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TPA2000D2 Filterless Class D Audio Power Amplifier Evaluation Module
User's Guide
August 2000
Mixed-Signal Products
SLOU077A
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
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. TPA2000D2 2-W STEREO CLASS-D AUDIO POWER AMPLIFIER (literature number SLOS291) This is the data sheet for the TPA2000D2 audio amplifier integrated circuit.
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.
Chapter Title--Attribute Reference
iii
iv
Running Title--Attribute Reference
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 TPA2000D2 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 2-1 2-2 2-3 2-5
2
3
Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3.2 The TPA2000D2 Audio Power Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . 3-3 3.2.1 TPA2000D2 Audio Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 3.2.2 Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3.2.3 Differential Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3.2.4 Depop Circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 3.3 Using the TPA2000D2 EVM With the Plug-N-Play Evaluation Platform . . . . . . . . . . . . . 3-7 3.3.1 Installing and Removing EVM Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 3.3.2 TPA2000D2 Module Jumper Settings and Switches . . . . . . . . . . . . . . . . . . . . . . 3-8 3.3.3 Signal Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9 3.3.4 Mute (Shutdown)/Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 3.3.5 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11 3.3.6 Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 3.4 Using the TPA2000D2 EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13 3.5 TPA2000D2 Audio Power Amplifier Evaluation Module Parts List . . . . . . . . . . . . . . . . 3-14 3.6 TPA2000D2 Filterless Class-D EVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 3.7 TPA2000D2 Filterless Class-D EVM PCB Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Chapter Title--Attribute Reference
v
Running Title--Attribute Reference
Figures
1-1 1-2 2-1 2-2 2-3 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 3-10 3-11 3-12 3-13 3-14 3-15 The TI TPA2000D2 Audio Amplifier EVM Without Output Filter -- Top View . . . . . . . . . . . 1-3 The TI TPA2000D2 Audio Amplifier EVM Without Output Filter -- Bottom View . . . . . . . . 1-3 Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Module Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 The TI Plug-N-Play Audio Amplifier Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 The TI TPA2000D2 Audio Amplifier EVM Without Output Filter -- Top View . . . . . . . . . . . 3-3 The TI TPA2000D2 Audio Amplifier EVM Without Output Filter -- Bottom View . . . . . . . . 3-3 TPA2000D2 EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 TPA2000D2 Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5 TPA2000D2 EVM Jumpers and Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8 Platform Signal Routing and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9 Mute/Mode and Polarity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10 Typical Headphone Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12 TPA2000D2 EVM Connected for Stereo Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13 TPA2000D2 Filterless Class-D EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 TPA2000D2 Filterless Class-D EVM Top Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16 TPA2000D2 Filterless Class-D EVM Bottom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16 TPA2000D2 Filterless Class-D EVM Top Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17 TPA2000D2 Filterless Class-D EVM Bottom Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Tables
2-1 2-2 2-3 2-4 2-5 3-1 3-2 3-3 3-4 Typical TI Plug-N-Play Platform Jumper and Switch Settings for the TPA2000D2 . . . . . . 2-1 Typical TPA2000D2 EVM Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Platform Jumper and Switch Settings for the TPA2000D2 . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Typical TPA2000D2 EVM Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 TPA2000D2 EVM Gain Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 TPA2000D2 EVM Gain Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 TPA2000D2 EVM Gain Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8 Typical TPA2000D2 EVM Jumper Settings for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . 3-13 TPA2000D2 EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
vi
Chapter 1
Introduction
This chapter provides an overview of the Texas Instruments (TI) TPA2000D2 filterless class-D audio amplifier evaluation module (SLOP312A). 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 TPA2000D2 EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Introduction
1-1
Feature Highlights
1.1 Feature Highlights
The TI TPA2000D2 audio amplifier evaluation module and the TI plug-n-play audio amplifier evaluation platform include the following features:
-
TPA2000D2 Stereo 2-W Filterless Class-D Audio Power Amplifier Evaluation Module
-
J J J J J J J J J J J J J J J J J J J J J J J J
Class-D without output filter Internal depop circuitry to minimize transients in outputs High efficiency Low distortion Low supply current (8 mA) 2 W per channel output power into 3 at 5 V Low current consumption in shutdown mode Four selectable gain settings: 8, 12, 17.5, and 23.5 dB Differential stereo inputs 24-pin TSSOP PWP package
Quick and Easy Configuration With the TI Plug-N-Play Audio Amplifier Evaluation Platform Evaluation module is designed to simply plug into the platform, automatically making all signal, control, and power connections Platform provides flexible power options Jumpers on the platform select power and module control options Switches on the platform route signals Platform provides quick and easy audio input and output connections
-
Platform Power Options External 5-V - 15-V dc 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
-
Platform Audio Input and Output Connections Left and right RCA phono jack inputs Miniature stereo phone jack input Left and right RCA phono jack outputs Left and right compression speaker terminal outputs Miniature stereo headphone jack output
1-2
Introduction
Description
1.2 Description
The TPA2000D2 filterless class-D stereo audio power amplifier evaluation module is a complete, 2-watt per channel class-D stereo audio power amplifier that can operate without an output filter. It consists of the TI TPA2000D2 class-D stereo 2-W 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 1-1/2 inches (Figure 1-1 and Figure 1-2).
