Linear Technology LTC4278 IEEE802.3at PD Controller with 12V Aux, Vout = 5V, Iout = 4.5A DC1561B DC1561B 데이터 시트
제품 코드
DC1561B
LTC4278
12
4278fc
BLOCK DIAGRAM
19
SENSE
–
20
SENSE
+
C
CMP
3V
TO FB
PGATE
SGATE
CURRENT
SENSE AMP
R
CMPF
50k
LOAD
COMPENSATION
–
+
–
+
–
+
–
+
–
+
–
+
–
+
UVLO
0.8V
DISABLE
I
UVLO
18
OSC
15
t
ON
11
PGDLY
23
ENDLY
NC
12
SYNC
13
1.237V
REFERENCE
(V
FB
)
INTERNAL
REGULATOR
UVLO
3V
COLLAPSE DETECT
ERROR AMP
CLAMPS
0.7
1.3
+
–
S
R
R
Q
Q
Q
1V
16
FB
17
V
CMP
14
SFST
TSD
CURRENT TRIP
SLOPE COMPENSATION
CURRENT
COMPARATOR
OVERCURRENT
FAULT
LOGIC
BLOCK
–
+
–
+
21
R
CMP
GATE DRIVE
22
PG
24
SG
9
GND
(EXPOSED PAD)
33
OSCILLATOR
SET
ENABLE
GATE DRIVE
BOLD LINE INDICATES
HIGH CURRENT PATH
14V
32
T2P
2
R
CLASS
3
NC
4
SHDN
PWRGD
V
PORTP
31
NC
1
30
PWRGD
29
25
NC
28
V
NEG
V
NEG
26
CONTROL
CIRCUITS
CLASSIFICATION
CURRENT LOAD
1.237V
–
+
16k
25k
7
V
PORTN
NC
8 NC
10
V
CC
6
27
4278 BD
V
PORTN
5