LTC1422 Linear Technology, LTC1422 Datasheet - Page 13

• Manufacturer Part Number: LTC1422
• Description: Hot Swap Controller
• Manufacturer: Linear Technology

APPLICATIONS
48V
+
–
48V
+
–
FUSE
FUSE
MMBT5551LT1
R1
36k
5%
R2
1.2k
5%
MMBT5551LT1
R1
36k
5%
R2
1.2k
5%
U
INFORMATION
Q2
U
Q2
CIRCUIT TURNS ON WHEN V
CIRCUIT FOR ACTIVE LOW TURN-ON MODULES
C1
0.47 F
25V
C1
0.1 F
25V
CIRCUIT TURNS ON WHEN V
CIRCUIT FOR ACTIVE HIGH TURN-ON MODULES
W
1
2
3
4
1
2
3
4
Figure 12. Switching 48V to an AT&T Module
Figure 13. Switching 48V to a Vicor Module
RESET
ON
TIMER
GND
RESET
ON
TIMER
GND
LTC1422
LTC1422
SENSE
GATE
SENSE
U
GATE
V
FB
V
CC
IN
FB
CC
> 38V
8
7
6
5
IN
8
7
6
5
> 38V
R5
10k
5%
R5
10k
5%
D1
7.5V
1N755A
D1
7.5V
1N755A
C4
1 F
25V
C4
1 F
25V
R6
1M
5%
R7
270k
5%
R6
1M
5%
R7
270k
5%
PRECHARGE RESISTOR
PRECHARGE RESISTOR
C2
0.1 F
25V
C2
0.1 F
25V
OPTIONAL
OPTIONAL
510
IRF530
5%
510
R4
100 F
IRF530
5%
R8
Q1
100V
100 F
Q1
100V
C3
R3
10
5%
C3
R3
10
5%
+
+
R4
5.1k
5%
V
V
+
_
IN
IN
JW050A1-E
+
–
VI-J30-CY
ON/OFF
GATE IN
AT&T
50W
VICOR
SENSE
SENSE
V
V
Q3
MMBT5551LT1
OUT
OUT
LTC1422
+
+
–
–
+
_
1422 F13
1422 F12
5V
5V
13