2.8-wstereo fully differential audio … supply voltage -0.3v to 6 v vi input voltage -0.3v to vdd +...

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FEATURES APPLICATIONS

DESCRIPTION

APPLICATION CIRCUIT

8 9 10

11

GND RS/D

GND LBYPASS

LO

UT-

NC

LV

DD

RV

DD

NC

NC

NC

RIN

+

LS

/DR

IN-

ROUT+ RBYPASS

ROUT- LIN-

LOUT+ LIN+

20-PIN QFN (RGW) PACKAGE(TOP VIEW)

76

12

13

14

15

1617181920

1

2

3

4

5

(See note A)

_

_

+

+

RVDD

ROUT+

LOUT+

ROUT-

LOUT-

GND 2, 5, Thermal Pad

LVDD

19

1

4

3

6

7

To Supply

To Supply

Bias

Circuitry

RIN-

LIN-

RIN+

LIN+

17

13

16

12

15

11

+

+

-

-

In From

In FromDAC

DAC

SHUTDOWN

RI

RI

RI

RI

14

9

C(RBYPASS)

C(LBYPASS)

100 kW100 kW

40 kW

40 kW

40 kW

40 kW

TPA6020A2

SLOS458B–JULY 2005–REVISED AUGUST 2005

2.8-W STEREO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER

• Notebook PCs• Ideal for Notebook PCs• LCD TVs• Fully Differential Architecture and High

PSRR (-80 dB) Provide Excellent RFRectification Immunity

• 2.8 W Into 3 Ω From a 5-V Supply at The TPA6020A2 is a 2.8-W stereo bridge-tied loadTHD = 10% (Typical) (BTL) amplifier designed to drive stereo speakers

with at least 3-Ω impedance. The device operates• Very Low Crosstalk:from 2.5 V to 5.5 V, drawing only 8 mA of quiescent

– -100 dB Typical at 5 V, 3 Ω supply current. The feedback resistors are internal,• 2.5-V to 5.5-V Operating Range allowing the gain to be set with only two input

resistors per channel. The amplifier's fully differential• Low Supply Current:architecture performs with -80 dB of power supply– 8 mA Typical at 5 V rejection from 20 Hz to 2 kHz, improved RF rectifi-

– Shutdown Current: 80-nA Typical cation immunity, small PCB area, and a fast startuptime with minimal pop, making the TPA6020A2 ideal• Fast Startup (27 ms) With Minimal Popfor notebook PC applications.• Internal Feedback Resistors Reduce

Component Count• Thermally Enhanced QFN Packaging

A. C(LBYPASS) and C(RBYPASS) are optional.

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

PRODUCTION DATA information is current as of publication date. Copyright © 2005, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.

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ABSOLUTE MAXIMUM RATINGS

PACKAGE DISSIPATION RATINGS

RECOMMENDED OPERATION CONDITIONS

TPA6020A2


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

ORDERING INFORMATION

PACKAGED DEVICES (1) (2)

TA EVALUATION MODULESQFN(RGW)

-40°C to 85°C TPA6020A2RGW TPA6020A2EVM

(1) The RGW is available taped and reeled. To order taped and reeled parts, add the suffix R to the partnumber (TPA6020A2RGWR).

(2) For the most current package and ordering information, see the Package Option Addendum at the endof this document, or see the TI website at www.ti.com.

over operating free-air temperature range unless otherwise noted (1)

UNIT

VDD Supply voltage -0.3 V to 6 V

VI Input voltage -0.3 V to VDD + 0.3 V

Continuous total power dissipation See Dissipation Rating Table

TA Operating free-air temperature -40°C to 85°C

TJ Junction temperature -40°C to 150°C

Tstg Storage temperature -65°C to 85°C

Lead temperature 1,6 mm (1/16 Inch) from case for 10 seconds 260°C

Human body model (2) (all pins) ±2 kVElectrostatic discharge

Charged-device model (3) (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 operation 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.

(2) In accordance with JEDEC Standard 22, Test Method A114-B.(3) In accordance with JEDEC Standard 22, Test Method C101-A

TA 25°C DERATING TA= 70°C TA= 85°CPACKAGE POWER RATING FACTOR (1) POWER RATING POWER RATING

RGW 2.99 W 23.98 mW/°C 1.92 W 1.56 W

(1) Derating factor based on high-k board layout.

MIN TYP MAX UNIT

VDD Supply voltage 2.5 5.5 V

VIH High-level input voltage SHUTDOWN 1.55 V

VIL Low-level input voltage SHUTDOWN 0.5 V

TA Operating free-air temperature -40 85 °C

2

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ELECTRICAL CHARACTERISTICS

38 kRI

40 kRI

42 kRI

TPA6020A2


TA = 25°C

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Output offset voltage (measuredVOS VI = 0 V differential, Gain = 1 V/V, VDD = 5.5 V -9 0.3 9 mVdifferentially)

PSRR Power supply rejection ratio VDD = 2.5 V to 5.5 V -85 dB

VIC Common-mode input range VDD = 2.5 V to 5.5 V 0.5 VDD-0.8 V

VDD = 5.5 V, VIC = 0.5 V to 4.7 V -63CMRR Common-mode rejection ratio dB

VDD = 2.5 V, VIC = 0.5 V to 1.7 V -63

VDD = 5.5 V 0.55RL = 3 Ω, Gain = 1 V/V,Low-output swing VIN+ = VDD, VIN- = 0 V or VDD = 3.6 V 0.42 V

