-D EVM board, itself.
Table 2-1. Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA032D01 Class-D EVM
POWER TYPE (Note 2) VCC (J1) AC/DC (J2) Notes: JP1 ON OFF JP2 OFF ON JP3 OFF OFF JP4 ON ON JP5 ON ON JP6 Mute Mute JP7 X X JP8 Lo Lo S1 ON ON S2 (Note 3) OFF OFF S3 U5 U5
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
2.1 2.2 2.3
Page
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Quick Start
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
8
Off JP3 Batt JP2 AC/DC JP1 (J2) VCC(J1) DC SOURCE F1 VR1 C1+
1
On ICC JP4 Pwr S1
9
11
10
7
DC Power In/Out
VR2
J1
VCC In +
SUPPLY
POWER
F2
U6
B1
D4 J2 AC/DC In Right In Stereo In
Power Input
+ VDD In/Out
J6
D3
D2
D1 R2 IDD JP5
J7 Right J8 Out
LED2 VDD
R1
J3 J4
Signal Conditioning
LED1 VCC
Audio Power Amps U3
+ Right - Out
12
Off S2
U1
Audio Input 13
17
Left In
U2
Speaker Output
14
On Conditioning
- Left Out
J5
****CAUTION**** Do not insert or remove EVM boards with power applied Plug-N-Play Audio Amplifier Evaluation Platform SLOP097 Rev. C.1 3 16 2
Mode Spk(U2-U4) C3 C2 JP8
U4
U5
Mute Polarity Lo Hi
JP6
+
JP7 HP(U5) U2-U4
J9
5
Left Out
TEXAS INSTRUMENTS 1997
U5
Stereo
Headphone Output J10
HP Out R5
+ S3 HP Source
TP1
GND
R3 R4
+
4
6
2-2
Quick Start
Quick Start List for Platform
2.2 Quick Start List for Platform
Follow these steps when using the TPA032D01 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 TPA032D01 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 TPA032D01
POWER TYPE (Note 2) VCC (J1) Notes: JP1 ON JP4 ON JP5 ON JP6 Mute JP7 X JP8 Lo S1 ON S2 (Note3) OFF S3 U5
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.
-
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) Connect 4- - 8- speakers to left and right RCA jacks J7 and J9 or to stripped wire speaker 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.
-
-
Quick Start
2-3
Quick Start List for Stand-Alone
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA032D01 class-D EVM stand-alone or to connect it into existing circuits or equipment. Connections to the TPA032D01 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.
-
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, the negative input pin (IN-) should be connected to the ground of the audio 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 TPA032D01 amplifier IC on the EVM. Note that the control signals applied to the EVM Mute and SD inputs must have sufficient current capability to overcome the 100-k 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- - 8- 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 TPA032D01 IC evaluation module, a parts list for the TPA032D01 class-D evaluation module, and module PCB layer illustrations.
Topic
3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9
Page
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Plug-N-Play Platform Power Requirements and Connections . . . . . 3-3 Plug-N-Play Platform Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . 3-4 Control and Indicator Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 TPA032D01 Class-D EVM Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 Module Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 Using the TPA032D01 Class-D EVM Stand-Alone . . . . . . . . . . . . . . . . 3-7 TPA032D01 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9 TPA032D01 Class-D EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.10 TPA032D01 Class-D EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
Details
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 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 3-1. The TI Plug-N-Play Audio Amplifier Evaluation Platform
Off On JP3 Batt JP2 AC/DC JP1 (J2) VCC(J1) DC SOURCE F1 VR1 C1+ ICC VR2 JP4 Pwr S1
J1
VCC In +
SUPPLY
POWER
F2
U6
Power Input
DC Power In/Out
B1
D4 J2 AC/DC In Right In Stereo In Left In
+ VDD In/Out
J6
D3
D2
D1 R2 IDD JP5
J7 Right J8 Out
LED2 VDD
R1
J3 J4
Signal Conditioning
LED1 VCC
Audio Power Amps U3
+ Right - Out
Off S2
U1
Audio Input J5
U2
Speaker Output
On Conditioning
Mode Spk(U2-U4) C3 C2 JP8
- Left Out
U4
****CAUTION**** Do not insert or remove EVM boards with power applied
U5
Mute Polarity Lo Hi
JP6
+
JP7 HP(U5) U2-U4
J9
Left Out
TEXAS INSTRUMENTS 1997
U5
Stereo
Plug-N-Play Audio Amplifier Evaluation Platform SLOP097 Rev. C.1
Headphone Output J10
HP Out R5
+ S3 HP Source
TP1
GND
R3 R4
+
3-2
Details
Plug-N-Play Platform Power Requirements and Connections
3.2 Plug-N-Play Platform Power Requirements and Connections
The TPA032D01 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 TPA032D01 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 TPA032D01 class-D EVM requires no setup for power source selection.
