Texas Instruments TPA3120D2 User Manual

Texas Instruments TPA3120D2 User Manual

25-w stereo class-d audio power amplifier
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FEATURES
1
25-W/ch into a 4-Ω Load from a 27-V Supply
2
20-W/ch into a 4-Ω Load from a 24-V Supply
Operates from 10 V to 30 V
Efficient Class-D Operation Eliminates Need
for Heat Sinks
Four Selectable, Fixed-Gain Settings
Internal Oscillator (No External Components
Required)
Single-Ended Analog Inputs
Thermal and Short-Circuit Protection With
Auto Recovery
Space-Saving Surface-Mount 24-Pin TSSOP
Package
APPLICATIONS
Televisions
Left Channel
Right Channel
10 V to 30 V
Shutdown
Mute Control
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
System Two, Audio Precision are trademarks of Audio Precision, Inc.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
25-W STEREO CLASS-D AUDIO POWER AMPLIFIER
TPA3120D2
SIMPLIFIED APPLICATION CIRCUIT
1 F
m
1 F
m
1 F
m
Control
SLOS507E – MARCH 2007 – REVISED SEPTEMBER 2007
DESCRIPTION
The TPA3120D2 is a 25-W (per channel) efficient,
Class-D audio power amplifier for driving stereo
speakers in a single-ended configuration or a mono
bridge-tied speaker. The TPA3120D2 can drive
stereo speakers as low as 4 Ω. The efficiency of the
TPA3120D2 eliminates the need for an external heat
sink when playing music.
The gain of the amplifier is controlled by two gain
select pins. The gain selections are 20, 26, 32,
36 dB.
The patented start-up and shut-down sequences
minimize pop noise in the speakers without additional
circuitry.
TPA3120D2
0.22 F
m
LIN
BSR
RIN
ROUT
PGNDR
PGNDL
LOUT
BYPASS
AGND
BSL
0.22 F
m
PVCCL
AVCC
PVCCR
VCLAMP
SD
1 F
m
MUTE
GAIN0
GAIN1
22 H
470 F
m
m
0.68 F
m
0.68 F
m
22 H
470 F
m
m
10 V to 30 V
}
4-Step Gain
Control
Copyright © 2007, Texas Instruments Incorporated
TPA3120D2

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Summary of Contents for Texas Instruments TPA3120D2

  • Page 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. System Two, Audio Precision are trademarks of Audio Precision, Inc.
  • Page 2 High-voltage analog power supply. Not internally connected to PVCCR or PVCCL Connect to ground. Thermal pad should be soldered down on all applications to secure the Thermal pad Die pad device properly to the printed wiring board. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 3: Absolute Maximum Ratings

    Low-level input current MUTE, V = 0 V, V = 30 V μA GAIN0, GAIN1, V = 0 V, V = 24 V Operating free-air temperature –40 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 4 = 1 W, f = 1 kHz; Gain = 20 dB –60 Max output at THD+N < 1%, f = 1 kHz, Signal-to-noise ratio Gain = 20 dB Thermal trip point Thermal hysteresis Oscillator frequency Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 5: Functional Block Diagram

    AVDD AVDD PGNDL DETECT AVDD/2 AGND CONTROL BIAS VCLAMP THERMAL MUTE CONTROL MUTE OSC/RAMP BYPASS BYPASS GAIN1 CONTROL GAIN0 DETECT PVCCR ROUT VCLAMP PGNDR AVDD AVDD AVDD/2 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 6: Typical Characteristics

    P = 5 W P = 1 W 0.01 0.01 10 m 100 m P − Output Power − W f − Frequency − Hz Figure 3. Figure 4. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 7 = 470 F -300 -100 100 200 1k 2k 10k 20k 100k f − Frequency − Hz f − Frequency − Hz Figure 7. Figure 8. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 8 12 V THD = 1% R = 4 (SE) Gain = 20 dB - Supply Voltage - V P − Output Power − W Figure 11. Figure 12. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 9 18 V 12 V -100 -110 -120 10 12.5 15 17.5 20 22.5 P - Output Power - W f − Frequency − Hz Figure 15. Figure 16. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 10 = 1 F filt -200 200k f - Frequency - Hz − Supply Voltage − V Figure 19. Dashed line represents thermally limited region. Figure 20. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 11 12 V -100 R = 8 (BTL) -120 Gain = 20 dB -140 P − Output Power − W f − Frequency − Hz Figure 21. Figure 22. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 12: Class-D Operation