VIN+ = 0 V, VIN- = VDD VDD = 2.5 V 0.34 0.4

VDD = 5.5 V 4.9RL = 3 Ω, Gain = 1 V/V,High-output swing VIN+ = VDD, VIN- = 0 V or VDD = 3.6 V 3.1 V

VIN- = VDD VIN+ = 0 V VDD = 2.5 V 1.9 2.1

| IIH | High-level input current, shutdown VDD = 5.5 V, VI = 5.8 V 58 100 µA

| IIL | Low-level input current, shutdown VDD = 5.5 V, VI = -0.3 V 3 100 µA

IQ Quiescent current VDD = 2.5 V to 5.5 V, no load 8 9.8 mA

V(SHUTDOWN) ≤ 0.5 V, VDD = 2.5 V to 5.5 V,I(SD) Supply current 0.08 1 µARL = 3 Ω

Gain RL = 3 Ω V/V

Resistance from shutdown to GND 100 kΩ

3

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OPERATING CHARACTERISTICS

TPA6020A2


TA = 25°C, Gain = 2 V/V

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

VDD = 5 V 2.15

THD + N= 1%, f = 1 kHz, RL = 3 Ω VDD = 3.6 V 1.08

VDD = 2.5 V 0.43

VDD = 5 V 1.94

PO Output power THD + N= 1%, f = 1 kHz, RL = 4 Ω VDD = 3.6 V 1.00 W

VDD = 2.5 V 0.41

VDD = 5 V 1.27

THD + N= 1%, f = 1 kHz, RL = 8 Ω VDD = 3.6 V 0.65

VDD = 2.5 V 0.29

PO = 2 W VDD = 5 V 0.09%

f = 1 kHz, RL = 3 Ω PO = 1 W VDD = 3.6 V 0.20%

PO = 300 mW VDD = 2.5 V 0.08%

PO = 1.8 W VDD = 5 V 0.08%Total harmonic distortion plusTHD+N f = 1 kHz, RL = 4 Ω PO = 0.7 W VDD = 3.6 V 0.07%noise

PO = 300 mW VDD = 2.5 V 0.12%

PO = 1 W VDD = 5 V 0.05%

f = 1 kHz, RL = 8 Ω PO = 0.5 W VDD = 3.6 V 0.06%

PO = 200 mW VDD = 2.5 V 0.06%

f = 217 Hz -80VDD = 3.6 V, Inputs ac-grounded withkSVR Supply ripple rejection ratio dBCI = 2 µF, V(RIPPLE) = 200 mVpp f = 20 Hz to 20 kHz -70

Crosstalk VDD = 5 V, RL = 3 Ω, f = 20 Hz to 20 kHz, Po = 1 W -100 dB

SNR Signal-to-noise ratio VDD = 5 V, PO = 2 W, RL = 3 Ω, Gain = 1 V/V 104 dB

VDD = 3.6 V, f = 20 Hz to 20 kHz, No weighting 15Vn Output voltage noise Gain = 1 V/V µVRMS

A weighting 12Inputs ac grounded with CI = 0.22 µF

CMRR Common-mode rejection ratio VDD = 3.6 V, VIC = 200 mVpp f = 217 Hz -65 dB

ZI Input impedance 38 40 42 kΩ

VDD = 3.6 V, No CBYPASS 4 µsStart-up time from shutdown

VDD = 3.6 V, CBYPASS = 0.1 µF 27 ms

4

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TPA6020A2


Terminal Functions

TERMINALI/O DESCRIPTION

NAME NO.

ROUT+ 1 O Right channel positive BTL output

GND 2,5 I High current ground

ROUT- 3 O Right channel negative BTL output

LOUT+ 4 O Left channel positive BTL output

LOUT- 6 O Left channel negative BTL output

LVDD 7 I Left channel power supply. Must be tied to RVDD for stereo operation.

NC 8, 10, 18, 20 – No internal connection.

LS/D 9 I Left channel shutdown terminal (active low logic)

LBYPASS 11 – Left channel mid-supply voltage. Adding a bypass capacitor improves PSRR

LIN+ 12 I Left channel positive differential input

LIN- 13 I Left channel negative differential input

RS/D 14 – Right channel shutdown terminal (active low logic)

RBYPASS 15 – Right channel mid-supply voltage. Adding a bypass capacitor improves PSRR

RIN+ 16 I Right channel positive differential input

RIN- 17 I Right channel negative differential input

RVDD 19 I Power supply

Connect to ground. Thermal pad must be soldered down in all applications to properly secureThermal Pad – – device on the PCB.

