ltc1645cs8-trpbf Linear Technology Corporation, ltc1645cs8-trpbf Datasheet - Page 11

• Manufacturer Part Number: ltc1645cs8-trpbf
• Description: Dual-channel Hot Swap Controller/power Sequencer
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
Supply Glitching
LTC1645 Hot Swap circuits on the backplane are generally
used to provide power-up/down sequence at insertion/
removal as well as overload/short-circuit protection. If a
short-circuit occurs at supply ramp-up, the circuit breaker
(a) V
CC
Short-Circuit Supply Current Glitch Without Any Limiting
(c) V
with 2 H Series Inductor
CC
Short-Circuit Supply Current Glitch
U
U
1 s/DIV
1 s/DIV
12V
W
+
–
1645 F08a
1645 F08c
SUPPLY
GLITCH
+
100 F
U
Figure 8. Supply Glitch
0.01
LTC1645
R1
IRF7413
trips. The partially enhanced FET is easily disconnected
without any supply glitch.
If a dead short occurs after a supply connection is made
(Figure 8), the sense resistor R1 and the R
fully enhanced FET provide a low impedance path for
10
2 H
0.1 F
(d) V
1645 F08
GATE
(b) V
GATE
V
V
CC
CC
CC
CC
Supply Glitch with 2 H Series Inductor
Supply Glitch Without Any Limiting
1 s/DIV
1 s/DIV
1645 F08b
1645 F08d
LTC1645
DS(ON)
11
of the
1645fa