tpa3120d2

Manufacturer Part Numbertpa3120d2
Description25-w Stereo Class-d Audio Power Amplifier
ManufacturerTexas Instruments Incorporated
tpa3120d2 datasheet
 


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25-W STEREO CLASS-D AUDIO POWER AMPLIFIER
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
Control
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.
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
SIMPLIFIED APPLICATION CIRCUIT
TPA3120D2
1 F
m
LIN
BSR
RIN
ROUT
1 F
m
PGNDR
PGNDL
1 F
m
LOUT
BYPASS
AGND
BSL
PVCCL
AVCC
PVCCR
VCLAMP
SD
MUTE
GAIN0
GAIN1
TPA3120D2
SLOS507E – MARCH 2007 – REVISED SEPTEMBER 2007
0.22 F
m
22 H
470 F
m
m
0.68 F
m
0.68 F
m
22 H
470 F
m
m
0.22 F
m
10 V to 30 V
1 F
m
}
4-Step Gain
Control
Copyright © 2007, Texas Instruments Incorporated

tpa3120d2 Summary of contents

  • Page 1

    ... Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. 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 ...

  • Page 2

    ... Reference for preamplifier inputs. Nominally equal to AVCC/8. Also controls start-up time via external capacitor sizing. 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 device properly to the printed wiring board. Product Folder Link(s): TPA3120D2 www.ti.com PGNDL PGNDL LOUT BSL ...

  • Page 3

    ... MUTE GAIN0, GAIN1 Product Folder Link(s): TPA3120D2 TPA3120D2 SLOS507E – MARCH 2007 – REVISED SEPTEMBER 2007 VALUE UNIT –0 –0 0.3 CC –0 See Dissipation Ratings table – –40 to 150 –65 to 150 3.2 ± ...

  • Page 4

    ... Ω kHz kHz, A-weighted filter, Gain = kHz; Gain = Max output at THD+N < 1 kHz, Gain = 20 dB Product Folder Link(s): TPA3120D2 www.ti.com MIN TYP MAX UNIT 7 AVCC ...

  • Page 5

    ... Copyright © 2007, Texas Instruments Incorporated FUNCTIONAL BLOCK DIAGRAM FUNCTIONAL BLOCK DIAGRAM AVDD AVDD AVDD/2 CONTROL BIAS THERMAL OSC/RAMP AVDD AVDD AVDD/2 Product Folder Link(s): TPA3120D2 TPA3120D2 SLOS507E – MARCH 2007 – REVISED SEPTEMBER 2007 BSL PVCCL HS LOUT + VCLAMP - LS PGNDL SC DETECT VCLAMP SC ...

  • Page 6

    ... 0.01 10k 20k 20 TOTAL HARMONIC DISTORTION + NOISE 10k 20k Product Folder Link(s): TPA3120D2 www.ti.com vs FREQUENCY = 24 V (SE 100 1k 10k f − Frequency − Hz Figure 2. vs OUTPUT POWER (SE) ...

  • Page 7

    ... filt filt C = 470 10k 20k 20 100 200 f − Frequency − Hz Product Folder Link(s): TPA3120D2 TPA3120D2 CROSSTALK vs FREQUENCY (SE 10k 20k f − Frequency − Hz Figure 6. GAIN/PHASE vs FREQUENCY 200 Gain 100 0 Phase -100 -200 ...

  • Page 8

    ... A. Dashed region. 100 THD = Product Folder Link(s): TPA3120D2 www.ti.com OUTPUT POWER vs SUPPLY VOLTAGE (SE Gain = 20 dB THD = 10% THD = − Supply Voltage − line represents thermally limited Figure 10 ...

  • Page 9

    ... Product Folder Link(s): TPA3120D2 TPA3120D2 SLOS507E – MARCH 2007 – REVISED SEPTEMBER 2007 SUPPLY CURRENT vs OUTPUT POWER (SE Gain = − Output Power − Figure 14 ...

  • Page 10

    ... A. Dashed region. Product Folder Link(s): TPA3120D2 www.ti.com TOTAL HARMONIC DISTORTION + NOISE vs OUTPUT POWER (BTL) L Gain = 100 − Output Power − Figure 18 ...

  • Page 11

    ... (BTL) -120 L Gain = 20 dB -140 Product Folder Link(s): TPA3120D2 TPA3120D2 SLOS507E – MARCH 2007 – REVISED SEPTEMBER 2007 POWER SUPPLY REJECTION RATIO vs FREQUENCY = 200 mV O(ripple) (BTL 100 1 k 10k f − Frequency − Hz Figure 22. ...

  • Page 12

    ... TPA3120D2 should be configured in a single-ended (SE) half-bridge amplifier. For mono applications, 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

    ... 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

    ... DC Blocking Capacitor (μ (–3 dB (–3 dB 680 1000 330 Product Folder Link(s): TPA3120D2 www.ti.com Equation further consideration for this capacitor (–3 dB) c 2200 470 1000 Copyright © 2007, Texas Instruments Incorporated ) form a ...

  • Page 15

    ... Power-Supply Decoupling The TPA3120D2 is a high-performance CMOS audio amplifier that requires adequate power-supply decoupling to ensure that the output total harmonic distortion (THD 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

    ... 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

    ... 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

    ... AVCC TPA3120 TPA3120 19 RIN AVCC 18 BYPASS GAIN0 17 AGND GAIN1 0. AGND BSR 15 PVCCR ROUT 14 VCLAMP PGNDR 13 PVCCR PGNDR 0 Product Folder Link(s): TPA3120D2 www.ti.com 470 VCC 0. 470 0. VCC 0. Copyright © ...

  • Page 19

    ... Copyright © 2007, Texas Instruments Incorporated SLOS507E – MARCH 2007 – REVISED SEPTEMBER 2007 , of the APA is normally in the hundreds of OUT Figure 29(b), which requires low-pass filters in most Product Folder Link(s): TPA3120D2 TPA3120D2 Submit Documentation Feedback 19 ...

  • Page 20

    ... Generator 20 Submit Documentation Feedback Power Supply APA (a) Basic Class-AB Power Supply L filt C Class-D APA filt (b) Traditional Class-D Figure 29. Audio Measurement Systems Product Folder Link(s): TPA3120D2 www.ti.com Analyzer kHz Analyzer kHz L Copyright © 2007, Texas Instruments Incorporated ...

  • Page 21

    ... 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 two pins are present; one is the signal and the other is ground. SE outputs have one pin driving a load through an output ac-coupling capacitor and the other end of the load is tied to ground ...

  • Page 22

    ... TPA3120D2 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

    ... TPA3120D2PWP ACTIVE TPA3120D2PWPG4 ACTIVE TPA3120D2PWPR ACTIVE TPA3120D2PWPRG4 ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design ...

  • Page 24

    ... TAPE AND REEL BOX INFORMATION Device Package Pins TPA3120D2PWPR PWP 24 PACKAGE MATERIALS INFORMATION Site Reel Reel A0 (mm) Diameter Width (mm) (mm) SITE 60 330 16 6.95 Pack Materials-Page 1 5-Oct-2007 B0 (mm) K0 (mm (mm) (mm) Quadrant 8.3 1 Pin1 Q1 ...

  • Page 25

    ... Device Package Pins TPA3120D2PWPR PWP PACKAGE MATERIALS INFORMATION Site Length (mm) Width (mm) 24 SITE 60 346.0 346.0 Pack Materials-Page 2 5-Oct-2007 Height (mm) 33.0 ...

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    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...