Texas Instruments TPA3122D2 User manual

FEATURES APPLICATIONS

DESCRIPTION

1 Fm

Mute Control

PVCCL

TPA3122D2

SIMPLIFIED APPLICATION CIRCUIT

PVCCR

VCLAMP

GAIN1

BYPASS

1 Fm

0.22 Fm

AGND

Left Channel

Right Channel

10 V to 30 V

}

4-Step Gain

Control

Shutdown

Control

LIN

RIN

BSR

BSL

PGNDR

PGNDL

0.22 Fm

22 Hm

0.68 Fm

470 Fm

0.68 Fm

1 Fm

470 Fm

GAIN0

AVCC

MUTE

ROUT

LOUT

TPA3122D2

SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007www.ti.com

15-W STEREO CLASS-D AUDIO POWER AMPLIFIER

•Televisions•10-W/ch into an 4- ΩLoad From a 17-V Supply•15-W/ch into an 8- ΩLoad From a 28-V Supply•Operates from 10 V to 30 V

The TPA3122D2 is a 15-W (per channel) efficient,•Efficient Class-D Operation

Class-D audio power amplifier for driving stereo•Four Selectable, Fixed Gain Settings

single ended speakers or mono bridge tied load. The•Internal Oscillator (No External Components

TPA3122D2 can drive stereo speakers as low as 4 Ω.Required) The efficiency of the TPA3122D2 eliminates the needfor an external heat sink when playing music.•Single Ended Analog Inputs

The gain of the amplifier is controlled by two gain•Thermal and Short-Circuit Protection with

select pins. The gain selections are 20, 26, 32, andAuto Recovery Feature

36 dB.•20-pin DIP Package

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2007, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.

www.ti.com

PVCCL

MUTE

LIN

RIN

BYPASS

AGND

PVCCR

VCLAMP

PGNDL

LOUT

BSL

AVCC

GAIN0

GAIN1

BSR

ROUT

PGNDR

TPA3122D2

SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foamduring storage or handling to prevent electrostatic damage to the MOS gates.

N (DIP) PACKAGE

(TOP VIEW)

TERMINAL FUNCTIONS

TERMINAL

I/O DESCRIPTION20-PINNAME

(DIP)

Shutdown signal for IC (low = disabled, high = operational). TTL logic levels with compliance toSD 2 I

AVCC.RIN 5 I Audio input for right channel.LIN 4 I Audio input for left channel.GAIN0 15 I Gain select least significant bit. TTL logic levels with compliance to AVCC.GAIN1 14 I Gain select most significant bit. TTL logic levels with compliance to AVCC.Mute signal for quick disable/enable of outputs (high = outputs switch at 50% duty cycle; low =MUTE 3 I

outputs enabled). TTL logic levels with compliance to AVCC.BSL 18 I/O Bootstrap I/O for left channel.PVCCL 1 Power supply for left channel H-bridge, not internally connected to PVCCR or AVCC.LOUT 19 O Class-D -H-bridge positive output for left channel.PGNDL 20 Power ground for left channel H-bridge.VCLAMP 9 Internally generated voltage supply for bootstrap capacitors.BSR 13 I/O Bootstrap I/O for right channel.ROUT 12 O Class-D -H-bridge negative output for right channel.PGNDR 11 Power ground for right channel H-bridge.PVCCR 10 Power supply for right channel H-bridge, not connected to PVCCL or AVCC.AGND 8 Analog ground for digital/analog cells in core.AGND 7 Analog Ground for analog cells in core.Reference for pre-amplifier inputs. Nominally equal to AVCC/8. Also controls start-up time viaBYPASS 6 O

external capacitor sizing.AVCC 16, 17 High-voltage analog power supply. Not internally connected to PVCCR or PVCCL

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ABSOLUTE MAXIMUM RATINGS

DISSIPATION RATINGS

RECOMMENDED OPERATING CONDITIONS

TPA3122D2

SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007

over operating free-air temperature range (unless otherwise noted)

