SMH4802(2009) View Datasheet(PDF) - Summit Microelectronics

Part Name

Description

MFG CO.

SMH4802
(Rev.:2009)

Programmable -48V Hot-Swap Controller with Forced Shut Down

Summit Microelectronics 

APPLICATIONS INFORMATION (Continued)

SMH4802

Preliminary Information

2.5V

UV

tPUVF

VGATE

2062 Fig04

Figure 4. Under-/Over-Voltage Filter Timing

CBSENSE

tCBD

VGATE

50mV

tCYC

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 tCBD timing.

VDD

UV

OV

11 ≤ VDD ≤ 13

tSD

2.5VREF

<tPUVF

<tPOVF

VGATE

DRAIN

SENSE

CBSENSE

5V

50mVREF

VDD – VGT

VDD

2.5VREF

<tCBD

PG#

tPGD

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 2.4 03/27/09

2062 Fig06

9

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