Figure 1-1. The TI TPA2000D2 Audio Amplifier EVM Without Output Filter--Top View
+ VDD GND RIN+ RIN- C16 C8 C4 C3 R2 C2 C1 C6 R3 C5 SHUTDOWN LIN- LIN+ GND C15 VDD + GND GND ROUT+ GND ROUT- C11 C12 GAIN1 C7 GAIN0 R1 C10 C9 U1 SHUTDOWN LOUT- GND LOUT+
Figure 1-2. The TI TPA2000D2 Audio Amplifier EVM Without Output Filter--Bottom View
Single in-line header pins extend from the underside of the module circuit board to 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.
S1
2000
TPA2000D2 EVM SLOP312 Rev A
C21 C17 C20 C18
C19 R4
Introduction
1-3
TPA2000D2 EVM Specifications
The platform has room for a single TPA2000D2 evaluation module and 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 TPA2000D2 EVM Specifications
Supply voltage range, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 V to 5.5 V Supply current, IDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 A max Continuous output power per channel, PO: 3 , VDD = 5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 W Minimum load impedance, RL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1-4
Introduction
Chapter 2
Quick Start
The steps in this chapter can be followed to quickly prepare the TPA2000D2 filterless class-D audio amplifier EVM for use. Using the TPA2000D2 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 can be wired directly into existing circuits or equipment. The platform switch and jumper settings shown in Table 2-1 are typical for the TPA2000D2 EVM and will cause the TPA2000D2 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 TPA2000D2
EVM P-N-P Platform Notes: JP4 X JP5 ON JP6 Mute JP7 X JP8 Lo S2 Note 2 S3 U5
1) ON = Jumper installed, OFF = Jumper NOT Installed, 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.
Table 2-2. Typical TPA2000D2 EVM Jumper Settings
EVM TPA2000D2 Note: GAIN0 OFF GAIN1 OFF
ON = Jumper installed, OFF = Jumper NOT Installed, X = Don't care
Topic
2.1 2.2 2.3
Page
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Quick Start List for Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
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
7b
JP3 Batt JP2 AC/DC JP1 (J2) VCC(J1) DC SOURCE F1 VR1 C1+
1 13
Off On ICC
7b
7b
VR2
JP4 Pwr S1
J1
VCC In +
SUPPLY
POWER
7a
F2
U6
7b
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
Signal Conditioning
LED1 VCC
Audio Power Amps U3
+ Right - Out
9
J4 U1
Off S2
10
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
+
5
JP7 HP(U5) U2-U4
J9
Left Out
TEXAS INSTRUMENTS 1997
U5
Stereo
Plug-N-Play Audio Amplifier Evaluation Platform SLOP097 Rev. C.1 3 2
Headphone Output J10
HP Out R5
+ S3 HP Source
TP1
GND
R3 R4
+
6
4
2-2
Quick Start
Quick Start List for Platform
2.2 Quick Start List for Platform
Follow these steps when using the TPA2000D2 EVM with the TI plug-n-play audio amplifier evaluation platform (see the platform user's guide, literature number SLOU011, for additional details). Numbered callouts for selected steps are shown in Figure 2-1 and Figure 2-2, 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 TPA2000D2 module in platform socket U2, 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 (causes the TPA2000D2 to shut down if a plug is inserted into platform headphone jack J10). 6) If a headphone amplifier will be installed in U5, set headphone source switch S3 to U5.