5

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TYPICAL CHARACTERISTICS

Table of Graphs

1.5

0

2

0.5

2.5

1

3

3 8 13 18 23

R - Load Resistance -L W

P-

Ou

tpu

t P

ow

er

- W

O

f = 1 kHzGain = 2 V/V

V = 2.5 V, THD+N = 10%DD

V = 3.6 V, THD+N = 10%DD

V = 5 V, THD+N = 1%DD

V = 3.6 V, THD+N = 1%DD

3228

V = 5 V, THD+N = 10%DD

V = 2.5 V, THD+N = 1%DD

1.5

0

2

0.5

2.5

1

3

2.5 3 3.5 4 4.5

V - Supply Voltage - VDD

P-

Ou

tpu

t P

ow

er

- W

O


5

R = 3 , THD+N = 10%L W

R = 4 , THD+N = 10%L W

R = 3 , THD+N = 1%L W

R = 4 , THD+N = 1%L W

R = 8 , THD+N = 10%L W

R = 8 , THD+N = 1%L W

TPA6020A2


FIGURE

vs Supply voltage 1PO Output power

vs Load resistance 2

PD Power dissipation vs Output power 3, 4

vs Output power 5, 6, 7THD+N Total harmonic distortion + noise

vs Frequency 8, 9, 10, 11, 12, 13

Crosstalk vs Frequency 14

KSVR Supply voltage rejection ratio vs Frequency 15, 16, 17, 18

GSM power supply rejection vs Time 19

GSM power supply rejection vs Frequency 20

vs Frequency 21CMRR Common-mode rejection ratio

vs Common-mode input voltage 22

Closed-loop gain/phase vs Frequency 23

Open-loop gain/phase vs Frequency 24

Start-up time vs Bypass capacitor 25

OUTPUT POWER OUTPUT POWERvs vs

SUPPLY VOLTAGE LOAD RESISTANCE

Figure 1. Figure 2.

6

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1.5

2

0.5

2.5

3.5

1

0

3

0 0.5 1 1.5 2

P - Output Power (Per Channel) - WO

P-

Po

we

r D

iss

ipa

tio

n -

WD

32.5

V = 5 V

StereoDD

3 W

4 W

8 W

0.8

1

0.2

0.4

0.6

1.2

1.6

1.8

2

0

1.4

0 0.2 0.4 0.6 0.8 1

P - Output Power (Per Channel) - WO

1.4 1.61.2

V = 3.6 V

StereoDD

3 W

4 W

8 WP-

Po

we

r D

iss

ipa

tio

n -

WD

0.01

0.1

1

10

0.01 2 30.1 1

TH

D+

N -

To

tal

Ha

rmo

nic

Dis

tort

ion

+ N

ois

e -

%

PO - Output Power - W

R = 3


C = 0 to 1 F

L

(Bypass)

W

m

5 V

2.5 V

3.6 V

0.01

0.1

1

10

0.01 2 30.1 1

TH

D+

N -

To

tal

Ha

rmo

nic

Dis

tort

ion

+ N

ois

e -

%


2.5 V

5 V

3.6 V

R = 4


C = 0 to 1 F

L

(Bypass)

W

m

TPA6020A2


POWER DISSIPATION POWER DISSIPATIONvs vs

OUTPUT POWER OUTPUT POWER

Figure 3. Figure 4.

TOTAL HARMONIC DISTORTION + NOISE TOTAL HARMONIC DISTORTION + NOISEvs vs

OUTPUT POWER OUTPUT POWER

Figure 5. Figure 6.

7

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0.01

0.1

1

10

20 20 k100 1 k 10 k

TH

D+

N -

To

tal

Ha

rmo

nic

Dis

tort

ion

+ N

ois

e -

%f - Frequency - Hz

P = 2 WO

P = 1 WO

V = 5 V

R = 3

Gain = 2 V/V

C = 0.22 F

DD

L

I

W

m

0.01

0.1

1

10

0.01 2 30.1 1

TH

D+

N -

To

tal

Ha

rmo

nic

Dis

tort

ion

+ N

ois

e -

%


2.5 V

5 V

R = 8


C = 0 to 1 F

L

(Bypass)

W

m

3.6 V

0.01

0.1

1

10

20 20 k100 1 k 10 k

TH

D+

N -

To

tal

Ha

rmo

nic

Dis

tort

ion

+ N

ois

e -

%

f - Frequency - Hz

P = 1.6 WO

P = 1 WO

V = 5 V

R = 4

Gain = 2 V/V

C = 0.22 F

DD

L

I

W

m

0.01

0.1

1

10

20 20 k100 1 k 10 k

TH

D+

N -

To

tal

Ha

rmo

nic

Dis

tort

ion

+ N

ois

e -

%

f - Frequency - Hz

P = 0.5 WO

P = 1 WO

V = 5 V

R = 8

Gain = 2 V/V

C = 0.22 F

DD

L

I

W

m

TPA6020A2



OUTPUT POWER FREQUENCY

Figure 7. Figure 8.


FREQUENCY FREQUENCY

Figure 9. Figure 10.

