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18
LTC4212
4212f
OPERATIO
Figure 4. Power-Up with Overcurrent, Slow Comparator Trips the Circuit Breaker
V
CC
V
CC
ON
V
REF
2.34V
V
REF
TIMER
GATE
DC/DC
CONVERTER
OUTPUT
V
CC
  V
SENSE
FAULT
PGT
PGI
PGF
4212 F04
1
2
3
4   5  6
7
8   9
10  11
13
12
1415
16
POWER GOOD TIMER
ENABLED (C
PGT
)
0.95V
0.65V
2ND TIMING
CYCLE (C
TIMER
)
1ST TIMING
CYCLE (C
TIMER
)
1ST TIMING
CYCLE (C
TIMER
)
SOFT-START
ACTIVE
V
REF
V
CC
  V
SENSE
 = 50mV
> 50mV, >18祍
It consists of the time the FAULT pin takes to discharge
C
AUTO
 (Time Points 9 to 10), the 120祍 needed to reset the
circuit breaker (Time Points 9 to 11), the time it takes the
pull-up resistor at the ON pin to charge C
AUTO
 above
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).
Sense Resistor Considerations
The fault current level at which the LTC4212s internal
electronic circuit breaker trips is determined by a sense
resistor connected between the LTC4212s V
CC
 and SENSE
pins and two separate trip points. The first trip point is set
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