Table 2-3. Platform Jumper and Switch Settings for the TPA2000D2
EVM P-N-P Platform Notes: JP4 X JP5 ON JP6 Mute JP7 X JP8 Lo S2 Note 2 S3 U5
1) ON = Jumper installed, OFF = Jumper NOT Installed, 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
1) Select and connect the power supply (ensure power supply is set to OFF ): a) Connect an external regulated power supply set to 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. 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). If using J1, J2, or B1, set S1 to ON to supply power to the EVM.
-
Inputs and outputs
1) Ensure that the audio signal source level is set to minimum. 2) Connect the audio source to left and right RCA phono jacks J3 and J5 or stereo miniature phone jack J4. 3) Connect speakers to left and right RCA jacks J7 and J9 or to stripped wire speaker connectors J8.
Quick Start
2-3
Quick Start List for Platform
-
Evaluation Module Preparations
1) Use jumpers GAIN0 and GAIN1 to set the gain (Figure 2-2 and Table 2-4).
Figure 2-2. Module Preparation
+ VDD GND RIN+ RIN- C16 C8 C4 C3 R2 C2 C1 C6 R3 C5 SHUTDOWN LIN- LIN+ GND C15 VDD + GND GND ROUT+ GND ROUT- C11 C12 GAIN1 C7
11
GAIN0 R1 C10 C9 U1 SHUTDOWN LOUT- GND LOUT+
Table 2-4. Typical TPA2000D2 EVM Jumper Settings
GAIN1 OFF OFF ON ON Note: GAIN0 OFF ON OFF ON GAIN (dB) 8 12 17.5 23.5
S1
2000
TPA2000D2 EVM SLOP312 Rev A
ON = Jumper installed, OFF = Open, X = Don't care
-
Power Up
1) 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 should light indicating the presence of VDD, and the evaluation modules installed on the platform should begin operation. 2) Adjust the signal source level as needed.
2-4
Quick Start
Quick Start List for Stand-Alone
2.3 Quick Start List for Stand-Alone
Follow these steps to use the TPA2000D2 EVM stand-alone or when connecting it into existing circuits or equipment. Connections to the TPA2000D2 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 2-3 and details appear in Chapter 3.
Figure 2-3. Quick Start Module Map
+ VDD GND RIN+ RIN- C16 C8 C4 C3 R2 C2 C1 C6 R3 C5 SHUTDOWN LIN- LIN+ GND C15 VDD + GND GND ROUT+ GND ROUT- C11 C12 GAIN1 C7
5
GAIN0 R1 C10 C9 U1 SHUTDOWN LOUT- GND LOUT+
S1
2000
TPA2000D2 EVM SLOP312 Rev A
-
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
1) Ensure that audio signal source level adjustments are set to minimum. 2) Connect the right (left) positive lead of the audio source to the module RIN+ (LIN+) pins and the negative lead to the RIN- (LIN-) pins.
Quick Start
2-5
Quick Start List for Stand-Alone
-
Evaluation module preparations
1) Use jumpers GAIN0 and GAIN1 to set the gain as shown in Table 2-5.
Table 2-5. TPA2000D2 EVM Gain Settings
GAIN1 OFF OFF ON ON Note: GAIN0 OFF ON OFF ON GAIN (dB) 8 12 17.5 23.5
ON = Jumper installed, OFF = Open, X = Don't care
-
Control inputs
1) SHUTDOWN: A low shuts down the amplifier IC on the module; a high or float allows normal operation. Power up 1) Connect external power supply set to 5 V across EVM VDD and GND pins. 2) Verify correct voltage and input polarity and set the external power supply to ON. The EVM should begin operation. 3) Adjust the signal source level as needed.
2-6
Quick Start
Chapter 3
Details
This chapter provides details on the TPA2000D2 IC, the evaluation module, and the steps in the Quick-Start List, additional application information, and a parts list for the TPA2000D2 evaluation module.
