Tda8920 Internal Ic Diagram; Main Board - Philips FWD796 Service Manual

7-1

MAIN BOARD

TABLE OF CONTENTS
Internal IC Diagram ......................................................... 7-1
Block Diagram ................................................................. 7-2
Circuit Diagram - Servo Part ........................................... 7-3
Circuit Diagram - Main Part ............................................. 7-4
Layout Mapping - Main Part ............................................ 7-5
Circuit Diagram - Tape Part ............................................. 7-6
PCB Layout Top View ...................................................... 7-7
Layout Mapping - Main Part ............................................ 7-8
PCB Layout Bottom View ................................................ 7-9
Electrical Parts list ......................................................... 7-10

TDA8920 INTERNAL IC DIAGRAM

V DDA2 V DDA1
3 10
9
IN1−
INPUT PWM
8 STAGE MODULATOR
IN1+
mute
11
SGND1
STABI
7
OSC
OSCILLATOR MANAGER
6
MODE MODE
2
SGND2
mute
5
IN2+
INPUT PWM
4
STAGE MODULATOR
IN2−
1 12
V SSA2 V SSA1
7-1
V DDP2 V DDP1
STABI PROT
18 13 23
RELEASE1
DRIVER
HIGH
SWITCH1
CONTROL
AND
ENABLE1
HANDSHAKE
DRIVER
LOW
V SSP1
TEMPERATURE SENSOR
TDA8920TH
V DDP2
CURRENT PROTECTION
DRIVER
ENABLE2
HIGH
CONTROL
SWITCH2
AND
HANDSHAKE
DRIVER
RELEASE2
LOW
24 19 17
V SSD V SSP1 V SSP2
HW
14
15
BOOT1
16
OUT1
22
BOOT2
21
OUT2
20
MBL461