POWER BOARD
TABLE OF CONTENTS
Internal IC Diagram & Voltages List .................................. 10-1
Circuit Diagram .................................................................. 10-2
PCB Layout ........................................................................ 10-3
Electrical Parts List ............................................................ 10-4
10-1
10-1
TOP249 INTERNAL IC DIAGRAM
SHUTDOWN/
AUTO-RESTART
PWM
COMPARATOR
CLOCK
SAW
HALF
FREQ.
CONTROLLED
TURN-ON
GATE DRIVER
CURRENT LIMIT
COMPARATOR
INTERNAL UV
COMPARATOR
INTERNAL
SUPPLY
5.8 V
4.8 V
SOURCE (S)
S
R
Q
D MAX
STOP
SOFT-
START
-
+
CONTROL (C)
LINE-SENSE (L)
EXTERNAL
CURRENT LIMIT (X)
FREQUENCY (F)
-
+
5.8 V
1 V
IFB
R E
ZC
V C
+
-
LEADING
EDGE
BLANKING
÷
8
1
HYSTERETIC
THERMAL
SHUTDOWN
SHUNT REGULATOR/
ERROR AMPLIFIER
+
-
DRAIN (D)
ON/OFF
SOFT
START
DC
MAX
V BG
DC
MAX
V BG + V T
0
OV/UV
VI (LIMIT)
CURRENT
LIMIT
ADJUST
LINE
SENSE
SOFT START
LIGHT LOAD
FREQUENCY
REDUCTION
STOP LOGIC
OSCILLATOR WITH JITTER
VOLTAGE
PIN
1
2
3
PIN
1
2
3
PIN
1
2
3
VOLTAGE -3.8 -28.2
-12.3
VOLTAGE 5.1
5.7 19.8
VOLTAGE 7.2 27.7
7
PIN
1
2
3
PIN
1
2
3
PIN
1
2
3
VOLTAGE 7.2 27.7
7
VOLTAGE 25.4 27.8 27.2
VOLTAGE-0.67-0.67 0
PIN
1
2
3
PIN
1
2
3
PIN
1
2
3
VOLTAGE 0.06 42 0.05
VOLTAGE-32.2-41.9
-32.6
VOLTAGE 43 -26.8
42.2
PIN
1
2
3
PIN
1
2
3
PIN
1
2
3
VOLTAGE 0.06 0.2 0.74
VOLTAGE
12.15 12.15 13.35
VOLTAGE
0 13.25 0
Q9004 (2SC2001)
Q9005 (2SA733)
Q9006 (2SC945)
Q905 (2SA733)
Q905 (2SA733)
Q906 (2SC945)
Q9001 (2SC945)
Q9002 (2SA733)
Q9003 (2SA733)
Q901 (TIP127)
Q903 (2N2222A)
Q904 (TLP122)
PIN
1
2
3
4
5
6
VOLTAGE
0
40 -1.5 -1.5
0
83
PIN
1
2
3
VOLTAGE 2.4
0
5
PIN
1
2
3
VOLTAGE 12
0
7.9
PIN
1
2
3
VOLTAGE 6.9
0
5
PIN
1
2
3
VOLTAGE 6.9
0
5
IC9003 (BA05T)
IC901 (TOP249)
IC903 (TL431)
IC9001 (L7808)
IC9002 (BA05T)
