Publicité
1
2
TL431
CATHODE
800
800
REF
3.28 k
4 k
20 pF
2.4 k
7.2 k
1 k
800
ANODE
1
2
3
4
TOP249
CONTROL(C)
20 pF
150
10 k
EXTERMINAL
CURRENT LIMIT(X)
LINE-SENSE(L)
FREQUENCY(F)
3
4
5
Vc
Zc
SHUNT REGULATOR/
ERROR AMPLIFIER
SOFT START
5.8V
4.8V
5.8V
INTERNAL UV
FB
COMPARATOR
V1(LIMIT)
CURRENT
LIMIT
SOFT
ADJUST
START
ON/OFF
VBG + VT
1V
STOP
LOGIC
VBG
STOP SOFT
OV/UV
START
DMAX
LINE
DC
DC
SENSE
MAX
MAX
CLOCK
HALF
SAW
FREQ.
OSCILLATOR
WITH JITTER
LIGHT LOAD
FREQUENCY
REDUCTION
RE
5
6
7
0
INTERNAL
SUPPLY
1
+8
SHUTDOWN/
CURRENT LIMIT
AUTO-RESTART
COMPARATOR
HYSTERETIC
THERMAL
SHUTDOWN
CONTROLLED
TURN-ON
GATE DRIVER
S
Q
R
BALANKING
PWM
COMPARATOR
6
7
8
DRAIN(D)
E
D
C
LEADING
EDGE
B
SOURCE(S)
A
13
8
Publicité