Topic
3.1 3.2 3.3 3.4 3.5 3.6 3.7
Page
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 The TPA2000D2 Audio Power Amplifier Evaluation Module . . . . . . . 3-3 Using the TPA2000D2 EVM With the Plug-N-Play Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7 Using The TPA2000D2 EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . . . 3-13 TPA2000D2 Audio Power Amplifier Evaluation Module Parts List 3-14 TPA2000D2 Filterless Class-D EVM Schematic . . . . . . . . . . . . . . . . 3-15 TPA2000D2 Filterless Class-D EVM PCB Layers . . . . . . . . . . . . . . . 3-16
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
The TPA2000D2 Audio Power Amplifier Evaluation Module
3.2 The TPA2000D2 Audio Power Amplifier Evaluation Module
The TPA2000D2 audio power amplifier evaluation module is powered by a TPA2000D2 stereo power amplifier capable of delivering greater than 2 W of continuous power per channel into 3- loads. The evaluation module includes a control input for shutdown. The module can be used with the TI plug-n-play audio amplifier evaluation platform (Figure 3 -1) or wired directly into circuits or equipment. The module has single in-line header connector pins mounted to the under side of the board. These pins allow the module to be plugged into the TI platform, which automatically makes all the signal input and output, power, and control connections to the module. The module connection pins are on 0.1-inch centers to allow easy use with standard perf board and plug board-based prototyping systems. Or, the EVM can be wired directly into existing circuits and equipment when used standalone. The module appears in Figure 3-2 and Figure 3-3, and its schematic is shown in Figure 3 - 4.
Figure 3-2. The TI TPA2000D2 Audio Amplifier EVM Without Output Filter--Top View
+ VDD GND RIN+ RIN- C16 C8 C4 C3 R2 C2 C1 C6 R3 C5 SHUTDOWN LIN- LIN+ GND C15 VDD + GND GND ROUT+ GND ROUT- C11 C12 GAIN1 C7 GAIN0 R1 C10 C9 U1 SHUTDOWN LOUT- GND LOUT+
S1
2000
TPA2000D2 EVM SLOP312 Rev A
Note:
Capacitors C9 - C12, C15, and C16 are optional (not assembled) and pad locations for them on the EVM PCB have been provided to increase design flexibility.
Figure 3-3. The TI TPA2000D2 Audio Amplifier EVM Without Output Filter--Bottom View
C21 C17 C20 C18
C19 R4
Details
3-3
The TPA2000D2 Audio Power Amplifier Evaluation Module
Figure 3-4. TPA2000D2 EVM Schematic Diagram
GND LOUT-
GAIN0
C1 0.1 F LIN+ R3 120 k C2 0.1 F LIN-
U1 TPA2000D2 1 C9 2 C17 0.1 F 3 4 PGND LOUTN GAIN0 LPVDD PGND LOUTP BYPASS LPVDD LINP VDD 24 23 22 21 20 C21 0.1 F 19 GAIN1 C6 10 F C10 C5 1 F
GND
LOUT+
R1 120 k
5 LINN 6 C3 0.1 F C7 220 pF 7 8 C18 0.1 F 9 10 C4 0.1 F S1 AGND COSC RINN RPVDD SDZ
VDD VDD
RIN-
18 ROSC C20 0.1 F 17 RINP RPVDD 16
R2 120 k C8 10 F
RIN+
11 ROUTN 12 PGND
15 GAIN1 C19 0.1 F 14 ROUTP PGND 13 C11 + C16
R4 120 k ROUT+ GND + C15 GND
GND
C12 SHUTDOWN
GND ROUT-
3.2.1
TPA2000D2 Audio Amplifier IC
The TPA2000D2 class-D stereo audio power amplifier integrated circuit converts low-level audio into pulse-width-modulated (PWM) signals. The IC features high-current output transistors and internal feedback that provides excellent performance without the need for external components. The modulation scheme allows the amplifier to be used without an output filter. Typical applications include multimedia systems and portable computers. A full range of protection features are built into the TPA2000D2 amplifier IC to increase device reliability including thermal, overcurrent, and undervoltage shutdown. The device is provided in a very small 24-pin thermally-enhanced PowerPAD TSSOP surface-mount package and consumes only 1 A in the shutdown mode, making the TPA2000D2 an excellent choice for portable battery-powered applications. Although the TPA2000D2 IC amplifier comes in a PowerPAD package, the PowerPAD is not needed and is not used in this EVM due to the high efficiency of this part. A block diagram of the TPA2000D2 amplifier IC appears in Figure 3-5. For more information, see the TPA2000D2 amplifier IC data sheet, TI literature number SLOS291.