(1)

VALUE UNIT

Supply voltage, AVCC, PVCC – 0.3 to 36 VV

Logic input voltage SD, MUTE, GAIN0, GAIN1 – 0.3 to V

+0.3 – 0.3 to V

+0.3 VV

Analog input voltage RIN, LIN – 0.3 to 7 VContinuous total power dissipation See Dissipation Rating TableT

Operating free-air temperature range – 40 to 85 °CT

Operating junction temperature range – 40 to 150 °CT

stg

Storage temperature range -65 to 150 °CR

Load resistance (Minimum value) 3.2 kVHuman body model (all pins) ± 2 kVESD Electrostatic Discharge

Charged-device model (all pins) ± 500 V

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratingsonly, and functional operations of the device at these or any other conditions beyond those indicated under recommended operatingconditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

PACKAGE

(1)

≤25 °C DERATING FACTOR T

= 70 °C T

= 85 °C

20-pin DIP 1.87 W 15 mW/ °C 1.20 W 0.97 W

(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TIWeb site at www.ti.com .

MIN MAX UNIT

Supply voltage PVCC, AVCC 10 30 VV

High-level input voltage SD, MUTE, GAIN0, GAIN1 2 VV

Low-level input voltage SD, MUTE, GAIN0, GAIN1 0.8 VSD, V

= V

, V

= 30 V 125I

High-level input current MUTE, V

= V

, V

= 30 V 125 µAGAIN0, GAIN1, V

= V

, V

= 24 V 125SD, V

= 0, V

= 30 V 1I

Low-level input current MUTE, V

= 0 V, V

= 30 V 1 µAGAIN0, GAIN1, V

= 0 V, V

= 24 V 1T

Operating free-air temperature – 40 85 °C

Product Folder Link(s) :TPA3122D2

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DC CHARACTERISTICS

AC CHARACTERISTICS

TPA3122D2

SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007

= 25 °C, V

= 24 V, R

= 4 Ω(unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Class-D output offset voltage| V

| V

= 0 V, A

= 36 dB 7.5 50 mV(measured differentially)V

(BYPASS)

Bypass output voltage No load AV

/8 VI

CC(q)

Quiescent supply current SD = 2 V, MUTE = 0 V, No load 23 37 mAI

CC(q)

Quiescent supply current in mute mode MUTE = 2 V, No load 23 mAI

CC(q)

Quiescent supply current in shutdown 1SD = 0.8 V , No load 0.39 mAmoder

DS(on)

Drain-source on-state resistance 200 m Ω

Gain0 = 0.8 V 18 20 22Gain1 = 0.8 V

Gain0 = 2 V 24 26 28G Gain dBGain0 = 0.8 V 30 32 34Gain1 = 2 V

Gain0 = 2 V 34 36 38Mute Attenuation V

= 1Vrms – 82

= 25 °C, V

= 24V, R

= 4 Ω(unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

= 12 V, V

ripple

= 200 mV

100 Hz – 30 dBK

SVR

Supply ripple rejection

Gain = 20 dB

1 kHz -48 dBV

= 12 V, R

= 4 Ω, f = 1 kHz 4Output Power at 1% THD+N

= 24 V, R

= 8 Ω, f = 1 kHz 8P

= 12 V, R

= 4 Ω, f = 1 kHz 5Output Power at 10%THD+N

= 24 V, R

= 8 Ω, f = 1 kHz 10R

= 4 Ω, f = 1 kHz, P

= 1 W 0.1%Total harmonic distortion +THD+N

noise

= 8 Ω, f = 1 kHz, P

= 1 W 0.06%

85 µVV

Output integrated noise floor 20 Hz to 22 kHz, A-weighted filter, Gain = 20 dB

– 80 dBCrosstalk P

= 1 W, f = 1kHz; Gain = 20 dB – 60 dBSNR Signal-to-noise ratio Max Output at THD+N < 1%, f = 1 kHz, Gain = 20 dB 99 dBThermal trip point 150 °CThermal hysteresis 30 °Cf

