LTC1645CS8 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1645CS8

Dual-Channel Hot Swap Controller/Power Sequencer

Linear Technology 

LTC1645

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

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 RDS(ON) of the

fully enhanced FET provide a low impedance path for

SUPPLY

GLITCH

R1

0.01Ω IRF7413 2µH

10Ω

+

12V –+

100µF

LTC1645

0.1µF

1645 F08

GATE

1µs/DIV

1645 F08a

(a) VCC Short-Circuit Supply Current Glitch Without Any Limiting

VCC

1µs/DIV

1645 F08b

(b) VCC Supply Glitch Without Any Limiting

GATE

VCC

1µs/DIV

1645 F08c

1µs/DIV

1645 F08d

(c) VCC Short-Circuit Supply Current Glitch

with 2µH Series Inductor

(d) VCC Supply Glitch with 2µH Series Inductor

Figure 8. Supply Glitch

11

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