3-4
Details
The TPA2000D2 Audio Power Amplifier Evaluation Module
Figure 3-5. TPA2000D2 Amplifier IC
VDD AGND PVDD + _ Gate Drive
VDD RINN Gain Adjust
ROUTN
_ + + _
PGND PVDD _ Gate Drive
RINP
Gain Adjust
+
ROUTP
PGND SHUTDOWN GAIN1 GAIN0 2 Gain COSC ROSC BYPASS Ramp Generator Biases and References Start-up Protection Logic OC Detect OC Detect
Thermal
VDD ok PVDD
LINP
Gain Adjust
+ _
Gate Drive
LOUTP
_ + + _
PGND PVDD _ Gate Drive
LINN
Gain Adjust
LOUTN
+
PGND
Details
3-5
The TPA2000D2 Audio Power Amplifier Evaluation Module
3.2.2
Gain
The gain of the amplifier is pin-selectable with GAIN0 and GAIN1 input terminals. The gain for each GAIN0/GAIN1 combination is shown in Table 3-1.
Table 3-1. TPA2000D2 EVM Gain Settings
GAIN1 OFF OFF ON ON Note: GAIN0 OFF ON OFF ON GAIN (dB) 8 12 17.5 23.5
ON = Jumper installed, OFF = Open, X = Don't care
Since the overall gain of the amplifier is set by the internal preamplifier stage and not by the power amplifier stage, the TPA2000D2 maintains the same total harmonic distortion (THD) at even the highest gain settings.
3.2.3
Differential Input
The differential input stage of the amplifier cancels any noise that appears on both input lines of a channel. To use the TPA2000D2 EVM with a differential source, connect the positive lead of the audio source to the RIN+ (LIN+) input and the negative lead from the audio source to the RIN- (LIN-) input. To use the TPA2000D2 with a single-ended source, ac-ground the RIN- and LIN- inputs through a capacitor and apply the audio signal to the RIN+ and LIN+ inputs. In a single-ended input application, the RIN+ and LIN+ inputs should be ac-grounded at the audio source instead of at the device inputs for best noise performance.
3.2.4
Depop Circuitry
The TPA2000D2 amplifier IC contains internal circuitry to minimize the various transients that might appear at the output during the transition from power on/off or entering and leaving shutdown.
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Details
Using the TPA2000D2 EVM With the Plug-N-Play Evaluation Platform
3.3 Using the TPA2000D2 EVM With the Plug-N-Play Evaluation Platform
The TPA2000D2 audio amplifier evaluation module was designed to be used with the TI plug-n-play audio amplifier evaluation platform. It simply plugs into socket U2. The following paragraphs provide additional details for using the TPA2000D2 EVM with the platform.
3.3.1
Installing and Removing EVM Boards
TI plug-n-play evaluation modules use single-in-line header pins installed on the underside of the module circuit board to plug into sockets on the platform. The EVM pins and the platform sockets are keyed such that only the correct type of EVM can be installed in a particular socket, and then only with the proper orientation. Evaluation modules are easily removed from the platform by simply prying them up and lifting them out of their sockets. Care must be taken, however, to prevent bending the pins.
3.3.1.1
EVM Insertion
1) Remove all power from the evaluation platform. 2) Locate socket U2 on the platform. 3) Orient the module correctly. 4) Carefully align the pins of the module with the socket pin receptacles. 5) Gently press the module into place. 6) Check to be sure that all pins are seated properly and that none are bent over.
3.3.1.2
EVM Removal
1) Remove all power from the evaluation platform. 2) Using an appropriate tool as a lever, gently pry up one side of the module a small amount. 3) Change to the opposite side of the module and use the tool to pry that side up a small amount. 4) Alternate between sides, prying the module up a little more each time to avoid bending the pins, until it comes loose from the socket. 5) Lift the EVM off the platform.
Details
3-7
Using the TPA2000D2 EVM With the Plug-N-Play Evaluation Platform
3.3.2
TPA2000D2 Module Jumper Settings and Switches
The TPA2000D2 EVM is equipped with a pushbutton SPST switch and two jumpers that act as SPST switches to allow module operation to be modified to suit various requirements. In the following discussion, setting a jumper to ON means that a shunt is installed across the two pins of the jumper. Setting a jumper to OFF means that no shunt is installed on the jumper. See Figure 3.6. In typical applications, some or all of the jumper functions are controlled by the system microcontroller or external logic.
