Philips HTS4600/05 Service Manual page 30

8 - 1
AMP BOARD
TABLE OF CONTENTS
Internal IC Diagram ........................................................................... 8-1
Circuit Diagram .................................................................................. 8-2
PCB Layout Top view ....................................................................... 8-3
PCB Layout Bottom View .................................................................. 8-4
INTERNAL IC DIAGRAM - TDA8920B
V DDA2
V DDA1
3 (20) 10 (4) 18 (12)
9 (3)
IN 1M
INPUT PWM
8 (2)
STAGE MODULATOR
IN 1P
MUTE
11 (5)
SGND 1
STAB1
7 (1)
OSC
OSCILLATOR
MANAGER
6 (23)
MODE
MODE
2 (19)
SGND 2
MUTE
5 (22)
IN 2 P
INPUT
PWM
4 (21)
STAGE
IN2M MODULATOR
1 (18)
12 (6)
V SSA2 V SSA1
INTERNAL IC DIAGRAM - CO4558A
8 - 1
V DDP 1
V DDP 2
STAB 1 PROT
13 (7) 23 (16)
RELEASE 1
DRIVER
CONTROL
SWITCH 1
HIGH
AND
ENABLE 1
HANDSHAKE
DRIVER
LOW
V SSP 1
TDA8920BTH
TEMPERATURE SENSOR
(TDA8920BJ)
V DDP 2
CURRENT PROTECTION
VOLTAGE PROTECTIONS
22 (15)
ENABLE 2
DRIVER
HIGH
CONTROL
21 (14)
SWITCH 2
AND
HANDSHAKE
RELEASE 2 DRIVER
LOW
24 (17)
19 (-)
17 (11) 20 (13)
V SSD V SSP1
V SSP2
N.C.
14 (8)
15 (9)
BOOT 1
16 (10)
OUT 1
BOOT 2
OUT 2