LTC4253/LTC4253A
23
425353aff
For more information www.linear.com/4253
APPLICATIONS INFORMATION
4253 F08
GATE
START-UP
INITIAL TIMING
V
LKO
V
GATEL
GND  V
EE
 OR
(48RTN)  (48V)
UV/OV
V
IN
TIMER
GATE
SENSE
V
OUT
1  2
3 4 56   7  89
SS
DRAIN
PWRGD1
A B
PWRGD2
PWRGD3
SQTIMER
EN2
EN3
C
D
V
IN
 CLEARS V
LKO
, CHECK UV > V
UVHI
 (V
UV
 FOR THE LTC4253A), OV < V
OVLO
(V
OV
  V
OVHST
 FOR THE LTC4253A),
RESET < 0.8V, GATE < V
GATEL
, SENSE < V
CB
, SS < 20 " V
OS
 AND TIMER < V
TMRL
TIMER CLEARS V
TMRL
, CHECK GATE < V
GATEL
, SENSE < V
CB
 AND SS < 20 " V
OS
V
SQTMRH
5礎
5礎
V
SQTMRH
V
IH
V
IH
V
TMRH
V
ACL
V
CB
V
TMRL
20 " (V
ACL
 + V
OS
)
20 " (V
CB
 + V
OS
)
20 " V
OS
5礎
50礎
5礎
5礎
50礎
50礎
V
DRNCL
V
DRNL
V
IN
  V
GATEH
200礎 + 8 " I
DRN
Figure 8. System Power-Up Timing (All Waveforms Are Referenced to V
EE
)
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