Datasheet

LTC4253B
26
4253bf
applicaTions inForMaTion
V
ACL
V
CB
V
IN
– V
GATEH
OV
TIMER
GATE
SENSE
SS
1 2 34 5 6 7 8 9
GATE
START-UP
4253b F10
OV DROPS BELOW V
OVLO
, CHECK GATE < V
GATEL
, SENSE < V
CB
AND SS < 20 • V
OS
OV OVERSHOOTS V
OVHI
. GATE AND SS ARE PULLED DOWN, PWRGD SIGNALS AND TIMER ARE UNAFFECTED
V
OVHI
V
OVLO
V
TMRH
V
GATEL
20 • (V
ACL
+ V
OS
)
20 • (V
CB
+ V
OS
)
20 • V
OS
5µA
50µA
50µA
5µA
200µA + 8 • I
DRN
CB FAULT CB FAULT CB FAULT CB FAULT
1 2 1 2 1 2 3 4
TIMER
GATE
SENSE
V
OUT
SS
DRAIN
PWRGD1
TIMER
GATE
SENSE
V
OUT
SS
DRAIN
PWRGD1
TIMER
GATE
SENSE
V
OUT
SS
DRAIN
PWRGD1
4253b F11
CB TIMES-OUTCB TIMES-OUT
V
TMRH
V
ACL
V
CB
V
ACL
V
CB
5µA
5µA
V
DRNCL
200µA + 8 • I
DRN
200µA + 8 • I
DRN
V
TMRH
V
ACL
V
CB
V
DRNCL
200µA + 8 • I
DRN
V
TMRH
Figure 10. Overvoltage Timing (All Waveforms Are Referenced to V
EE
)
Figure 11. Circuit Breaker Timing Behavior (All Waveforms Are Referenced to V
EE
)
(11a) Momentary Circuit Breaker Fault (11b) Circuit Breaker Time-Out (11c) Multiple Circuit Breaker Fault