July 2010 Doc ID 17715 Rev 1 1/15

1

TDA7851A

4 x 45 W MOSFET quad bridge power amplifier

Features■ Multipower BCD technology

■ High output power capability:– 4 x 45 W/4 Ω Max.– 4 x 28 W/4 Ω @ 14.4 V, 1 kHz, 10 %– 4 x 72 W/2 Ω Max.

■ MOSFET output power stage

■ Excellent 2 Ω driving capability

■ Hi-Fi class distortion

■ Low output noise

■ Standby function

■ Mute function

■ Automute at min. supply voltage detection

■ Low external component count:– Internally fixed gain (26 dB)– No external compensation– No bootstrap capacitors

Protections

■ Output short circuit to Gnd, to Vs, across the load

■ Very inductive loads

■ Overrating chip temperature with soft thermal limiter

■ Output DC offset detection

■ Load dump voltage

■ Fortuitous open GND

■ Reversed battery

■ ESD

DescriptionThe TDA7851A is a breakthrough MOSFET technology class AB audio power amplifier, designed for high-power car radio.

The fully complementary P-Channel/N-Channel output structure allows a rail-to-rail output voltage swing. This, combined with high output current and minimized saturation losses, sets new power references in the car-radio field, with unparalleled distortion performance.

Flexiwatt 27

Table 1. Device summary

Order code Package Packing

TDA7851A Flexiwatt 27 Tube

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Contents TDA7851A

2/15 Doc ID 17715 Rev 1

Contents

1 Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.1 DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.3 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.4 Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.5 Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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TDA7851A List of tables

Doc ID 17715 Rev 1 3/15

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Table 2. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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List of figures TDA7851A

4/15 Doc ID 17715 Rev 1

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Figure 2. Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Figure 3. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 4. Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 5. Output power vs. supply voltage (RL = 4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 6. Output power vs. supply voltage (RL = 2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 7. Distortion vs. output power (RL = 4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 8. Distortion vs. output power (RL = 2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 9. Distortion vs. frequency (RL = 4 Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 10. Distortion vs. frequency (RL = 2 Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure 11. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure 12. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure 13. Output attenuation vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure 14. Power dissipation and efficiency vs. output power (RL = 4 Ω, SINE) . . . . . . . . . . . . . . . . . 10Figure 15. Power dissipation and efficiency vs. output power (RL = 2 Ω, SINE) . . . . . . . . . . . . . . . . . 10Figure 16. Power dissipation vs. output power (RL = 4 Ω, audio program simulation) . . . . . . . . . . . . 11Figure 17. Power dissipation vs. output power (RL = 2 Ω, audio program simulation) . . . . . . . . . . . . 11Figure 18. ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 11Figure 19. Flexiwatt27 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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TDA7851A Block diagram and application circuit

Doc ID 17715 Rev 1 5/15

1 Block diagram and application circuit

1.1 Block diagram

Figure 1. Block diagram

1.2 Application circuit

Figure 2. Application circuit

IN1

MUTE

ST-BY

IN2

OUT1+

OUT1-

OUT2+

OUT2-

PW-GND

IN3

IN4

OUT3+

OUT3-

OUT4+

OUT4-

PW-GND

PW-GND

PW-GND

D05AU1613

AC-GND SVR TAB S-GND

Vcc1 Vcc2

CD

OFFSETDETECTOR

IN1

0.1μF

C91μF

IN2

C2 0.1μF

OUT1

OUT2

IN3

C3 0.1μF

IN4

C4 0.1μF

OUT3

OUT4

D05AU1614C5

0.47μFC6

47μF

SVR TAB

Vcc1-2 Vcc3-4

C80.1μF

C72200μF

C101μF

ST-BYR1

10K

R2

47KMUTE

C1

15

16

13

12

23

5

14S-GND

17 11 26 27

CD OUT

7 21

10

9

8

6

3

4

18

19

20

22

25

24

2

OFFSET DETECTOR OUT

47K

R4V

47K

R3V

CD

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Pin description TDA7851A

6/15 Doc ID 17715 Rev 1

2 Pin description

2.1 Pin connection

Figure 3. Pin connection (top view)

