SMH4802 Datasheet, PDF (9/20 Pages) Summit Microelectronics, Inc. – Programmable -48V Hot-Swap Controller with Forced Shut Down

APPLICATIONS INFORMATION (Continued)
SMH4802
Preliminary Information
2.5V
UV
t_PUVF
VGATE
2062 Fig04
Figure 4. Under-/Over-Voltage Filter Timing
CBSENSE
t_CBD
VGATE
50mV
t_CYC
2062 Fig05
Figure 5. Circuit Breaker Cycle Mode
Power-on Timing
Figure 6 illustrates some power on sequences, including the UV and OV differentials to their reference, and Power
Good cascading. Refer to the AC operating characteristics table for more information on the t_CBD timing.
V_DD
UV
OV
11 ≤ V_DD ≤ 13
t_SD
2.5V_REF
<t_PUVF
<t_POVF
VGATE
DRAIN
SENSE
CBSENSE
5V
50mV_REF
V_DD – V_GT
V_DD
2.5V_REF
<t_CBD
PG#
t_PGD
Note: In current regulation mode the DRAIN SENSE signal will not affect the PG# output.
Figure 6. Power On Timing Sequence
SUMMIT MICROELECTRONICS, Inc.
2062 2.3 6/19/03
2062 Fig06
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