SMH4803AS datasheet(8/19 Pages) SUMMIT

部件名	SMH4803AS

功能描述	Distributed Power Hot Swap Controller

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制造商	SUMMIT [Summit Microelectronics, Inc.]

网页	http://www.summitmicro.com

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8 / 19 page

8

SMH4803A

2051 4.4 3/15/01

Preliminary

SUMMIT MICROELECTRONICS, Inc.

TIMING RELATIONSHIPS

Figure 1 illustrates some of the power on sequences,

including the UV and OV differentials to their reference,

and Power Good cascading.

Figure 1. Complete Power On Timing Sequence

Figures 2, 3, and 4 indicate the affect on the VGATE

signal caused by different Circuit Breaker inputs. In

Figure 2 RESET# and MODE are high; in Figure 3

MODE is low. Figure 4 shows the Quick Trip mode.

VDD

2051 Fig01 1.1

UV

OV

PD1#/

PD2#

VGATE

DRAIN

SENSE

2.5VREF

11

≤ VDD ≤ 13

tPDD

PG1#

PG2#

PG3#

ENPGB

tPGD

<tPUVF

50mVREF

<tCBD

ENPGA

CBSENSE

5V

VDD

VDD – VGT

tPGD

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