2.2 Thermal data

D03AU1468A

OF

F D

ET

TA

B

PW

-GN

D

OU

T2-

ST

-BY

OU

T2+

VC

C

OU

T1-

PW

-GN

D

OU

T1+

SV

R

IN1

IN2

S-G

ND

IN4

IN3

AC

-GN

D

OU

T3+

PW

-GN

D

OU

T3-

VC

C

OU

T4+

MU

TE

OU

T4-

PW

-GN

D

CD

TA

B

1 27

Table 2. Thermal data

Symbol Parameter Value Unit

Rth j-case Thermal resistance junction-to-case Max 1 °C/W

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TDA7851A Electrical specifications

Doc ID 17715 Rev 1 7/15

3 Electrical specifications

3.1 Absolute maximum ratings

3.2 Electrical characteristicsRefer to the test and application diagram, VS = 14.4 V; RL = 4 Ω; Rg = 600 Ω; f = 1 kHz; Tamb = 25 °C; unless otherwise specified.

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

VS Operating supply voltage 18 V

VS (DC) DC supply voltage 28 V

VS (pk) Peak supply voltage (for t = 50 ms) 50 V

IO

Output peak currentNon repetitive (t = 100 µs)Repetitive (duty cycle 10 % at f = 10 Hz)

10

9

A

A

Ptot Power dissipation Tcase = 70 °C 85 W

Tj Junction temperature 150 °C

Tstg Storage temperature -55 to 150 °C

Table 4. Electrical characteristics

Symbol Parameter Test condition Min. Typ. Max. Unit

VS Supply voltage range - 8 - 18 V

Iq1 Quiescent current RL = ∞ 100 150 300 mA

VOS Output offset voltage Play mode / Mute mode -60 - +60 mV

dVOS

During mute ON/OFF output offset voltage ITU R-ARM weighted

see Figure 18

-10 - +10 mV

During standby ON/OFF output offset voltage

-10 - +10 mV

Gv Voltage gain - 25 26 27 dB

dGv Channel gain unbalance - - - ±1 dB

Po Output power

VS = 14.4 V; THD = 10 %VS = 14.4 V; THD = 1 %

25 2822

-WW

VS = 14.4 V; THD = 10 %, 2 ΩVS = 14.4 V; THD = 1 %, 2 Ω

-4838

-WW

Po max. Max. output power(1) VS = 14.4 V; RL = 4 ΩVS = 14.4 V; RL = 2 Ω

-4575

-WW

THD Distortion Po = 4 W - 0.01 0.05 %

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Electrical specifications TDA7851A

8/15 Doc ID 17715 Rev 1

eNo Output noise"A" Weighted

Bw = 20 Hz to 20 kHz-

35

50 100

µV

µV

SVR Supply voltage rejection f = 100 Hz; Vr = 1 Vrms 50 70 - dB

fch High cut-off frequency PO = 0.5 W 100 300 - kHz

Ri Input impedance - 70 100 130 kΩ

CT Cross talkf = 1 kHz, PO = 4 W

f = 10 kHz, PO = 4 W

60 70

60

-

-

dB

dB

ISB Standby current consumptionVSt-by = 1.2 V - - 20 µA

VSt-by = 0 - - 10 µA

Ipin5 Standby pin current VSt-by = 1.2 V to 2.6 V - - ±1 µA

VSB out Standby out threshold voltage (Amp: ON) 2.6 - - V

VSB in Standby in threshold voltage (Amp: OFF) - - 1.2 V

AM Mute attenuation POref = 4 W 80 90 - dB

VM out Mute out threshold voltage (Amp: Play) 2.6 - - V

VM in Mute in threshold voltage (Amp: Mute) - - 1.2 V

VAM in VS automute threshold

(Amp: Mute)

Att ≥ 80 dB; POref = 4 W

(Amp: Play)

Att < 0.1 dB; PO = 0.5 W

6.7

-

7

7.5 8

V

V

Ipin23 Muting pin current

VMUTE = 1.2 V

(Sourced current)7 12 18 µA

VMUTE = 2.6 V -5 - 18 µA

Offset detector

VOFF Detected differential output offset VSt-by = 5 V ±1 ±2 ±3 V

VOFF_SAT Off detector saturation voltageVo > ±3 V, Ioff Det = 1 mA0 V < Voff Det < 18 V

- 0.2 0.4 V

VOFF_LK Off detector leakage current Vo < ±1 V - 0 15 µA

Clipping detector

CDLK Clip detector high leakage current Cd off - 0 1 µA

CDSAT Clip detector saturation voltage DC On; ICD = 1 mA - 0.2 0.4 V

CDTHD Clip detector THD level - - 2 - %

1. Saturated square wave output

Table 4. Electrical characteristics (continued)

