LG FM776F, Руководство по обслуживанию

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KA431/A
2.5 Vref
REFERENCE CATHODE
ANODE
CATHODE (K)
REFERENCE (R)
ANODE (A)
TO-92
8 DIP
8 SOP
1:Ref. 2: Anode 3: Cathode
1: Cathode 6: Anode 8: Ref.
2, 3, 4, 7: N.C
1: Cathode 2, 3, 6, 7: Anode 8: Ref.
4, 5: N.C
1
1
BLOCK DIAGRAM
KA3842B Current-Mode PWM Controller
8
2
7
5
7
6
5
1
3
4
5V
V
REF
SET/
RESET
INTERNAL
BIAS
LOGLC
U.V.L.O.
36V
OSCILLATOR
R
PWM
LATCH
C.S.
COMP
ERR
AMP
S
T
1/3
1/2 V
REF
1V
Vcc
Vcc
V
FB
COMP
CURRENT SENSE
R
T
/C
T
GND
PWR VC
OUTPUT
PWR GND
1
8
BLOCK DIAGRAM