OSC

Oscillator frequency 10 V ≤V

230 250 270 kHzmute delay time from mute input switches high until outputs muted 120 msecΔt

unmute delay time from mute input switches low until outputs unmuted 120 msec

Product Folder Link(s) :TPA3122D2

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OSC/RAMP

MUTE

CONTROL

BYPASS

CONTROL

BIAS

THERMAL

DETECT

AVDD

AVCC

LIN

RIN

MUTE

BYPASS

GAIN1

GAIN0

BSL

PVCCL

LOUT

PGNDL

VCLAMP

BSR

PVCCR

ROUT

PGNDR

VCLAMP

AVDD

AVDD/2

AVDD

AVDD/2

REGULATOR

AGND

TPA3122D2

SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007

FUNCTIONAL BLOCK DIAGRAM

Product Folder Link(s) :TPA3122D2

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TYPICAL CHARACTERISTICS

f − Frequency − Hz

20 100 1k 20k

0.1

0.01

G001

Gain = 20 dB

RL= 4 Ω(SE)

VCC = 12 V

10k

THD+N − %

PO= 1 W PO= 0.5 W

PO= 2 W

f − Frequency − Hz

20 100 1k 20k

0.1

0.01

G002

Gain = 20 dB

RL= 4 Ω(SE)

VCC = 18 V

10k

THD+N − %

PO= 1 W

PO= 5 W

PO= 2.5 W

f − Frequency − Hz

20 100 1k 20k

0.1

0.01

G003

Gain = 20 dB

RL= 4 Ω(SE)

VCC = 24 V

10k

THD+N − %

PO= 1 W

PO= 5 W

PO= 2.5 W

f − Frequency − Hz

20 100 1k 20k

0.1

0.01

G004

Gain = 20 dB

RL= 8 Ω(SE)

VCC = 24 V

10k

THD+N − %

PO= 1 W

PO= 5 W

PO= 2.5 W

PO− Output Power − W

0.01 0.1 1 40

0.1

0.01

G005

THD+N − %

10 Gain = 20 dB

RL= 4 Ω(SE)

VCC = 12 V

VCC = 24 V

VCC = 18 V

PO− Output Power − W

0.01 0.1 1 40

0.1

0.01

G006

Gain = 20 dB

RL= 8 Ω(SE)

THD+N − %

VCC = 12 V

VCC = 24 V

VCC = 18 V

TPA3122D2

SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISEvs vsFREQUENCY (SE) FREQUENCY (SE)

Figure 1. Figure 2.

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISEvs vsFREQUENCY (SE) FREQUENCY (SE)

Figure 3. Figure 4.

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISEvs vsOUTPUT POWER (SE) OUTPUT POWER (SE)

Figure 5. Figure 6.

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−100

−80

−60

−40

−20

f − Frequency − Hz

Crosstalk − dB

G007

20 100 1k 20k10k

Gain = 20 dB

PO= 0.25 W

RL= 4 Ω (SE)

VCC = 18 V

Right to Left

Left to Right

−100

−80

−60

−40

−20

f − Frequency − Hz

Crosstalk − dB

G008

Gain = 20 dB

PO= 0.125 W

RL= 8 Ω (SE)

VCC = 18 V

20 100 1k 20k10k

Right to Left

Left to Right

f − Frequency − Hz

Gain − dBr A

G009

−200

200

400

Phase − °

100 1k 100k10k

Phase

Gain

−20

−40

VCC = 24 V

Gain = 20 dB

P = 0.125 W

Lfilt = 22 mH

Cfilt = 0.68 Fm

Cdc = 470 Fm

RL= 4 Ω (SE)

f − Frequency − Hz

Gain − dBr A

G010

−100

−200

−300

100

200

Phase − °

20 100 1k 200k10k

Phase

Gain

Gain = 20 dB

PO= 0.125 W

RL= 8 Ω (SE)

