Philips HTS5540 Service Manual page 25

7 - 1
POWER BOARD
TABLE OF CONTENTS
Internal IC Diagram ........................................................................... 7-1
Circuit Diagram .................................................................................. 7-2
PCB Layout Top View ....................................................................... 7-3
PCB Layout Bottom View .................................................................. 7-4
INTERNAL IC DIAGRAM - AZ431
CATHODE
REF +
-
REF
V
ANODE
INTERNAL IC DIAGRAM - AZ7500BP
6
RT
5 Oscillator
CT
Dead-Time Control
Comparator
4
DTC +
0.12V
Error Amplifier 1 +
PWM
1
Comparator
+
1IN +
2
1IN -
Error Amplifier 2
16
2IN + +
15
2IN -
0.7mA
3
FEEDBACK
7 - 1
OUTPUT CTRL
13 8
Pulse-Steering
Flip-Flop
Q1
9
D
11
CK
Q2
10
12
Reference 14
Regulator
7
C1
E1
C2
E2
V
CC
REF
GND