POWER BOARD
TABLE OF CONTENTS
Internal IC Diagram........................................................7-1
Circuit Diagram ................................................................ 7-2
PCB Layout.......................................................................7-3
Electrical Parts List..........................................................7-4
7
-1
ANODE
REF
CATHODE
2.4 k
7.2 k
3.28 k
20 pF
4 k
1 k
800
800
800
20 pF
150
10 k
TL431 EQUIVALENT SCHEMATIC
TOP249 BLOCK DIAGRAM
7
-1
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
DMAX
STOP
SOFT-
START
-
+
CONTROL (C)
LINE-SENSE (L)
EXTERNAL
CURRENT LIMIT (X)
FREQUENCY (F)
-
+
5.8 V
1 V
IFB
RE
ZC
VC
+
-
LEADING
EDGE
BLANKING
÷
8
1
HYSTERETIC
THERMAL
SHUTDOWN
SHUNT REGULATOR/
ERROR AMPLIFIER
+
-
DRAIN (D)
ON/OFF
SOFT
START
DC
MAX
VBG
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
Содержание LX700/21S/22S/25S
Страница 13: ...2 1 2 1 REPAIR INSTRUCTION ...
Страница 14: ...2 2 2 2 REPAIR INSTRUCTION ...
Страница 16: ...3 2 SERVICE POSITIONS Service position A Service position B 3 2 ...
Страница 17: ...4 1 BLOCK DIAGRAM 4 1 ...
Страница 18: ...WIRING DIAGRAM 4 2 4 2 ...
Страница 40: ...8 10 8 10 PCB LAYOUT COMPONENT VIEW 1 A B C D A B C D 2 3 4 1 2 3 4 ...
Страница 43: ...8 13 8 13 PCB LAYOUT COPPERSIDE VIEW 1 2 3 4 5 6 1 2 3 4 5 6 A B C D A B C D ...
Страница 45: ...9 1 9 1 EXPLODED DRAWING LX700 22S 25S ONLY LX700 33S 35S ONLY LX700 21S 39S ONLY ...