8

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0.01

0.1

1

10

20 20 k100 1 k 10 k

TH

D+

N -

To

tal

Ha

rmo

nic

Dis

tort

ion

+ N

ois

e -

%

f - Frequency - Hz

V = 3.6 V

R = 4

Gain = 2 V/V

C = 0.22 F

DD

L

I

W

m

P = 800 mWO

P = 500 mWO

P = 100 mWO

0.01

0.1

1

10

20 20 k100 1 k 10 k

TH

D+

N -

To

tal

Ha

rmo

nic

Dis

tort

ion

+ N

ois

e -

%f - Frequency - Hz

V = 3.6 V

R = 8

Gain = 2 V/V

C = 0.22 F

DD

L

I

W

m

P = 250 mWO

P = 500 mWO

P = 100 mWO

0.01

0.1

1

10

20 20 k100 1 k 10 k

TH

D+

N -

To

tal

Ha

rmo

nic

Dis

tort

ion

+ N

ois

e -

%

f - Frequency - Hz

V = 2.5 V

R = 4

Gain = 2 V/V

C = 0.22 F

DD

L

I

W

m

P = 250 mWO

P = 100 mWO

20 20 k100 1 k 10 k

f - Frequency - Hz

0

-20

-40

-60

-80

-100

-120

-140

Cro

ss

talk

- d

B

V = 5 V

R = 3

Gain = 2 V/V

DD

L W

P = 2 WO

P = 1 WO

TPA6020A2



FREQUENCY FREQUENCY


TOTAL HARMONIC DISTORTION + NOISE CROSSTALKvs vs

FREQUENCY FREQUENCY


9

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f - Frequency - Hz

+0

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

20 20k50 100 200 500 1k 2k 5k 10k

kS

VR

- Su

pp

ly V

olta

ge

Rej

ectio

n R

atio

- d

B

VDD = 3.6 VVDD = 2.5 V

RL = 4 Ω,,C(BYPASS) = 0.47 µF,Gain = 5 V/V,CI = 2 µF,Inputs ac Grounded

VDD = 5 V

f - Frequency - Hz

+0

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

20 20k50 100 200 500 1k 2k 5k 10k

kS

VR

- Su

pp

ly V

olta

ge

Rej

ectio

n R

atio

- d

B

VDD = 3.6 VVDD = 2.5 V

VDD = 5 V

RL = 4 Ω,,C(BYPASS) = 0.47 µF,Gain = 1 V/V,CI = 2 µF,Inputs ac Grounded

kS

VR

− S

up

ply

Vo

ltag

e R

ejec

tion

Rat

io −

dB

f − Frequency − Hz

+0

−100

−90

−80

−70

−60

−50

−40

−30

−20

−10

20 20k50 100 200 500 1k 2k 5k 10k

RL = 4 Ω,,CI = 2 µF,Gain = 1 V/V,VDD = 3.6 V

C(BYPASS) = 0.47 µFC(BYPASS) = 1 µF

C(BYPASS) = 0.1 µF

No C(BYPASS)

f - Frequency - Hz

+0

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

20 20k50 100 200 500 1k 2k 5k 10k

kS

VR

- Su

pp

ly V

olta

ge

Rej

ectio

n R

atio

- d

B RL = 4 Ω,,C(BYPASS) = 0.47 µF,CI = 2 µF,VDD = 2.5 V to 5 VInputs Floating

TPA6020A2


SUPPLY VOLTAGE REJECTION RATIO SUPPLY VOLTAGE REJECTION RATIOvs vs

FREQUENCY FREQUENCY


SUPPLY RIPPLE REJECTION RATIO SUPPLY VOLTAGE REJECTION RATIOvs vs

FREQUENCY FREQUENCY


10

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-180

-160

-140

-120

-100

0 400 800 1200 1600 2000

-150

-100

-50

0

f - Frequency - Hz

Vo

ltag

e -

dB

VD

D-

Su

pp

ly V

V Shown in Figure 19,

R = 8 , C = 2.2 F,

Inputs Grounded

DD

L IW m

Vo

lta

ge

- d

BV

O-

Ou

tpu

t V

C(BYPASS) = 0.47 Fm

C1

Frequency

217 Hz

C1 - Duty

20%

C1 Pk-Pk

500 mV

Ch1 100 mV/divCh4 10 mV/div

2 ms/div

VDD

VOUT

Vo

lta

ge

- V

t - T ime - ms

R = 8

C = 2.2 F

L

I

W

m

C = 0.47 F(BYPASS) m

f - Frequency - Hz

+0

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

20 20k50 100 200 500 1k 2k 5k 10k

CM

RR

- C

om

mo

n-M

od

e R

ejec

tion

Rat

io -

dB

VDD = 2.5 V

RL = 4 Ω,,VIC = 200 mV Vp-p,Gain = 1 V/V,

VDD = 5 V

-120

-80

-100

-60

-40

-20

0

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

VDD = 5 V

VDD = 2.5 VVDD = 3.6 V

VIC - Common Mode Input Voltage - V

CM

RR

- C

om

mo

n M

od

e R

eje

cti

on

Ra

tio

- d

B

R = 4 ,

Gain = 1 V/V,L W

dc Change in VIC

TPA6020A2


GSM POWER SUPPLY REJECTION GSM POWER SUPPLY REJECTIONvs vs

TIME FREQUENCY


COMMON MODE REJECTION RATIO COMMON-MODE REJECTION RATIOvs vs

FREQUENCY COMMON-MODE INPUT VOLTAGE


11

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-80

-70

-60

-50

-40

-30

-20

-10

0

10

20

30

40

-180-150

-120

-90

-60

-30

0

30

60

90

120

150

180

1 100 10 k 100 k 1 M 10 M1 kf - Frequency - Hz

Gai

n -

dB

Ph

ase

- Deg

reesGain

Phase

VDD = 5 VRL = 8 ΩAV = 1

10−40

−30

−20

−100

10

20

30

40

50

60

70

80

90

100

−180

−150

−120

−90

−60

−30

0

30

60

90

120

150

180VDD = 5 V,RL = 8 Ω

Gain

Phase

100 1 k 10 k 100 k 1 Mf − Frequency − Hz

Ph

ase

− D

egre

es

Gai

n −

dB

0

50

100

150

200

250

300

0 0.2 0.4 0.6 0.8 1C(Bypass) - Bypass Capacitor - µF

Sta

rt-U

p T

ime

- ms

TPA6020A2


CLOSED-LOOP GAIN/PHASE OPEN-LOOP GAIN/PHASEvs vs

FREQUENCY FREQUENCY


START-UP TIMEvs

BYPASS CAPACITOR

Figure 25.

