Philips HTS3264-Mk2 Service Manual page 24

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 - AP3843GMTR
7
VCC
UVLO
34V
5
GND
2.50V
VREF
GOOD
LOGIC
4
R /C
OSC
T T
OVER TEMP
PROTECT
ERROR
AMP
2R
+
2
FB
-
1
COMP 1V
R
3
CS
INTERNAL IC DIAGRAM - KA7500C
D
RT
6
OSCILLATOR
5
CT
CK
DEAD
4
TIME
1.2V
CONTROL
PWM
COMP
EA(+) 2
+
1
-
1
EA(-)
16
EA(+)
+
2
-
15
EA(-)
3
COMP INPUT
7 - 1
8
5V
REF
S/R
REP
INTERNAL
BIAS
6
OUTPUT
S Q
Q
R
PWM
LATCH
CURRENT
SENSE
COMPARATOR
OUTPUT CONTROL
13
8
Q
9
11
Q
10
12
5V
BAND GAP
14
PEFERENCE
0.7MA
7
C1
E1
C2
E2
VCC
VREF
GND