LTC4253/LTC4253A
27
425353aff
For more information www.linear.com/4253
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
4253 F11
OV DROPS BELOW V
OVLO
 (V
OV
 V
OVHST
 FOR THE LTC4253A), CHECK GATE < V
GATEL
, SENSE < V
CB
 AND SS < 20 " V
OS
OV OVERSHOOTS V
OVHI
 (V
OV
 FOR THE LTC4253A). 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
5礎
50礎
50礎
5礎
200礎 + 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
4253 F12
CB TIMES-OUT
CB TIMES-OUT
V
TMRH
V
ACL
V
CB
V
ACL
V
CB
5礎
5礎
V
DRNCL
200礎 + 8 " I
DRN
200礎 + 8 " I
DRN
V
TMRH
V
ACL
V
CB
V
DRNCL
200礎 + 8 " I
DRN
V
TMRH
Figure 11. Overvoltage Timing (All Waveforms Are Referenced to V
EE
)
Figure 12. Circuit Breaker Timing Behavior (All Waveforms Are Referenced to V
EE
)
(12a) Momentary Circuit Breaker Fault
(12b) Circuit Breaker Time-Out
(12c) Multiple Circuit Breaker Fault
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