12

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APPLICATION INFORMATION

STEREO OPERATION

Bypass Capacitor Configuration

VDD and Decoupling Capacitors

FULLY DIFFERENTIAL AMPLIFIER

APPLICATION SCHEMATICS

Advantages of Fully Differential Amplifiers

TPA6020A2


DAC has a lower mid-supply voltage than that ofthe TPA6020A2, the common-mode feedbackcircuit compensates, and the outputs are still

The TPA6020A2 is a stereo amplifier that can be biased at the mid-supply point of the TPA6020A2.operated in either a mono or stereo configuration. The inputs of the TPA6020A2 can be biased fromEach channel has independent shutdown control, 0.5 V to VDD - 0.8 V. If the inputs are biasedgiving the user greater flexibility. outside of that range, input-coupling capacitors

are required.• Mid-supply bypass capacitor, C(BYPASS), not

If Bypass capacitors are used, it is necessary to use required: The fully differential amplifier does notseparate bypass capacitors for each bypass pin. (See require a bypass capacitor. Any shift in thethe section entitled Bypass Capacitor (CBYPASS) and mid-supply voltage affects both positive andStart-Up Time) negative channels equally, thus canceling at the

differential output. Removing the bypass capaci-tor slightly worsens power supply rejection ratio(kSVR), but a slight decrease of kSVR may beEach VDD pin must have a separate power supply acceptable when an additional component can bedecoupling capacitor (see section entitled Decoupling eliminated (see Figure 18).Capacitor (CS)). A single, bulk decoupling capacitor is

• Better RF-immunity: GSM handsets save poweralso recommended. Additionally, the left and rightby turning on and shutting off the RF transmitterchannel VDD pins must be tied together on the PCB.at a rate of 217 Hz. The transmitted signal ispicked up on input and output traces. The fullydifferential amplifier cancels the signal much

The TPA6020A2 is a fully differential amplifier with better than the typical audio amplifier.differential inputs and outputs. The fully differentialamplifier consists of a differential amplifier and acommon-mode amplifier. The differential amplifier

Figure 26 through Figure 29 show application sche-ensures that the amplifier outputs a differential volt-matics for differential and single-ended inputs. Typicalage that is equal to the differential input times thevalues are shown in Table 1.gain. The common-mode feedback ensures that the

common-mode voltage at the output is biased aroundTable 1. Typical Component ValuesVDD/2 regardless of the common-mode voltage at the

input. COMPONENT VALUE

RI 40 kΩ

C(BYPASS)(1) 0.22 µF

• Input coupling capacitors not required: A fullyCS 1 µFdifferential amplifier with good CMRR, like theCI 0.22 µFTPA6020A2, allows the inputs to be biased at

voltage other than mid-supply. For example, if a (1) C(BYPASS) is optional.

13

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_

_

+

+

RVDD

ROUT+

LOUT+

ROUT-

LOUT-


LVDD

19

1

4

3

6

7

To Supply

To Supply

Bias

Circuitry

RIN-

LIN-

RIN+

LIN+

17

13

16

12

15

11

+

+

-

-

In From

In FromDAC

DAC

SHUTDOWN

RI

RI

RI

RI

14

9

C(RBYPASS)

C(LBYPASS)

100 kW100 kW

40 kW

40 kW

40 kW

40 kW

(See note A)

_

_

+

+

RVDD

ROUT+

LOUT+

ROUT-

LOUT-


LVDD

19

1

4

3

6

7

To Supply

To Supply

Bias

Circuitry

RIN-

LIN-

RIN+

LIN+

17

13

16

12

15

11

+

+

-

-

SHUTDOWN

RI

RI

CI

CI

CI

CI

RI

RI

14

9

C(RBYPASS)

C(LBYPASS)

100 kW100 kW

40 kW

40 kW

40 kW

40 kW

(See note A)

_

_

+

+

RVDD

ROUT+

LOUT+

ROUT-

LOUT-


LVDD

19

1

4

3

6

7

To Supply

To Supply

Bias

Circuitry

RIN-

LIN-

RIN+

LIN+

17

13

16

12

15

11

IN

IN

SHUTDOWN

RI

RI

RI

RI

14

9

C(RBYPASS)

C(LBYPASS)

100 kW100 kW

40 kW

40 kW

40 kW

40 kW

CI

CI

CI

CI

(See note A)

TPA6020A2



Figure 26. Typical Differential Input Application Schematic

A. C(LBYPASS) and C(RBYPASS) are optional.A. C(LBYPASS) and C(RBYPASS) are optional.

Figure 27. Differential Input ApplicationFigure 28. Single-Ended Input ApplicationSchematic Optimized With Input Capacitors

Schematic

14

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_

_

+

+

RVDD

ROUT+

LOUT+

ROUT-

LOUT-


LVDD

19

1

4

3

6

7

To Supply

To Supply

Bias

Circuitry

RIN-

LIN-

RIN+

LIN+

17

13

16

12

15

11

+

+

-

-

SHUTDOWN

RI

RI

Ra

Ra

CI

CF

CF

CF

CF

Ca

Ca

Ca

Ca

CI

CI

CI

RI

Ra

Ra

RI

14

9

C(RBYPASS)

C(LBYPASS)

100 kW100 kW

40 kW

40 kW

40 kW

40 kW

(See note A)

Selecting Components

Gain = RF/RI (1)

