TDA7451 Datasheet, PDF (1/9 Pages) STMicroelectronics – 4x7W OR 2x22W CAR RADIO POWER AMPLIFIER PLUS TRIPLE POWER SUPPLY

®
TDA7451
4x7W OR 2x22W CAR RADIO POWER AMPLIFIER PLUS
TRIPLE POWER SUPPLY
HIGH OUTPUT POWER CAPABILITY:
4 x 9.5W OR 2 x 32W/4Ω MAX
4 x 8.5W OR 2 x 28W/4Ω EIAJ
4 x 7W OR 2 x 22W/4Ω @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-
PRELIMINARY DATA
Flexiwatt25
ORDERING NUMBER: TDA7451
TURE
PROTECTIONS
General:
LOAD DUMP
OVERRATING CHIP TEMPERATURE
Audio Section:
OUT SHORT (TO GND, TO Vs
ACROSS THE LOAD)
AND
Power Supply Section:
SHORT CIRCUIT PROTECTION (OUT TO
GND)
BLOCK DIAGRAM
MUTE
ST-BY
10KΩ
10µF
10KΩ
1µF
8.5V
10µF
5V
10µF
5V
22K
10µF
RESET
DIAG
IN RR IN RF
V_O3
V_O2
V_O1
22K
SVR
47µF
22
8
2
200mA
REG.
3
500mA
REG.
4
150mA
REG.
9
7
DIAG
10
5
STCAP
470µF
0.1µF
0.1µF
V_CC1
V_CC2
12 11
6
20
23
+
0.1µF
V_CC
1000µF
+
-
RF
21
-
+
-
hvcc
RR
25 HVCC
LF
17
+
+
-
15 14
TAB
1
LR
19
-
-
+
PW-GND
18,24
16 13
0.1µF
DDL S-GND
0.1µF
IN LF IN LR
D95AU311C
October 1999
1/9
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.