STMicroelectronics TDA7850A, TDA7850AH Schematic [ru]

4 x 50 W MOSFET quad bridge power amplifier plus HSD

Features

■ High output power capability:

–4 x 50W/4Ω max.
–4 x 30W/4Ω @ 14.4V, 1KHz, 10%
–4 x 80W/2Ω max.
–4 x 55W/2Ω @ 14.4V, 1KHz, 10%

■ MOSFET output power stage

■ Excellent 2Ω driving capability

■ Hi-fi class distortion

■ Low output noise

■ St-by function

■ Mute function

■ Automute at min. supply voltage detection

■ Low external component count:

– Internally fixed gain (26dB)
– No external compensation
– No bootstrap capacitors

■ On board 0.35A high side driver

Protections:

■ Output short circuit to GND, to V

load

■ Very inductive loads

■ Overrating chip temperature with soft thermal

limiter

■ Output DC offset detection

■ Load dump voltage

■ Fortuitous open gnd

■ Reversed battery

Table 1. Device summary

, across the

s

TDA7850A

Flexiwatt27

(vertical)

Flexiwatt27
(horizontal)

■ ESD

Description

The TDA7850A is a breakthrough MOSFET
technology class AB audio power amplifier in
Flexiwatt27 package designed for high power car
radio. The fully complementary P-Channel/N­Channel output structure allows a rail to rail
output voltage swing which, combined with high
output current and minimized saturation losses
sets new power references in the car-radio field,
with unparalleled distortion performances.

The TDA7850A integrates a DC offset detector.

Order code Package Packing

TDA7850A Flexiwatt27 (vertical) Tube

TDA7850AH Flexiwatt27 (horizontal Tube

October 2007 Rev 1 1/16

www.st.com

1

Contents TDA7850A

Contents

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

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

1.2 Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

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

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

3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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

4.1 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.3 Stand-by and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4.4 DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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

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

6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2/16

TDA7850A List of tables

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3/16

List of figures TDA7850A

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. Standard test and application circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4. Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 5. Output power vs. supply voltage (R
Figure 6. Output power vs. supply voltage (R
Figure 7. Distortion vs. output power (R
Figure 8. Distortion vs. output power (R
Figure 9. Distortion vs. frequency (R
Figure 10. Distortion vs. frequency (R

= 4Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

L

= 2Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

L

Figure 11. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 12. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 13. Output attenuation vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 14. Power dissipation & efficiency vs. output power (R
Figure 15. Power dissipation & efficiency vs. output power (R
Figure 16. Power dissipation vs. output power (R
Figure 17. Power dissipation vs. output power (R

Figure 18. ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 11

Figure 19. Flexiwatt27 (vertical) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . 13

Figure 20. Flexiwatt27 (horizontal) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . 14

= 4Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

L

= 2Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

L

= 4Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

L

= 2Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

L

= 4Ω, SINE) . . . . . . . . . . . . . . . . . . . 11

L

= 2Ω, SINE) . . . . . . . . . . . . . . . . . . . 11

= 4Ω, audio program simulation) . . . . . . . . . . . . . 11

L

= 2Ω, audio program simulation) . . . . . . . . . . . . . 11

L

L

4/16

TDA7850A Block diagram and application circuit

1 Block diagram and application circuit

1.1 Block diagram

Figure 1. Block diagram

IN1

IN2

IN3

IN4

ST-BY

MUTE

0.1μF

0.1μF

0.1μF

0.1μF

AC-GND

0.47μF47μF

Vcc1 Vcc2

OFF DET

HSD/OFF DETHSD

OUT1+

OUT1-

PW-GND

OUT2+

OUT2-

PW-GND

OUT3+

OUT3-

PW-GND

OUT4+

OUT4-

PW-GND

SVR TAB S-GND

D03AU1467

100nF470μF

1.2 Standard test and application circuit

Figure 2. Standard test and application circuit

ST-BY

MUTE

IN1

IN2

IN3

IN4

R1

10K

R2

47K

C1

0.1μF

C2 0.1μF

C3 0.1μF

C4 0.1μF

C9

1μF

C10
1μF

S-GND

C8

0.1μF

5

23

12

13

16

15

14

17 11 26 1, 27

C5

0.47μF

C7

2200μF

Vcc1-2

SVR TAB

C6

47μF

Vcc3-4

721

HSD/OFF DET

10

18

19

20

22

25

24

9

8

6

3

4

2

OUT1

OUT2

OUT3

OUT4

OFF DET

D03AU1469

5/16

Pin description TDA7850A

2 Pin description

Figure 3. Pin connection (top view)

TAB

OFF DET

PW-GND

OUT2-

ST-BY

OUT2+

V

OUT1-

PW-GND

OUT1+

SVR

IN1

IN2

S-GND

IN4

IN3

AC-GND

OUT3+

PW-GND

OUT3-

V

OUT4+

MUTE

OUT4-

PW-GND

HSD

TAB

TAB

OFF DET

PW-GND

OUT2-

ST-BY

OUT2+

V

OUT1-

PW-GND

OUT1+

SVR

IN1

IN2

S-GND

IN4

IN3

AC-GND

OUT3+

PW-GND

OUT3-

V

OUT4+

MUTE

OUT4-

PW-GND

HSD

TAB

1

CC

Vertical

CC

27

D03AU1468

1

CC

Horizontal

CC

27

AC00107

6/16