Philips FWD570/21M - POWER BOARD - IC BLOCK DIAGRAMS; SMPS Controller and Power Switch ICs

POWER BOARD
TABLE OF CONTENTS
IC Internal Block Diagram ................................................... 8-1
Circuit Diagram .................................................................... 8-2
PCB Layout .......................................................................... 8-3
Electrical Parts List .............................................................. 8-4
8-1
8-1
IC INTERNAL BLOCK DIAGRAM
SMPS CONTROLLER - KA7500C
OSCILLATOR
+
1
-
+
2
3
-
7
14
12
10
11
9
8
C1
E1
C2
E2
V
CC
R
T
C
T
V
REF
GND
13
1
6
5
4
2
16
15
BAND GAP
REFERENCE
OUTPUT CONTROL
DEAD
TIME
CONTROL
EA(+)
EA(-)
EA(+)
EA(-)
PWM
COMP
COMP INPUT
0.7MA
1.2V
D
Q
Q
CK
5V
uA
V
CC
32V
5
A
5V
2.5R
1R
1mA
0.1V
+
OVER VOLTAGE S/D
+
7.5V
27V
Thermal S/D
S
R
Q
Power on reset
+
L.E.B
S
R
Q
OSC
5V
Vref
Internal
bias
Good
logic
SFET
DRAIN
GND
FB
Soft Start
9V
*
IC INTERNAL BLOCK DIAGRAM
FAIRCHILD POWER SWITCH - KA5M02659RN