TPA6020A2



Figure 29. Differential Input ApplicationSchematic With Input Bandpass Filter

Bypass Capacitor (CBYPASS) and Start-Up Time

The internal voltage divider at the BYPASS pin of thisResistors (RI) device sets a mid-supply voltage for internal refer-

ences and sets the output common-mode voltage toThe input resistor (RI) can be selected to set the gainVDD/2. Adding a capacitor filters any noise into thisof the amplifier according to Equation 1.pin, increasing kSVR. C(BYPASS)also determines the risetime of VO+ and VO- when the device exits shutdown.The larger the capacitor, the slower the rise time.The internal feedback resistors (RF) are trimmed to

40 kΩ.Input Capacitor (CI)

Matching input resistors are important to fully differen-The TPA6020A2 does not require input couplingtial amplifier applications. Resistor matching has acapacitors when driven by a differential input sourcesignificant impact on CMRR and PSRR. If the inputbiased from 0.5 V to VDD - 0.8 V. Use 1% toleranceresistor values are poorly matched, then the CMRRor better gain-setting resistors if not using in-and PSRR performance is diminished. Therefore,put-coupling capacitors.1%-tolerance resistors or better are recommended to

optimize performance.

15

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fc(LPF) 1

2RFCFwhere RF is the internal 40 k resistor

(4)

fc 1

2RICI (2)fc(LPF)

12 40 k CF (5)

CF 1

2 40 k fc(LPF) (6)

-3 dB

fc

fc(HPF) 1

2RICIwhere RI is the input resistor

(7)

fc(HPF) 1

2 10 k CI (8)CI 1

2RIfc (3)

CI 1

2 10 k fc(HPF) (9)

fc(LPF) 1

2 Ra Ca (10)

TPA6020A2


Step 1: Low-Pass FilterIn the single-ended input application, an input capaci-tor, CI, is required to allow the amplifier to bias theinput signal to the proper dc level. In this case, CI andRI form a high-pass filter with the corner frequencydefined in Equation 2.

Therefore,

Substituting 10 kHz for fc(LPF) and solving for CF:

CF = 398 pF

Step 2: High-Pass Filter

The value of CI is an important consideration. Itdirectly affects the bass (low frequency) performance Because the application in this case requires a gainof the circuit. Consider the example where RI is of 4 V/V, RI must be set to 10 kΩ.10 kΩ and the specification calls for a flat bass

Substituting RI into Equation 6.response down to 100 Hz. Equation 2 is reconfiguredas Equation 3.

Therefore,In this example, CI is 0.16 µF, so the likely choiceranges from 0.22 µF to 0.47 µF. Ceramic capacitorsare preferred because they are the best choice inpreventing leakage current. When polarized capaci- Substituting 100 Hz for fc(HPF) and solving for CI:tors are used, the positive side of the capacitor faces

CI = 0.16 µFthe amplifier input in most applications. The input dclevel is held at VDD/2, typically higher than the source At this point, a first-order band-pass filter has beendc level. It is important to confirm the capacitor created with the low-frequency cutoff set to 100 Hzpolarity in the application. and the high-frequency cutoff set to 10 kHz.

The process can be taken a step further by creating aBand-Pass Filter (Ra, Ca, and Ca)second-order high-pass filter. This is accomplished by

It may be desirable to have signal filtering beyond the placing a resistor (Ra) and capacitor (Ca) in the inputone-pole high-pass filter formed by the combination of path. It is important to note that Ra must be at leastCI and RI. A low-pass filter may be added by placing 10 times smaller than RI; otherwise its value has aa capacitor (CF) between the inputs and outputs, noticeable effect on the gain, as Ra and RI are informing a band-pass filter. series.An example of when this technique might be used

Step 3: Additional Low-Pass Filterwould be in an application where the desirablepass-band range is between 100 Hz and 10 kHz, with Ra must be at least 10X smaller than RI,a gain of 4 V/V. The following equations illustrate how Set Ra = 1 kΩthe proper values of CF and CI can be determined.

Therefore,

16

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Ca 1

2 1kΩ fc(LPF) (11)

V(rms) VO(PP)

2 2

Power V(rms)

2

RL (12)

9 dB

fc(HPF) = 100 Hz

12 dB

AV

+20 dB/dec

−40 dB/dec

−20 dB/dec

ffc(LPF) = 10 kHz

RL2x VO(PP)

VO(PP)

-VO(PP)

VDD

VDD

USING LOW-ESR CAPACITORS

DIFFERENTIAL OUTPUT VERSUS

TPA6020A2


benefits to this configuration is power to the load. Thedifferential drive to the speaker means that as oneside is slewing up, the other side is slewing down,and vice versa. This in effect doubles the voltageSubstituting 10 kHz for fc(LPF) and solving for Ca:swing on the load as compared to a

Ca = 160 pF ground-referenced load. Plugging 2X VO(PP) into thepower equation, where voltage is squared, yields 4XFigure 30 is a bode plot for the band-pass filter in thethe output power from the same supply rail and loadprevious example. Figure 29 shows how to configureimpedance Equation 12.the TPA6020A2 as a band-pass filter.