Figure 3-6. TPA2000D2 EVM Jumpers and Switches
GND LOUT-
GAIN0
C1 0.1 F LIN+ R3 120 k C2 0.1 F LIN-
U1 TPA2000D2 1 C9 2 C17 0.1 F 3 4 PGND LOUTN GAIN0 LPVDD PGND LOUTP BYPASS LPVDD LINP VDD 24 23 22 21 20 C21 0.1 F 19 GAIN1 C6 10 F C10 C5 1 F
GND
LOUT+
R1 120 k
5 LINN 6 C3 0.1 F C7 220 pF 7 8 C18 0.1 F 9 10 C4 0.1 F S1 AGND COSC RINN RPVDD SDZ
VDD VDD
RIN-
18 ROSC C20 0.1 F 17 RINP RPVDD 16
R2 120 k C8 10 F
RIN+
11 ROUTN 12 PGND
15 GAIN1 C19 0.1 F 14 ROUTP PGND 13 C11 + C16
R4 120 k ROUT+ GND + C15 GND
GND
C12 SHUTDOWN
GND ROUT-
3.3.2.1
S1 -- Shutdown Switch
Pushbutton switch S1 on the EVM allows the manual shutdown of the TPA2000D2 amplifier IC.
3.3.2.2
GAIN0 and GAIN1 -- Gain Select Jumpers
Jumpers GAIN0 and GAIN1 select the gain of the TPA2000D2 amplifier IC line as shown in Table 3-2.
Table 3-2. TPA2000D2 EVM Gain Settings
GAIN1 OFF OFF ON ON Note: GAIN0 OFF ON OFF ON GAIN (dB) 8 12 17.5 23.5
ON = Jumper installed, OFF = Open, X = Don't care
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Details
Using the TPA2000D2 EVM With the Plug-N-Play Evaluation Platform
3.3.3
Signal Routing
Signal flow on the platform is controlled by two signal routing switches, as shown in Figure 3 -7.
Figure 3-7. Platform Signal Routing and Outputs
Off + R Audio Input L U1 Signal Conditioning S2 U2 TPA2000D2 Amplifier EVM L On U5 Stereo Headphone Amplifier R S3 L L U5 GND U2 - U4 R + - J10 Headphone Output - + L + R R - - J7, J8, J9 Speaker Outputs
3.3.3.1
Signal Conditioning
The audio signal from the input jacks can be applied to the signal conditioning socket (U1) if an EVM is installed there, or socket U1 can be bypassed and the audio input signal applied directly to the inputs of the TPA2000D2. Switch S2 selects signal conditioning or bypasses it.
3.3.3.2
Headphone Output Jack
Switch S3 is the source select for the stereo headphone output jack, J10. The headphone jack is capacitively coupled (via 470 F electrolytics) and can output either the signal from the headphone amplifier in socket U5, or the signal from the power amplifier installed in socket U2, as determined by the setting of headphone source select switch S3.
-
The platform headphone output jack (J10) is not used in conjunction with the TPA2000D2 class-D EVM. Switch S3 should be set to the U5 position when the TPA2000D2 class-D EVM is installed on the platform.
Details
3-9
Using the TPA2000D2 EVM With the Plug-N-Play Evaluation Platform
3.3.4
Mute (Shutdown)/Mode
The TPA2000D2 EVM is equipped with a shutdown control input pin. When this input is pulled to ground, the TPA2000D2 amplifier IC on the module enters the shutdown mode and dissipates very little power. When the EVM control input is tied to GND or allowed to float, normal amplifier operation resumes. In typical applications, as often found in notebook computers, portable audio products, and such, the internal speakers mute when headphones are plugged into the headphone jack, or internal speakers mute when external speakers are connected. In applications using separate speaker and headphone amplifiers, the one not being used can be shut down to conserve power.
3.3.4.1
Headphone Jack Control Signals
The platform headphone output jack (J10) contains an internal switch that changes the state of a pair of control lines when a plug is inserted (Figure 3 - 8). Each control line is pulled down by a 1-k resistor to ground (R4 and R5). The switch in the headphone jack pulls one line or the other up to VDD through a 240- resistor (R3) depending on whether a plug is inserted in J10 or not.