VCC = 18 V

Lfilt = 47 mH

Cfilt = 0.22 Fm

Cdc = 470 Fm

PVCC − Supply Voltage − V

10 12 14 16 18 20

PO− Output Power −W

G011

THD+N = 10%

THD+N = 1%

Gain = 20 dB

RL= 4 (SE)W

PVCC − Supply Voltage − V

10 12 14 16 18 20 22 24 26 28 30

PO− Output Power −W

G012

Gain = 20 dB

RL= 8 Ω (SE)

THD+N = 10%

THD+N = 1%

TPA3122D2

SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007

TYPICAL CHARACTERISTICS (continued)

CROSSTALK CROSSTALKvs vsFREQUENCY (SE) FREQUENCY (SE)

Figure 7. Figure 8.

GAIN/PHASE GAIN/PHASEvs vsFREQUENCY (SE) FREQUENCY (SE)

Figure 9. Figure 10.

OUTPUT POWER OUTPUT POWERvs vsSUPPLY VOLTAGE (SE) SUPPLY VOLTAGE (SE)

Figure 12.NOTE: Dashed line = Thermally limited

Figure 11.

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PO− Output Power − W

100

01234567

Efficiency − %

G013

Gain = 20 dB

RL= 4 Ω(SE)

VCC = 12 V

PO− Output Power − W

100

0 2 4 6 8 10 12 14

Efficiency − %

G014

Gain = 20 dB

RL= 8 Ω(SE)

VCC = 12 V

VCC = 18 V

VCC = 24 V

PO− Total Output Power − W

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

0 2 4 6 8 10 12 14

ICC − Supply Current − A

G015

Gain = 20 dB

RL= 4 Ω(SE)

VCC = 12 V

PO− Total Output Power − W

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0 2 4 6 8 10 12 14

ICC − Supply Current − A

G016

Gain = 20 dB

RL= 8 Ω(SE)

VCC = 18 V

VCC = 24 V

VCC = 12 V

−120

−100

−80

−60

−40

−20

f − Frequency − Hz

PSRR − dB

G017

Gain = 20 dB

RL= 4 Ω(SE)

VCC = 12 V

Vripple = 200 mVp-p

20 100 1k 20k10k

f − Frequency − Hz

0.1

0.01

0.001

G018

Gain = 20 dB

RL= 8 Ω (BTL)

VCC = 24 V

THD+N − %

PO= 20 W

PO= 1 W

PO= 5 W

TPA3122D2

SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007

TYPICAL CHARACTERISTICS (continued)

EFFICIENCY EFFICIENCYvs vsOUTPUT POWER (SE) OUTPUT POWER (SE)

Figure 13. Figure 14.

SUPPLY CURRENT SUPPLY CURRENTvs vsTOTAL OUTPUT POWER (SE) TOTAL OUTPUT POWER (SE)

Figure 15. Figure 16.

POWER SUPPLY REJECTION RATIO TOTAL HARMONIC DISTORTION + NOISEvs vsFREQUENCY (SE) FREQUENCY (BTL)

Figure 17. Figure 18.

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−30

−20

−10

f − Frequency − Hz

Gain − dBr A

G020

−400

−500

−600

−700

−300

−200

Phase − °

20 100 1k 200k10k

Phase

Gain

Gain = 20 dB

PO= 0.125 W

RL= 8 Ω (BTL)

VCC = 24 V

Lfilt = 33 mH

Cfilt = 1 Fm

PO− Output Power − W

0.1

0.01

0.001

G019

Gain = 20 dB

RL= 8 Ω(BTL)

THD+N − %

0.01 0.1 1 5010

VCC = 24 V

VCC = 18 V

VCC = 12 V

PVCC − Supply Voltage − V

10 12 14 16 18 20 22 24 26 28 30

PO− Output Power − W

G021

Gain = 20 dB

RL= 8 Ω(BTL)

