LTC4269-1 Linear Technology Corporation, LTC4269-1 Datasheet - Page 12

• Manufacturer Part Number: LTC4269-1
• Description: IEEE 802.3 At PD And Synchronous No-Opto Flyback Controller
• Manufacturer: Linear Technology Corporation

www.DataSheet4U.com
LTC4269-1
BLOCK DIAGRAM
12
18
15
13
11
23
12
25
28
10
1
2
3
4
5
6
7
8 NC
15.3V
SHDN
R
NC
V
V
NC
V
UVLO
OSC
SYNC
t
PGDLY
ENDLY
NC
NC
T2P
ON
CLASS
PORTN
PORTN
CC
+
–
OSCILLATOR
V
CC
UVLO
REFERENCE
1.237V
(V
I
UVLO
FB
)
20V
+
–
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
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
(EXPOSED PAD)
+
PWRGD
PWRGD
V
SENSE
SENSE
PORTP
V
V
V
C
R
SFST
GND
NEG
NEG
CMP
CMP
CMP
NC
PG
SG
42691 BD
FB
–
+
32
31
30
29
27
26
16
17
14
19
20
21
22
24
33
9
42691f