Datasheet

LTC4216
16
4216fa
For more information www.linear.com/LTC4216
applicaTions inForMaTion
Figure 9. Normal Power-Up Sequence (with Analog Current Limiting)
SENSEP
ON
TIMER
SS
GATE
V
OUT
I
LOAD
FILTER
RESET
V
CC
POWER GOOD
V
FB
> 0.6V
LOAD CURRENT REGULATING
AT 40mV/R
SENSE
POWER BAD
V
FB
< 0.6V
(V
GATE
– V
OUT
) > V
GS(TH)
(V
SENSEP
– V
SENSEN
) > 25mV
FILTER RAMPS UP WHEN (V
SENSEP
– V
SENSEN
) > 25mV OUTPUT IN ANALOG CURRENT LIMIT,
(V
SENSEP
– V
SENSEN
) = 40mV
(V
SENSEP
– V
SENSEN
) < 25mV
TRACKS SS RAMP
IN REGULATION
20µA
60µA
2.4µA
V
TMR(TH)
2µA
V
TMR(TH)
2µA
10µA
10µA
1µA
CHECK FOR GATE,
FILTER, TIMER,
SS < 0.2V
CHECK FOR GATE, FILTER, TIMER, SS < 0.2V AND FAULT HIGH
PLUG-IN CYCLE
FIRST TIMING CYCLE
POWER-GOOD DELAY
SECOND TIMING CYCLE
4216 F09
1 2 3 4 5 6 7 8 9 10 11 12 16151413
0.72V
0.4V
0.8V
ELECTRONIC CIRCUIT BREAKER ARMED
RESET
GOES HIGH
IN RESET
MODE
(ON < 0.4V)
ON GOES LOW
(ON < 0.72V)
OUTPUT NO LONGER
IN CURRENT LIMIT
RESET PULLED LOW
DUE TO POWER BAD
2ND TIMING CYCLE CANNOT START WITH
OUTPUT IN ANALOG CURRENT LIMIT
V
FILT(TH)