Figure 30. Bode Plot

Decoupling Capacitor (CS)

The TPA6020A2 is a high-performance CMOS audioamplifier that requires adequate power supply de-coupling to ensure the output total harmonic distortion(THD) is as low as possible. Power-supply decouplingalso prevents oscillations for long lead lengths be-tween the amplifier and the speaker. For higherfrequency transients, spikes, or digital hash on theline, a good low equivalent-series-resistance (ESR)ceramic capacitor, typically 0.1 µF to 1 µF, placed as Figure 31. Differential Output Configurationclose as possible to the device VDD lead works best.For filtering lower frequency noise signals, a 10-µF or

In a typical wireless handset operating at 3.6 V,greater capacitor placed near the audio power ampli-bridging raises the power into an 8-Ω speaker from afier also helps, but is not required in most applicationssingled-ended (SE, ground reference) limit ofbecause of the high PSRR of this device.200 mW to 800 mW. This is a 6-dB improvement insound power—loudness that can be heard. In ad-dition to increased power, there are fre-

Low-ESR capacitors are recommended throughout quency-response concerns. Consider thethis applications section. A real (as opposed to ideal) single-supply SE configuration shown in Figure 32. Acapacitor can be modeled simply as a resistor in coupling capacitor (CC) is required to block theseries with an ideal capacitor. The voltage drop dc-offset voltage from the load. This capacitor can beacross this resistor minimizes the beneficial effects of quite large (approximately 33 µF to 1000 µF) so itthe capacitor in the circuit. The lower the equivalent tends to be expensive, heavy, occupy valuable PCBvalue of this resistance the more the real capacitor area, and have the additional drawback of limitingbehaves like an ideal capacitor. low-frequency performance. This frequency-limiting

effect is due to the high-pass filter network createdwith the speaker impedance and the coupling capaci-

SINGLE-ENDED OUTPUT tance. This is calculated with Equation 13.

Figure 31 shows a Class-AB audio power amplifier(APA) in a fully differential configuration. TheTPA6020A2 amplifier has differential outputs drivingboth ends of the load. One of several potential

17

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fc 1

2RLCC (13)

V(LRMS)

VO

IDD

IDD(avg)

RLCC

VO(PP)

VO(PP)

VDD

-3 dB

fc

FULLY DIFFERENTIAL AMPLIFIER

TPA6020A2


output. The total voltage drop can be calculated bysubtracting the RMS value of the output voltage fromVDD. The internal voltage drop multiplied by the

For example, a 68-µF capacitor with an 8-Ω speaker average value of the supply current, IDD(avg), deter-would attenuate low frequencies below 293 Hz. The mines the internal power dissipation of the amplifier.BTL configuration cancels the dc offsets, which elim-

An easy-to-use equation to calculate efficiency startsinates the need for the blocking capacitors.out as being equal to the ratio of power from theLow-frequency performance is then limited only bypower supply to the power delivered to the load. Tothe input network and speaker response. Cost andaccurately calculate the RMS and average values ofPCB space are also minimized by eliminating thepower in the load and in the amplifier, the current andbulky coupling capacitor.voltage waveform shapes must first be understood(see Figure 33).

Figure 33. Voltage and Current Waveforms forBTL Amplifiers

Figure 32. Single-Ended Output and Frequency Although the voltages and currents for SE and BTLResponse are sinusoidal in the load, currents from the supply

are different between SE and BTL configurations. InIncreasing power to the load does carry a penalty of an SE application the current waveform is aincreased internal power dissipation. The increased half-wave rectified shape, whereas in BTL it is adissipation is understandable considering that the full-wave rectified waveform. This means RMS con-BTL configuration produces 4X the output power of version factors are different. Keep in mind that forthe SE configuration. most of the waveform both the push and pull transis-

tors are not on at the same time, which supports thefact that each amplifier in the BTL device only drawscurrent from the supply for half the waveform. TheEFFICIENCY AND THERMAL INFORMATIONfollowing equations are the basis for calculating

Class-AB amplifiers are inefficient, primarily because amplifier efficiency.of voltage drop across the output-stage transistors.The two components of this internal voltage drop arethe headroom or dc voltage drop that varies inverselyto output power, and the sine wave nature of the

18

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Efficiency of a BTL amplifier PL

PSUP

Where:

PL VLrms2

RL, and VLRMS

VP2

, therefore, PL VP

2

2RL

PL = Power delivered to loadPSUP = Power drawn from power supplyVLRMS = RMS voltage on BTL loadRL = Load resistanceVP = Peak voltage on BTL loadIDDavg = Average current drawn from the power supplyVDD = Power supply voltageηBTL = Efficiency of a BTL amplifier

and PSUP VDD IDDavg and IDDavg 1

0

VPRL

sin(t) dt 1

VPRL

[cos(t)]

0 2VP RL

Therefore,

PSUP 2 VDD VP

RLsubstituting PL and PSUP into equation 6,

Efficiency of a BTL amplifier

VP2

2 RL2 VDD VP

RL

VP

4 VDD

VP 2 PL RLWhere:

BTL 2 PL RL

4 VDD

Therefore,

(15)

TPA6020A2


(14)

Table 2. Efficiency and Maximum Ambient Temperature vs Output Power

Output Power Efficiency Internal Dissipation Power From Supply Max Ambient Temperature(W) (%) (W) (W) (°C)

5-V, Stereo, 3-Ω Systems

0.5 27.2 2.68 3.68 38

1 38.4 3.20 5.20 17

2 54.4 3.35 7.35 10

2.8 64.4 3.10 8.70 21

5-V, Stereo, 4-Ω BTL Systems

0.5 31.4 2.18 3.18 59

1 44.4 2.50 4.50 46

2 62.8 2.37 6.37 51

2.5 70.2 2.12 7.12 62

5-V, Stereo, 8-Ω Systems

0.25 31.4 1.09 1.59 85 (1)

0.5 44.4 1.25 2.25 85 (1)

