TDA7451

4x7W OR 2x22W CAR RADIO POWER AMPLIFIER PLUS

TRIPLE POWER SUPPLY

PRELIMINARY DATA

HIGH OUTPUT POWER CAPABILITY:

4 x 9.5W OR 2 x 32W/4

Ω MAX

4 x 8.5W OR 2 x 28W/4

Ω EIAJ

4 x 7W OR 2 x 22W/4

Ω @14.4V,1KHz; 10%

MINIMIZED EXTERNAL COUNT

- NO NEED OF DECOUPLING CAPACITORS

- NO NEED OF BOOTSTRAP CAPACITOR

- NO NEED OF EXTERNAL COMPENSATION

- INTERNALLY FIXED GAIN (20dB)

POP-FREE AUDIO SECTION

ST-BY FUNCTION (C-MOS)

MUTE FUNCTION (C-MOS)

CLIP DETECTOR,

THERMAL

WARNING,

SHORT CIRCUIT DETECTION

BUILT-IN VOLTAGE REGULATORS:

- 5V @ 150mA WITH RESET

- 5V @ 500mA WITH ST-BY

- 8.5V @ 200mA WITH ST-BY

REGULATORS DIAGNOSTIC FEATURE: UN-

DERVOLTAGE, 8.5V DROP SENSE, SHORT

CIRCUIT, LOAD DUMP, OVER-TEMPERA-

TURE

PROTECTIONS

General:

LOAD DUMP

OVERRATING CHIP TEMPERATURE

Audio Section:

OUT SHORT (TO GND, TO Vs

AND

ACROSS THE LOAD)

Power Supply Section:

SHORT CIRCUIT PROTECTION (OUT TO

GND)

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

October 1999

®

IN RF

D95AU311C

+

-

+

RESET

10

µF

+

-

+

PW-GND

1000

µF

0.1

µF

200mA

REG.

-

-+

RF

RR

-

-+

LF

LR

HVCC

hvcc

ST-BY

1

µF

MUTE

10K

Ω

IN RR

0.1

µF

0.1

µF

500mA

REG.

8.5V

IN LR

IN LF

0.1

µF

0.1

µF

5V

150mA

REG.

10

µF

5V

DIAG

470

µF

STCAP

SVR

DDL

S-GND

10

µF

12

22

8

2

3

4

9

7

10

5

15

14

16

13

18,24

19

17

25

21

23

11

620

1

TAB

47µF

22K

22K

DIAG

10

µF

10K

Ω

BLOCK DIAGRAM

Flexiwatt25

ORDERING NUMBER: TDA7451

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