Symbol Parameter Test condition Min. Typ. Max. Unit

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TDA7851A Electrical specifications

Doc ID 17715 Rev 1 9/15

3.3 Electrical characteristics curves

Figure 4. Quiescent current vs. supply voltage

Figure 5. Output power vs. supply voltage(RL = 4 Ω)

Figure 6. Output power vs. supply voltage(RL = 2 Ω)

Figure 7. Distortion vs. output power(RL = 4 Ω)

Figure 8. Distortion vs. output power(RL = 2 Ω)

Figure 9. Distortion vs. frequency(RL = 4 Ω)

AC00024

120

130

140

150

160

170

180

8 10 12 14 16 18

Id (mA)

Vs (V)

Vi = 0RL = ∞

5101520253035404550556065707580

8 9 10 11 12 13 14 15 16 17 18

Po (W)

Vs (V) AC00025

RL= 4Ωf =1 KHz

Po-max

THD=10%

THD=1%

0

10

20

30

40

50

60

70

80

90

100

110

120

130

8 9 10 11 12 13 14 15 16 17 18

Vs (V)

Po (W)

Po-max

THD=10%

THD=1%

RL=2Ωf=1 KHz

AC00026

0.001

0.01

0.1

1

10

0.1 1 10 100Po (W)

THD (%)

Vs = 14.4 VRL = 4Ω

f = 1 KHz

f = 10 KHz

AC00027

0.001

0.01

0.1

1

10

0.1 1 10 100

Po (W)

THD (%)

Vs = 14.4 VRL = 2 Ω

f = 10 KHz

f = 1 KHz

AC00028

0.001

0.01

0.1

1

10

10 100 1000 10000 100000

f (Hz)

THD (%)

Vs = 14.4 VRL = 4 ΩPo = 4 W

AC00029

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Electrical specifications TDA7851A

10/15 Doc ID 17715 Rev 1

Figure 10. Distortion vs. frequency(RL = 2 Ω)

Figure 11. Crosstalk vs. frequency

Figure 12. Supply voltage rejection vs. frequency

Figure 13. Output attenuation vs. supply voltage

Figure 14. Power dissipation and efficiency vs. output power (RL = 4 Ω, SINE)

Figure 15. Power dissipation and efficiency vs. output power (RL = 2 Ω, SINE)

0.001

0.01

0.1

1

10

10 100 1000 10000 100000

f (Hz)

THD (%)

Vs = 14.4 VRL = 2Ω Po = 8 W

AC00030

-100

-90

-80

-70

-60

-50

-40

-30

-20

10 100 1000 10000 100000

RL = 4 ΩPo = 4WRg = 600 Ω

f (Hz)

CROSSTALK (dB)

AC00031

-100

-90

-80

-70

-60

-50

-40

-30

-20

10 100 1000 10000 100000

f (Hz)

SVR (dB)

Rg = 600 ΩVripple = 1Vrms

AC00032

-100

-80

-60

-40

-20

0

5 6 7 8 9 10

Vs (V)

OUTPUT ATTN (dB)

RL = 4 ΩPo = 4 W ref

AC00033

0

10

20

30

40

50

60

70

80

90

0 2 4 6 8 10 12 14 16 18 20 22 24 26 280

10

20

30

40

50

60

70

80

90Ptot (W) η (%)

η

Ptot

Vs = 14.4 VRL = 4 x 4Ω f = 1 KHz SINE

Po (W) AC00034

0

20

40

60

80

100

120

140

160

180

0 5 10 15 20 25 30 35 40 45 500

10

20

30

40

50

60

70

80

90Ptot (W) η (%)

η

Ptot

Vs = 14.4 VRL = 4 x 2Ω f = 1 KHz SINE

Po (W) AC00035

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TDA7851A Electrical specifications

Doc ID 17715 Rev 1 11/15

Figure 16. Power dissipation vs. output power (RL = 4 Ω, audio program simulation)

Figure 17. Power dissipation vs. output power (RL = 2 Ω, audio program simulation)

Figure 18. ITU R-ARM frequency response, weighting filter for transient pop

5

10

15

20

25

30

0 1 2 3 4 5 6

Vs = 14.4 VRL = 4 x 4 ΩGAUSSIAN NOISE

CLIP START

Ptot (W)

Po (W) AC00036

5

10

15

20

25

30

35

40

45

50

55

60

0 2 4 6 8 10

Vs = 14.4 VRL = 4 x 2 ΩGAUSSIAN NOISE

CLIP START

Ptot (W)

Po (W) AC00037

Output attenuation (dB)

-50

-40

-30

-20

-10

0

10

10 100 1000 10000 100000

Hz AC00343

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Application hints TDA7851A

12/15 Doc ID 17715 Rev 1

4 Application hints

4.1 DC offset detectorThe TDA7851A integrates a DC offset detector to avoid that an anomalous DC offset on the inputs of the amplifier may be multiplied by the gain and result in a dangerous large offset on the outputs which may lead to speakers damage for overheating.The feature works with the amplifier unmuted and no signal at the inputs.

