Datasheet > SMH4811A_09

SMH4811A_09

更新时间： 2022-05-07 08:47:33

品牌	Logo	应用领域
SUMMIT		控制器
页数	文件大小	规格书
15页	936K
描述
Programmable Distributed Power Hot-Swap Controller for High-Availability Systems

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SMH4811A_09 数据手册

SMH4811A

Preliminary

Under-/Over-Voltage Filtering

Under-Voltage Hysteresis

The SMH4811A may also be configured so that an out of The Under-Voltage comparator input may be configured

tolerance condition on UV/OV will not shut off the output with a programmable level of hysteresis. The compare

immediately. Instead,afilterdelaymaybeinsertedsothat level may be set in steps (up to 15) of 62.5mV below 2.5V.

only sustained under-voltage or over-voltage conditions The default under-voltage hysteresis level is set to

will shut off the output. When the UV/OV filter option is 62.5mV.

enabled an out of tolerance condition on UV or OV for

Soft Start Slew Rate Control

longer than the filter delay time, t_UOFLTR, activates the

FAULT# output, and the VGATE and PG outputs will be

latched in the off state. To initiate another power-up

sequence the FAULT# output must first be reset. Refer to

the appropriate section on resetting the FAULT# output.

The Under-/Over-Voltage Filtering feature is disabled in

the default configuration of the device.

Once all of the preconditions for powering up the DC/DC

controller have been met, the SMH4811A provides a

means to soft start the external power FET. It is important

to limit in-rush current to prevent damage to the add-in

cardordisruptionstothehostpowersupply. Forexample,

11 ≤ V

≤ 13

PUVF

2.5V

REF

PD1# +

PD2#

PDD

– V

VGATE

2.5V

REF

DRAIN

SENSE

50mV

REF

CBSENSE

CBD

PG#

ENPG

2044 Fig02 5.0

Figure 2. Complete Power On Timing Sequence

2044 6.6 03/27/09

SUMMIT MICROELECTRONICS, Inc.

1...4 5 678 9 10...15

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