Figure 3-8. Mute/Mode and Polarity Control
VDD R3 240 J10 Headphone Jack R4 1 k R5 1 k
Polarity JP8 Lo
JP6 Mode U2 Power Amplifier
Hi
SPK (U2-U4)
Mute
3.3.4.2
Mute/Mode Select (JP6)
A 3-pin jumper header (JP6) on the platform, functioning as an SPDT switch, routes the control signal from the headphone jack to either the mute control input pin or the mode control input pin of the evaluation module.
3.3.4.3
Set jumper JP6 to MUTE when a separate headphone amplifier IS installed in U5. This will cause the TPA2000D2 class-D EVM to shut down when a plug is inserted into platform headphone jack J10.
Mute/Mode Polarity Select (JP8)
A second 3-pin jumper header (JP8) on the platform selects the control signal polarity by connecting either the active-high or the active-low line from the headphone jack to jumper JP6.
3-10
Set jumper JP8 to Lo for normal class-D operation when a separate headphone amplifier IS installed in U5.
Details
Power Requirements
3.3.5
Power Requirements
The TPA2000D2 audio power amplifier evaluation module can operate from any voltage between approximately 4.5 V and 5.5 V; however, the TPA2000D2 amplifier IC on the module is characterized for operation at 5 V. For best performance (highest output power with lowest distortion), the module should be operated at approximately 5 V unless there is a specific reason for operating it from a different voltage. The TI plug-n-play audio amplifier evaluation platform with a voltage regulator EVM installed on it can provide a regulated VDD supply from a wide variety of unregulated VCC voltage inputs between approximately 5.5 V and 12 V, including an onboard 9 -V battery. Or, an external regulated power source can be used to supply VDD voltage to the platform and the TPA2000D2 evaluation module installed on it. Although the TPA2000D2 amplifier IC draws approximately 0.65 A from the power supply during continuous full power output, peak current draw can be as high as 1 A. Any power supply connected to the platform should be capable of providing 1 A of current to avoid clipping of the output signal during peaks. Current consumption driving speakers at normal listening levels is typically 0.1 A or less. 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 TPA2000D2 amplifier IC installed on the evaluation module (6 V) or damage to the IC may result. In no case should VDD voltage of the incorrect polarity or in excess of 6.1 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
3-11
Inputs and Outputs
3.3.6
Inputs and Outputs
The TI plug-n-play audio amplifier evaluation platform is equipped with several standard conectors for audio inputs and outputs.
3.3.6.1
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) stereo 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.
3.3.6.2
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). 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 TPA2000D2 power amplifier EVM to operate in the highly-efficient bridge-tied load configuration when driving speakers. The platform headphone jack (J10) outputs the signal from a headphone amplifier installed in platform U5 and also contains a switch to signal when a headphone plug (Figure 3-9) has been inserted into the jack. When the platform is configured as shown in Table 2-3, the TPA2000D2 power amplifier EVM installed in U2 shuts down when the headphone plug is inserted (see 3.3.4).
Figure 3-9. Typical Headphone Plug
Left Right GND
3-12
Details
Using the TPA2000D2 EVM Stand-Alone
3.4 Using the TPA2000D2 EVM Stand-Alone
Using the TPA2000D2 audio power amplifier evaluation module stand-alone is much the same as using it with the platform. The same 4.5-V to 5.5-V power supply range and the isolated OUT+ and OUT- line requirement exists (Figure 3-10). Note that the shutdown signal applied to the EVM SHUTDOWN pin must be able to supply enough current to overcome the pullup resistor on the module (120 k).
