lt3837 Linear Technology Corporation, lt3837 Datasheet - Page 9

• Manufacturer Part Number: lt3837
• Description: Isolated No-opto Synchronous Flyback Controller
• Manufacturer: Linear Technology Corporation

FLYBACK FEEDBACK AMPLIFIER
TIMING DIAGRAM
R1
R2
8
FB
–
MOSFET DRAIN
PRIMARY SIDE
PG VOLTAGE
SG VOLTAGE
1V
+
VOLTAGE
ENABLE
COLLAPSE
DETECT
LT3837 FEEDBACK AMP
1.25V
V
FB
–
+
R
S
t
ON
Q
V
IN
V
FLBK
V
CC
ENABLE
DELAY
9
3837 FFA
V
IN
C
AMPLIFIER
FEEDBACK
VC
MIN ENABLE
ENABLED
V
FLBK
MP
PRIMARY
FLYBACK
V
IN
•
•
T1
PG DELAY
•
0.8 • V
SECONDARY
FLBK
MS
3825 TD
C
OUT
ISOLATED
OUTPUT
LT3837
3837fa
9