    TPA3120D2 may be used as a bridge-tied-load (BTL) amplifier. The traditional class-D modulation scheme, which is used in the TPA3120D2 BTL configuration, has a differential output where each output is 180 degrees out of phase and changes from ground to the supply voltage, V .
  • Page 13: Input Resistance

    For design purposes, the input network (discussed in the next section) should be designed assuming an input impedance of 8 kΩ, which is the absolute minimum input impedance of the TPA3120D2. At the higher gain settings, the input impedance could increase as high as 72 kΩ.
  • Page 14 Table 3. Common Filter Responses – DC Blocking Capacitor (μF) Speaker Impedance (Ω) = 60 Hz (–3 dB) = 40 Hz (–3 dB) = 20 Hz (–3 dB) 1000 2200 1000 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 15 Figure 26. SE Filter Configuration Power-Supply Decoupling, C The TPA3120D2 is a high-performance CMOS audio amplifier that requires adequate power-supply decoupling to ensure that the output total harmonic distortion (THD) is as low as possible. Power-supply decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker. The optimum decoupling is achieved by using two capacitors of different types that target different types of noise on the power-supply leads.
  • Page 16: Shutdown Operation

    MUTE Operation The MUTE pin is an input for controlling the output state of the TPA3120D2. A logic high on this terminal causes the outputs to run at a constant 50% duty cycle. A logic low on this pin enables the outputs. This terminal may be used as a quick disable/enable of outputs when changing channels on a television or transitioning between different audio sources.
  • Page 17: Thermal Protection

    PRINTED-CIRCUIT BOARD (PCB) LAYOUT Because the TPA3120D2 is a class-D amplifier that switches at a high frequency, the layout of the printed-circuit board (PCB) should be optimized according to the following guidelines for the best possible performance.
  • Page 18 VCLAMP PGNDR PVCCR PGNDR 0.68 F Shutdown Control -OUT -OUT Mute Control 1.0 F 1.0 F 10 F 0.1 F Figure 28. Schematic for Bridge-Tied (BTL) Configuration Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 19 This is because it takes an analog input signal and converts it into a pulse-width modulated (PWM) output signal that is not accurately processed by some analyzers. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 20 20 Hz - 20 kHz Generator (a) Basic Class-AB Power Supply filt Analyzer Signal Class-D APA filt 20 Hz - 20 kHz Generator (b) Traditional Class-D Figure 29. Audio Measurement Systems Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPA3120D2...
  • Page 21 SLOS507E – MARCH 2007 – REVISED SEPTEMBER 2007 SE Input and SE Output (TPA3120D2 Stereo Configuration) The SE input and output configuration is used with class-AB amplifiers. A block diagram of a fully SE measurement circuit is shown in Figure 30.
  • Page 22 SLOS507E – MARCH 2007 – REVISED SEPTEMBER 2007 DIFFERENTIAL INPUT AND BTL OUTPUT (TPA3120D2 Mono Configuration) Many of the class-D APAs and many class-AB APAs have differential inputs and bridge-tied-load (BTL) outputs. Differential inputs have two input pins per channel and amplify the difference in voltage between the pins.
  • Page 23: Packaging Information

    PACKAGE OPTION ADDENDUM www.ti.com 29-Apr-2009 PACKAGING INFORMATION Orderable Device Status Package Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Type Drawing TPA3120D2PWP NRND HTSSOP Green (RoHS & CU NIPDAU Level-3-260C-168 HR no Sb/Br) TPA3120D2PWPG4 NRND HTSSOP Green (RoHS & CU NIPDAU Level-3-260C-168 HR no Sb/Br)
  • Page 24: Tape And Reel Information

    PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Reel Reel Pin1 Type Drawing Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant (mm) W1 (mm) TPA3120D2PWPR HTSSOP 2000 330.0 16.4 6.95 16.0 Pack Materials-Page 1...
  • Page 25 PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins Length (mm) Width (mm) Height (mm) TPA3120D2PWPR HTSSOP 2000 367.0 367.0 38.0 Pack Materials-Page 2...
  • Page 29: Important Notice

    IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All semiconductor products (also referred to herein as “components”) are sold subject to TI’s terms and conditions of sale supplied at the time...

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