19
LTC4212
4212f
OPERATIO
Figure 5. LTC4212 Autoretry Application
+
V
CC
SENSE
LTC4212
9
1
10
2
3
8
7
10礔
+
10礔
2
3
1
5V
2.5V
1.5A
3.3V
1.5A
4212 F05
6
GATE
PGT
4
PGF
TIMER
C
TIMER
0.01礔
PGI
ON
V
CC
5V
GND
Z1 = SMAJ10A (TVS)
R
AUTO
1M
R
X
10&
R
SENSE
0.007&
EDGE
CONNECTOR
(MALE)
M1
Si4410DY
Z1
R4
10k
R6
2.1k
R5
10k
R
G
100&
FAULT
GND
+
10礔
LT1963-2.5
C
PGT
180nF
C
PGF
18pF
C
X
10nF
BACKPLANE
CONNECTOR
(FEMALE)
5
+
10礔
2
3
1
+
10礔
LT1963-3.3
4
3
LTC1326-2.5
GND
V
CCA
1
V
CC3
6
RST
2
V
CC25
C
AUTO
2礔
Figure 6. Autoretry Sequence
V
CC
ON
V
REF
2.34V
TIMER
GATE
DC/DC
CONVERTER
OUTPUT
V
CC
  V
SENSE
FAULT
PGT
PGI
PGF
4212 F06
1 2   3
4  5  6
7  8
10
9
11   12
131415
16  17
18   19
POWER GOOD
TIMER ENABLED
(C
PGT
)
POWER GOOD
TIMER ENABLED
(C
PGT
)
0.95V
0.65V
0.95V
0.65V
2ND
TIMING
CYCLE (C
TIMER
)
1ST
TIMING
CYCLE (C
TIMER
)
1.316V
1.31V
0.455V
0.455V
2ND
TIMING
CYCLE (C
TIMER
)
1ST
TIMING
CYCLE (C
TIMER
)
SOFT-START ACTIVE
SOFT-START ACTIVE
V
REF
V
REF
V
REF
V
CC
  V
SENSE
 =
50mV
V
CC
  V
SENSE
 =
50mV
> 50mV, > 18祍
> 50mV, > 18祍
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