17
LTC4212
4212f
Figure 3. Power Good Time-Out Fault and ECB Reset Sequence
CHECK FOR GATE < 0.2V
ON GOES LOW
CHECK FOR FAULT HIGH
LOGIC RESET
  (200礎 GATE PULLDOWN)
FAST COMP ARMED
SLOW COMP & POWER GOOD CIRCUIT ARMED
PGI SAMPLED
CIRCUIT BREAKER RESET
V
CC
V
CC
ON
V
REF
2.34V
V
REF
V
REF
TIMER
GATE
DC/DC
CONVERTER
OUTPUT
(RST)
DC/DC
CONVERTER
OUTPUT
(PGOOD)
FAULT
PGT
PGI
PGF
4212 F03
12   3
4  5  6    7
8  9
10
11  12
13
14
15
16   17
19
POWER GOOD
TIME-OUT CYCLE
(C
PGT
)
POWER GOOD TIMEOUT FAULT SEQUENCE
ECB RESET
SEQUENCE
< 200ms
0.95V
0.65V
1ST TIMING
CYCLE (C
TIMER
)
2ND TIMING
CYCLE (C
TIMER
)
SOFT-START
ACTIVE
V
OUT
V
OUT
OPERATIO
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