ltc4268cdkd-1-trpbf Linear Technology Corporation, ltc4268cdkd-1-trpbf Datasheet - Page 12

• Manufacturer Part Number: ltc4268cdkd-1-trpbf
• Description: High Power Pd With Synchronous Noopto Flyback Controller
• Manufacturer: Linear Technology Corporation

LTC4268-1
BLOCK DIAGRAM
12
18
15
13
11
23
12
1
2
3
4
5
6
7
15.3V
SHDN
NC
R
I
V
V
V
UVLO
OSC
SYNC
t
PGDLY
ENDLY
ON
LIM_EN
CLASS
PORTN
PORTN
PORTN
+
–
OSCILLATOR
V
CC
UVLO
REFERENCE
1.237V
(V
I
UVLO
FB
)
20V
1400mA
750mA
+
–
300mA
SET
TSD
UVLO
+
–
1.237V
CONTROL
CIRCUITS
REGULATOR
CLASSIFICATION
CURRENT LOAD
INTERNAL
BLOCK
LOGIC
CURRENT TRIP
SLOPE COMPENSATION
–
+
–
+
ENABLE
PGATE
SGATE
3V
0.7
1.3
INPUT
CURRENT
LIMIT
CLAMPS
BOLD LINE INDICATES
HIGH CURRENT PATH
16k
S
R
COMPARATOR
–
+
CURRENT
Q
Q
25k
COLLAPSE DETECT
TO FB
ERROR AMP
14V
–
+
–
+
+
–
1V
GATE DRIVE
GATE DRIVE
+
R
50k
CMPF
3V
OVERCURRENT
FAULT
–
V
V
CC
CC
–
+
–
CURRENT
SENSE AMP
LOAD
COMPENSATION
+
PWRGD
PWRGD
V
SENSE
SENSE
PORTP
V
V
V
V
C
R
SFST
GND
NEG
NEG
NEG
V
CMP
CMP
CMP
NC
CC
PG
SG
42681 BD
FB
–
+
32
31
30
29
28
27
26
10
16
17
14
19
20
21
22
24
33
9
42681fa