LTC4212 LINER [Linear Technology], LTC4212 Datasheet - Page 18

• Manufacturer Part Number: LTC4212
• Description: Hot Swap Controller with Power-Up Timeout
• Manufacturer: LINER [Linear Technology]

OPERATIO
LTC4212
It consists of the time the FAULT pin takes to discharge
C
circuit breaker (Time Points 9 to 11), the time it takes the
pull-up resistor at the ON pin to charge C
1.316V (Time Points 11 to 12) and the elapsed time before
the external N-channel starts to conduct during the second
timing cycle (Time Points 12 to 16).
18
AUTO
V
CONVERTER
CC
– V
OUTPUT
TIMER
DC/DC
FAULT
(Time Points 9 to 10), the 120 s needed to reset the
SENSE
GATE
PGT
PGF
V
PGI
ON
CC
1
2.34V
V
CC
U
2
3
Figure 4. Power-Up with Overcurrent, Slow Comparator Trips the Circuit Breaker
CYCLE (C
1ST TIMING
TIMER
V
REF
)
4
5 6
V
AUTO
CC
SOFT-START
– V
CYCLE (C
2ND TIMING
ACTIVE
SENSE
above
7
TIMER
= 50mV
V
0.95V
0.65V
REF
)
POWER GOOD TIMER
8
> 50mV, >18 s
ENABLED (C
Sense Resistor Considerations
The fault current level at which the LTC4212’s internal
electronic circuit breaker trips is determined by a sense
resistor connected between the LTC4212’s V
pins and two separate trip points. The first trip point is set
9
PGT
)
10 11
12
13
1415
CYCLE (C
1ST TIMING
CC
and SENSE
V
TIMER
REF
)
4212 F04
4212f
16