Table 3-1. Platform Jumper and Switch Settings for the TPA032D01 EVM Power Inputs
POWER TYPE (Note 2) VCC (J1) AC/DC (J2) Notes: JP1 ON OFF JP2 OFF ON JP3 OFF OFF JP4 ON ON JP5 ON ON JP6 Mute Mute JP7 X X JP8 Lo Lo S1 ON ON S2 (Note 3) OFF OFF S3 U5 U5
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 TPA032D01 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 VDD supply of 5 V is required for normal operation of the TPA032D01 EVM. VDD can either be applied to the platform VDD power input terminals (J6) or a voltage regulator (SLVP097 or equiv.) can be installed in platform socket U6 to provide VDD from the platform VCC supply. The platform is equipped with overvoltage and reverse-polarity supply voltage input protection in the form of fused crowbar circuits.
-
-
VDD voltage applied to platform screw terminals J6 MUST NOT exceed the absolute maximum rating for the TPA032D01 amplifier IC installed on the evaluation module (5.5 V) or damage to the IC may result. In no case should VDD voltage of the incorrect polarity or in excess of 6.0 V be applied to screw terminals J6 of the platform, or the power protection circuit on the VDD line will trip. VCC voltage applied to the platform MUST NOT exceed the maximum 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 VCC voltage applied to the platform exceed 15 V, or the overvoltage protection circuit on the VCC bus will trip.
Details
3-3
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 left and right RCA phono jacks (J7 and J9), left and right pairs of compression connectors for stripped speaker wires (J8), and optionally, through a miniature (1/8) mono phone jack (J10), for headphones. The audio output lines from the power amplifiers are separate all the way to the edge of the platform (output jacks J7, J8, and J9)--the OUT- lines from the power amplifier sockets are not tied to each other or to platform ground. This allows the TPA032D01 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
Two main control circuits are provided with the TPA032D01. The mute circuit grounds the output of the active 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, over-current, 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 TPA032D01 amplifier IC (IC pins 40 and 41) that provide feedback when a fault condition exists. Signals on these pins provide the status of the class-D amplifier: operational, over-current, 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. TPA032D01 Class-D EVM Fault Indicator Table
FAULT 0 (TP 1) 1 1 FAULT 1 (TP 2) 1 0 DESCRIPTION No fault. The device is operating normally. Charge pump under-voltage lockout (VCP-UV) fault. The charge pump voltage is < (PVDD + 6V). 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. Over-current fault. The output current limit has been exceeded. All output transistors are switched off, causing the load to see a high impedance state. This is a latched fault and is cleared by cycling MUTE, SHUTDOWN, or the power supply. Thermal fault. The internal junction temperature has exceeded 125C. All of the low-side transistors are turned on, shorting the load to ground. Once the junction temperature drops by 20C and is below 125C, normal operation resumes (not a latched fault). The Fault indication remains active until cleared by cycling MUTE, SHUTDOWN, or the power supply.
0
1
0
0
3.5 TPA032D01 Class-D EVM Test Points
Test points have been included on the TPA032D01 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. TPA032D01 Class-D EVM Test Points
TEST POINT 1 2 3 4 IC PIN or EVM FUNCTION FAULT_0 FAULT_1 VCCREG VCP FUNCTION LSB for logic-level fault output signal, open drain MSB for logic-level fault output signal, open drain Onboard 5-V supply Charge pump storage capacitor
Details
3-5
Plug-N-Play Platform Inputs and Outputs
3.6 Module Switches
The TPA032D01 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
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 A compared to approximately 2.5 mA in the mute mode. The EVM shutdown current is based on VCC, VDD, R2, R5, and R6, and capacitor leakage currents, but will typically be 97 A 5% for VCC = 12 V and VDD = 5 V. The plug-n-play platform typically draws 60 mA of current.
3.6.2
S2 -- Mute Switch
Pushbutton switch S1 on the TPA032D01 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
Details
Using the TPA032D01 Class-D EVM Stand-Alone
3.7 Using the TPA032D01 Class-D EVM Stand-Alone
Using the TPA032D01 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. 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. TPA032D01 Class-D EVM Stand-Alone Connections for Mono BTL Output
LED 1
5V Fault Monitor
R
R LED 0
12 V
VDD GND
VCC
GND C3 SD
R5
R6
Texas Instruments 2000
TP1 S2
TP2
TP3 C14 U1 L1
Mute
Mute L2 SD OUT-
Shutdown
Audio Inputs
-IN+ GND
TP4
Mute S1 C2 C1 R2 R1 R3 R4
C9
+
Left
OUT+ VDD GND VCC SLOP309 TPA032D01 EVM Board
L4
5V Note: Capacitor C9 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, VCC2, and VDD module pins. The ground and power wires should be twisted to reduce inductance and noise pickup if they are long.
Details
3-7
Using the TPA032D01 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 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.