THD+N = 10%

THD+N = 1%

PO− Output Power − W

100

0 4 8 12 16 20 24 28

Efficiency − %

G022

Gain = 20 dB

RL= 8 Ω(BTL)

VCC = 12 V

VCC = 18 V

VCC = 24 V

PO− Total Output Power − W

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

0 4 8 12 16 20 24 28

ICC − Supply Current − A

G023

Gain = 20 dB

RL= 8 Ω(BTL)

VCC = 24 V

VCC = 12 V

VCC = 18 V

−120

−100

−80

−60

−40

−20

f − Frequency − Hz

PSRR − dB

G024

Gain = 20 dB

RL= 8 Ω(BTL)

VCC = 24 V

Vripple = 200 mVp-p

20 100 1k 20k10k

TPA3122D2

SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007

TYPICAL CHARACTERISTICS (continued)

TOTAL HARMONIC DISTORTION + NOISE GAIN/PHASEvs vsOUTPUT POWER (BTL) FREQUENCY (BTL)

Figure 19. Figure 20.

OUTPUT POWER EFFICIENCYvs vsSUPPLY VOLTAGE (BTL) OUTPUT POWER (BTL)

Figure 21. Figure 22.

SUPPLY CURRENT POWER SUPPLY REJECTION RATIOvs vsTOTAL OUTPUT POWER (BTL) FREQUENCY (BTL)

Figure 23. Figure 24.

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APPLICATION INFORMATION

CLASS-D OPERATION

Traditional Class-D Modulation Scheme

0 V

-12 V

+12 V

Current

OUTP

Differential Voltage

Across Load

OUTN

0 V

Supply Pumping

Gain setting via GAIN0 and GAIN1 inputs

TPA3122D2

SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007

This section focuses on the class-D operation of the TPA3122D2.

The TPA3122D2 operates in AD mode. There are two main configurations that may be used. For stereooperation, the TPA3122D2 should be configured in a single-ended (SE) half bridge amplifier. For monoapplications, TPA3122D2 may be used as a bridge tied load (BTL) amplifier. The traditional class-D modulationscheme, which is used in the TPA3122D2 BTL configuration, has a differential output where each output is 180degrees out of phase and changes from ground to the supply voltage, V

. Therefore, the differential pre-filteredoutput varies between positive and negative V

, where filtered 50% duty cycle yields0 V across the load. The traditional class-D modulation scheme with voltage and current waveforms is shown inFigure 25 .

Figure 25. Traditional Class-D Modulation Scheme's Output Voltage and Current Waveforms into anInductive Load With No Input

One issue encountered in single-ended (SE) class-D amplifier designs is supply pumping. Power-supply pumpingis a rise in the local supply voltage due to energy being driven back to the supply by operation of the class-Damplifier. This phenomenon is most evident at low audio frequencies and when both channels are operating atthe same frequency and phase. At low levels, power-supply pumping results in distortion in the audio output dueto fluctuations in supply voltage. At higher levels, pumping can cause the overvoltage protection to operate,which temporarily shuts down the audio output.

Several things can be done to relieve power-supply pumping. The lowest impact is to operate the two inputs outof phase 180 °and reverse the speaker connections. Because most audio is highly correlated, this causes thesupply pumping to be out of phase and not as severe. If this is not enough, the amount of bulk capacitance onthe supply must be increased. Also, improvement is realized by hooking other supplies to this node, thereby,sinking some of the excess current. Power-supply pumping should be tested by operating the amplifier at lowfrequencies and high output levels.

The gain of the TPA3122D2 is set by two input terminals, GAIN0 and GAIN1.

The gains listed in Table 1 are realized by changing the taps on the input resistors and feedback resistors insidethe amplifier. This causes the input impedance (Z

) to be dependent on the gain setting. The actual gain settingsare controlled by ratios of resistors, so the gain variation from part-to-part is small. However, the input impedancefrom part-to-part at the same gain may shift by ± 20% due to shifts in the actual resistance of the input resistors.

Product Folder Link(s) :TPA3122D2

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