1 62.8 1.18 3.18 85 (1)

1.36 73.3 0.99 3.71 85 (1)

(1) Package limited to 85°C ambient

19

www.ti.com

qJA = = = 41.7 C/Wo1 1

Derating Factor 0.2398 (17)

TA Max = T PJ JA DMax - Maxq

= 150 - 41.7(2.53) = 44.5 C/Wo

(18)

PDmax

=

4 VDD

2

p

2

RL (16)

TPA6020A2


Table 2 employs Equation 15 to calculate efficienciesfor four different output power levels. Note that theefficiency of the amplifier is quite low for lower power

Given θJA, the maximum allowable junction tempera-levels and rises sharply as power to the load isture, and the maximum internal dissipation, the maxi-increased resulting in a nearly flat internal powermum ambient temperature can be calculated withdissipation over the normal operating range. Note thatEquation 18. The maximum recommended junctionthe internal dissipation at full output power is lesstemperature for the TPA6020A2 is 150°C.than in the half power range. Calculating the ef-

ficiency for a specific system is the key to properpower supply design. For a 2.8-W audio system with3-Ω loads and a 5-V supply, the maximum draw onthe power supply is almost 8.8 W. Equation 18 shows that the maximum ambient tem-

perature is 44.5°C at maximum power dissipationA final point to remember about Class-AB amplifiers with a 5-V supply.is how to manipulate the terms in the efficiencyequation to the utmost advantage when possible. Table 2 shows that for most applications no airflow isNote that in Equation 15, VDD is in the denominator. required to keep junction temperatures in the speci-This indicates that as VDD goes down, efficiency goes fied range. The TPA6020A2 is designed with thermalup. protection that turns the device off when the junction

temperature surpasses 150°C to prevent damage toA simple formula for calculating the maximum power the IC. In addition, using speakers with an impedancedissipated, PDmax, may be used for a stereo, differen- higher than 4 Ω dramatically increases the thermaltial output application: performance by reducing the output current.

The TPA6020A2 is capable of driving impedances aslow as 3 Ω, but special layout techniques must beconsidered in order to achieve optimal performance.In a 5-V, 3-Ω stereo system, the maximum ambientPDmax for a 5-V, 4-Ω system is 2.53 W.temperature is just 9.1°C . To increase the maximum

The maximum ambient temperature depends on the ambient temperature, θJA has to be reduced. This isheat sinking ability of the PCB system. The derating achieved by increasing the amount of copper on thefactor for the 5 mm x 5 mm QFN package is shown in board. Using 3 oz. or 4 oz. copper, and/or additionalthe dissipation rating table. Converting this to θJA: layers, increases the thermal performance of the

device.

20

PACKAGE OPTION ADDENDUM

www.ti.com 24-Aug-2018

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status(1)

Package Type PackageDrawing

Pins PackageQty

Eco Plan(2)

Lead/Ball Finish(6)

MSL Peak Temp(3)

Op Temp (°C) Device Marking(4/5)

Samples

TPA6020A2RGWR ACTIVE VQFN RGW 20 3000 Green (RoHS& no Sb/Br)

CU NIPDAU Level-2-260C-1 YEAR -40 to 85 TPA6020A2

TPA6020A2RGWT ACTIVE VQFN RGW 20 250 Green (RoHS& no Sb/Br)

CU NIPDAU Level-2-260C-1 YEAR -40 to 85 TPA6020A2

(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.PREVIEW: Device has been announced but is not in production. Samples may or may not be available.OBSOLETE: TI has discontinued the production of the device.

(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substancedo not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI mayreference these types of products as "Pb-Free".RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide basedflame retardants must also meet the <=1000ppm threshold requirement.

(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuationof the previous line and the two combined represent the entire Device Marking for that device.

(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finishvalue exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on informationprovided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken andcontinues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

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PACKAGE OPTION ADDENDUM

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Addendum-Page 2

TAPE AND REEL INFORMATION

*All dimensions are nominal

Device PackageType

PackageDrawing

Pins SPQ ReelDiameter

(mm)

ReelWidth

W1 (mm)

A0(mm)

B0(mm)

K0(mm)

P1(mm)

W(mm)

Pin1Quadrant

TPA6020A2RGWR VQFN RGW 20 3000 330.0 12.4 5.25 5.25 1.1 8.0 12.0 Q2

TPA6020A2RGWR VQFN RGW 20 3000 330.0 12.4 5.3 5.3 1.5 8.0 12.0 Q2

TPA6020A2RGWT VQFN RGW 20 250 330.0 12.4 5.25 5.25 1.1 8.0 12.0 Q2

TPA6020A2RGWT VQFN RGW 20 250 180.0 12.4 5.3 5.3 1.5 8.0 12.0 Q2

PACKAGE MATERIALS INFORMATION

www.ti.com 9-Mar-2018

Pack Materials-Page 1

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

TPA6020A2RGWR VQFN RGW 20 3000 338.0 355.0 50.0

TPA6020A2RGWR VQFN RGW 20 3000 367.0 367.0 35.0

TPA6020A2RGWT VQFN RGW 20 250 338.0 355.0 50.0

TPA6020A2RGWT VQFN RGW 20 250 210.0 185.0 35.0

PACKAGE MATERIALS INFORMATION

www.ti.com 9-Mar-2018

Pack Materials-Page 2

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2.8-wstereo fully differential audio … supply voltage -0.3v to 6 v vi input voltage -0.3v to vdd +...

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