Figure 3-10. TPA2000D2 EVM Connected for Stereo Output
+ VDD ROUT+ GND C16 ROUT- C8 C4 C3 R2 C2 C1 C6 R3 C5 SHUTDOWN C11 C12 GAIN1 C7 GAIN0 R1 C10 C9 U1 SHUTDOWN LOUT- C15 VDD + GND GND LOUT+
GND
Audio Input (Right)
GND RIN+ RIN-
Right
S1
2000
TPA2000D2 EVM SLOP312 Rev A
External Shut Down Control (active low)
Audio Input (Left)
LIN- LIN+ GND
Left
5V
Table 3-3. Typical TPA2000D2 EVM Jumper Settings for Stand-Alone
EVM TPA2000D2 Note: GAIN0 OFF GAIN1 OFF
ON = Jumper installed, OFF = Jumper NOT Installed, X = Don't care
Details
3-13
TPA2000D2 Audio Power Amplifier Evaluation Module Parts List
3.5 TPA2000D2 Audio Power Amplifier Evaluation Module Parts List
Table 3-4. TPA2000D2 EVM Parts List
Reference C1-4, C17-21 C5 C6, C8 C7 C9 - C12 C15, C16 C13, C14 R1 - R4 S1 Description Capacitor, ceramic chip, 0.1 F, 10%, X7R, 50 V Capacitor, ceramic, 1.0 F, 80%/-20%, Y5V, 16 V Capacitor, ceramic, 10 F, 80%/-20%, Y5V, 16 V Capacitor, ceramic, 220 pF, 10%, XICON, 50 V Not assembled Not assembled Reference designators not used Resistor, chip, 120 k, 1/10 W, 5%, XICON Switch, momentary pushbutton, 12 V, 50 mA Header, 2 position Shunts Headers, 0.1 in centers, 1/2 in long 0805 0.291 X 0.138 X 0.134" 2 mm 2 mm 0.5 X 0.25 X 0.1" 24 pin TSSOP 2.25 X 1.5" 4 1 Mouser 260-120K Panasonic EVQ-PJS04K Norcomp DigiKey # 2163-02-ND 3M Samtec T SW-19-8-G-S TI TPA2000D2PWP TI SLOP312A Size 0805 0805 1210 0805 0805 1210 EVM Qty. 9 1 2 2 Manufacturer/ Part Number Kemet C0805C104K5RAC Murata GRM40-Y5V105Z16 Murata GRM235-Y5V106Z16 Mouser 140-CC501B221K
GAIN0, GAIN1
2 2 17
U1 PCB
IC, TPA2000D2, audio power amplifier, 2-W, 2-channel, class-D PCB, TPA2000D2 EVM
1 1
Capacitors C9 - C12, C15, and C16 are optional (not assembled) and pad locations for them on the EVM PCB have been provided to increase design flexibility.
3-14
Details
TPA2000D2 Filterless Class-D EVM Schematic
3.6 TPA2000D2 Filterless Class-D EVM Schematic
The TPA2000D2 filterless class-D EVM schematic is shown in Figure 3-11.
Figure 3-11. TPA2000D2 Class-D EVM Schematic Diagram
GND LOUT-
GAIN0
C1 0.1 F LIN+ R3 120 k C2 0.1 F LIN-
U1 TPA2000D2 1 C9 2 C17 0.1 F 3 4 PGND LOUTN GAIN0 LPVDD PGND LOUTP BYPASS LPVDD LINP VDD 24 23 22 21 20 C21 0.1 F 19 GAIN1 C6 10 F C10 C5 1 F
GND
LOUT+
R1 120 k
5 LINN 6 C3 0.1 F C7 220 pF 7 8 C18 0.1 F 9 10 C4 0.1 F S1 AGND COSC RINN RPVDD SDZ
VDD VDD
RIN-
18 ROSC C20 0.1 F 17 RINP RPVDD 16
R2 120 k C8 10 F
RIN+
11 ROUTN 12 PGND
15 GAIN1 C19 0.1 F 14 ROUTP PGND 13 C11 + C16
R4 120 k ROUT+ GND + C15 GND
GND C12 SHUTDOWN
GND ROUT-
Capacitors C9 - C12, C15, and C16 are optional (not assembled) and pad locations for them on the EVM PCB have been provided to increase design flexibility.
Details
3-15
TPA2000D2 Filterless Class-D EVM PCB Layers
3.7 TPA2000D2 Filterless Class-D EVM PCB Layers
The following illustrations depict the TPA2000D2 filterless class-D EVM PCB assembly and layers. These drawings are not to scale. Gerber plots can be obtained from any TI Sales Office.
Figure 3-12. TPA2000D2 Filterless Class-D EVM Top Assembly
Figure 3-13. TPA2000D2 FIlterless Class-D EVM Bottom Assembly
3-16
Details
TPA2000D2 Filterless Class-D EVM PCB Layers
Figure 3-14. TPA2000D2 Filterless Class-D EVM Top Layer
Figure 3-15. TPA2000D2 Filterless Class-D EVM Bottom Layer
Details
3-17
3-18
Details

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