lt3837 Linear Technology Corporation, lt3837 Datasheet - Page 8

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

BLOCK DIAGRAM
LT3837
8
10
15
2
7
5
3
4
V
UVLO
OSC
SYNC
t
PGDLY
ENDLY
ON
CC
0.8V
OSCILLATOR
+
–
REFERENCE
1.25V
(V
FB
DISABLE
)
–
+
SET
TSD
UVLO
+
–
REGULATOR
INTERNAL
BLOCK
LOGIC
CURRENT TRIP
SLOPE COMPENSATION
ENABLE
PGATE
SGATE
3V
0.7
1.3
CLAMPS
1.25V
S
R
COMPARATOR
–
+
CURRENT
Q
Q
COLLAPSE DETECT
TO FB
ERROR AMP
+
–
–
+
+
–
1V
GATE DRIVE
GATE DRIVE
+
R
50k
CMPF
3V
–
OVERCURRENT
FAULT
V
V
CC
CC
+
–
–
CURRENT
SENSE AMP
LOAD
COMPENSATION
+
SENSE
SENSE
R
C
SFST
GND
CMP
CMP
PG
SG
FB
V
3837 BD
C
–
+
11
12
13
14
16
17
8
9
6
1
3837fa