3.7.4
Controls and Indicators
The mute and shutdown functions may be controlled externally via the module Mute and SD pins. An active-low input mutes the selected amplifier or shuts down the device. A signal of 2 V or higher allows normal operation. Note that the mute 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 k). The fault indicator circuit can be monitored at FAULT0 (TP1) and FAULT1 (TP2). These are open-drain outputs with 100-k 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
TPA032D01 Class-D EVM Bill of Materials
3.8 TPA032D01 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. TPA032D01 Class-D EVM Bill of Materials
Reference C12 C1, C2, C5, C7, C8, C10, C11, C13, C17 C14 C3, C4 C6 C9 Description Capacitor, Ceramic Chip, 0.1 F, 10%, 50 V, X7R Capacitor, Ceramic Chip, 1 F, 10%, 25 V, X7R Capacitor, Ceramic Chip, 47 nF, 10%, 50 V, X7R Capacitor, Ceramic Chip, 1 nF, 5%, 50 V, C0G, Capacitor, Ceramic Chip, 10 F, +80%-20%, 25 V, Y5V Not assembled Size 0805 1206 EVM Qty. 1 9 Manufacturer/ Part Number Kemet C0805C104J5RAC Kemet C1206C105K3RAC Kemet C0805V473K5RAC Kemet C0805C102J5GAC muRata GRM235Y5V106Z25
0805 0805 1210 0.492" x 0.0236" x 0.197" 1206 0.398" x 0.398" x 0.236" 0603
1 2 1 1
C15, C16 L1, L2 R1, R2 TP1 - TP4
Capacitor, Ceramic Chip, 0.22 F, 10%, 50 V, X7R Inductor, SMT, 15 H, 20%, 2.2 ADC, 47.2 m @ 1 kHz, -20 to +90C Resistor, Thick Film Chip, SMD, 100 k, 5%, 1/10 W, 100 V, -50 to 150C, 200 ppm/C Test Points, Red Header Pins, Gold, Single, 0.5" Long, 0.25" Wide, 0.100" centers
2 2 2 4
Kemet C1206C224K5RAC TDK SLF10145T-150M2R2 Vishay/Dale CRCW0603104J Farnell 240-345 Samtec TSW-19-8-G-S Panasonic EVQ-PJS04K TI TPA032D01DCA
0.5", 0.25", 0.1" 0.291" x 0.138" x 0.134" TSSOP48
16 2 1
S1, S2 U1
Switch, Momentary, Push Button, 12 VDC, 50 mA IC, Audio Amplifier, Class-D, 32 W, 48 pin, DCA pkg
Capacitor C9 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.
Details
3-9
TPA032D01 Class-D EVM Schematic
3.9 TPA032D01 Class-D EVM Schematic
The TPA032D01 class-D EVM schematic is shown in Figure 3-4.
Figure 3-4. TPA032D01 Class-D EVM Schematic Diagram
VDD
R1 100k
SD
R2 100k S2 SD TPA032D01
1 2 SHUTDOWN COSC AGND AGND AGND AGND AGND FAULT_0 FAULT_1 48 47 46 45 44 43 42 41 MUTE 3 AGND 4 INN 5 INP 6 COMP 7 AGND 8 9 10 VDD PVDD OUTP OUTP PGND PGND OUTN OUTN PVDD VCCREG NC NC AGND PVDD VCP NC CP1
VDD VCC VCC2
5V 12 V 12 V
Mute
S1 Mute
LIN- LIN+
C3 1000pF
C2 1F C1 1F C4 1000pF C9 C6 10F C7 1F C15 C17 1F 0.22F C16 0.22F C5 1F
TP1 TP2
C8 1F
VCC2
VCC LOUT+
L1 15H L2 15H
11 12 13 14 15 16 17 18 19 20 21
LOUT-
VCC
C10 1F C12 0.1F
22 23 24
TP4
PVDD 40 39 NC 38 NC 37 PGND 36 PGND 35 NC 34 NC 33 PVDD 32 VCC 31 NC 30 NC 29 V2P5 28 PVDD 27 PGND 26 NC 25 CP2
TP3 C13 1F C11 1F
C14
0.047F
Capacitor C9 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
TPA032D01 Class-D EVM PCB Layers
3.10 TPA032D01 Class-D EVM PCB Layers
The following illustrations depict the TPA032D01 class-D EVM PCB assembly and layers. These drawings are not to scale. Gerber plots can be obtained from any TI Sales Office.
Figure 3-5. TPA032D01 Class-D EVM Top Assembly
Figure 3-6. TPA032D01 Class-D EVM Bottom Assembly
Details
3-11
TPA032D01 Class-D EVM PCB Layers
Figure 3-7. TPA032D01 Class-D EVM Top Layer
Figure 3-8. TPA032D01 Class-D EVM Second Layer
3-12
Details
TPA032D01 Class-D EVM PCB Layers
Figure 3-9. TPA032D01 Class-D EVM Third Layer
Figure 3-10. TPA032D01 Class-D EVM Bottom Layer
Details
3-13
3-14
Details

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