4.2 SVRBesides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF time sequence and, consequently, plays an essential role in the pop optimization during ON/OFF transients. To conveniently serve both needs, its minimum recommended value is 10 µF.

4.3 Input stageThe TDA7851A's inputs are ground-compatible and can stand very high input signals (± 8 Vpk) without any performance degradation.If the standard value for the input capacitors (0.1µF) is adopted, the low frequency cut-off amounts to 16 Hz.

The input capacitors should be 1/4 of the capacitor connected to AC-GND pin for optimum pop performance.

4.4 Standby and mutingStandby and muting facilities are both CMOS-compatible. In absence of true CMOS ports or microprocessors, a direct connection to Vs of these two pins is admissible but a 470 kΩ equivalent resistance should present between the power supply and the muting and stand-by pins.R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noises.About the standby, the time constant to be assigned in order to obtain a virtually pop-free transition has to be slower than 2.5 V/ms.

4.5 Heatsink definitionUnder normal usage (4 Ω speakers) the heatsink's thermal requirements have to be deduced from Figure 16, which reports the simulated power dissipation when real music/speech programmes are played out. Noise with gaussian-distributed amplitude was employed for this simulation. Based on that, frequent clipping occurrence (worst-case) causes Pdiss = 26 W. Assuming Tamb = 70° C and TCHIP = 150 °C as boundary conditions, the heatsink's thermal resistance should be approximately 2 °C/W. This would avoid any thermal shutdown occurrence even after long-term and full-volume operation.

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TDA7851A Package information

Doc ID 17715 Rev 1 13/15

5 Package information

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®

specifications, grade definitions and product status are available at: www.st.com.

ECOPACK® is an ST trademark.

Figure 19. Flexiwatt27 mechanical data and package dimensions

OUTLINE ANDMECHANICAL DATA

DIM. mm inchMIN. TYP. MAX. MIN. TYP. MAX.

A 4.45 4.50 4.65 0.175 0.177 0.183B 1.80 1.90 2.00 0.070 0.074 0.079C 1.40 0.055D 0.75 0.90 1.05 0.029 0.035 0.041E 0.37 0.39 0.42 0.014 0.015 0.016

F (1) 0.57 0.022G 0.80 1.00 1.20 0.031 0.040 0.047G1 25.75 26.00 26.25 1.014 1.023 1.033

H (2) 28.90 29.23 29.30 1.139 1.150 1.153H1 17.00 0.669H2 12.80 0.503H3 0.80 0.031

L (2) 22.07 22.47 22.87 0.869 0.884 0.904L1 18.57 18.97 19.37 0.731 0.747 0.762

L2 (2) 15.50 15.70 15.90 0.610 0.618 0.626L3 7.70 7.85 7.95 0.303 0.309 0.313L4 5 0.197L5 3.5 0.138M 3.70 4.00 4.30 0.145 0.157 0.169M1 3.60 4.00 4.40 0.142 0.157 0.173N 2.20 0.086O 2 0.079R 1.70 0.067R1 0.5 0.02R2 0.3 0.12R3 1.25 0.049R4 0.50 0.019V 5˚ (Typ.)V1 3˚ (Typ.)V2 20˚ (Typ.)V3 45˚ (Typ.)

(1): dam-bar protusion not included(2): molding protusion included

Flexiwatt27 (vertical)

H3

R4

G

V

V

G1

L2

H1H

FM1

L

FLEX27ME

V3

OL3

L4

H2

R3

N

V2

R

R2

R2

C

B

L1

M

R1

L5 R1 R1

E

D

A

V1

V1

7139011

Pin 1

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Revision history TDA7851A

14/15 Doc ID 17715 Rev 1

6 Revision history

Table 5. Document revision history

Date Revision Changes

09-Jul-2010 1 Initial release.

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TDA7851A

Doc ID 17715 Rev 1 15/15

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