6
LT1425
BLOCK DIAGRA
M
W
FLYBACK ERROR A PLIFIER DIAGRA
W
W
+
–
D1
T1
•
•
ISOLATED
V
OUT
C1
+
V
IN
V
SW
V
C
C
EXT
R
FB
R
FB
R
REF
R
REF
V
BG
Q4
D2
Q1
Q2 Q3
V
IN
I
I
M
I
M
I
FXD
ENABLE
1425 EA
–
+
LOAD
COMPENSATION
CURRENT
AMPLIFIER
DRIVER
LOGIC
285kHz
OSCILLATOR
2.6V
REGULATOR
SHDN
FLYBACK
ERROR
AMPLIFIER
COMP
R
CCOMP
R
OC0MP
R
REF
V
SW
R
SENSE
PGND
1425 BD
V
C
SGND
GND IS OMITTED FOR CLARITY
V
IN
R
FB
SYNC
