Datasheet > SMH4802_09

SMH4802_09

更新时间： 2022-03-25 08:54:09

品牌	Logo	应用领域
SUMMIT		控制器
页数	文件大小	规格书
19页	631K
描述
Programmable -48V Hot-Swap Controller with Forced Shut Down

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

SMH4802_09 数据手册

SMH4802

Preliminary Information

GENERAL DESCRIPTION

The SMH4802 is an integrated power controller for hot components. Duringthecontrolledturn-onperiodtheV_DS

swappableadd-incards. Thedeviceoperatesfromawide of the MOSFET is monitored by the DRAIN SENSE input.

supply range and generates the signals necessary to When DRAIN SENSE drops below 2.5V, and VGATE is

greater than V_DD– V_GT, the PG# output can begin turning

drive an isolated output DC/DC converter. As a typical

add-in board is inserted into the powered backplane, on the DC/DC converter.

physical connections must first be made with the chassis

Steady state operation is maintained as long as all

to discharge any electrostatic voltage potentials. The

board then contacts the long pins on the backplane that

provide power and ground. As soon as power is applied,

the device starts up, but does not immediately apply

powertotheoutputload. Under-voltageandover-voltage

circuits inside the controller verify the input voltage is

within the user-specified range.

conditions are normal. Any of the following events may

cause the device to disable the DC/DC controller by

shutting down the power MOSFET: an under-voltage or

over-voltage condition on the host power supply; an over-

current event detected on the CBSENSE input; a failure

ofthepowerMOSFETsensedviatheDRAINSENSEpin;

the master enable (EN/TS) falling below 2.5V; or the FS#

input being driven low by events on the secondary side of

the DC/DC controller. If one of these events occurs the

SMH4802 can be configured so VGATE shuts off and

either latches into an off state or recycles power after a

Oncetheserequirementsaremet, thehot-swapcontroller

enables VGATE to turn on the external power MOSFET.

TheVGATEoutputiscurrentlimitedtoI_VGATE,allowingthe

slew rate to be easily modified using external passive

cooling down period, t_CYC

FUNCTIONAL BLOCK DIAGRAM

12VREF

VDD

PROGRAMMABLE

SHUTDOWN

TIMER

FS#

–

DRAIN

SENSE

5.0VREF

200kΩ

–

EN/TS

PROGRAMM-

ABLE

DELAY

–

Prog.

Ref.

PG#

–

PROGRAMM-

ABLE

DELAY

12V

2.5V

OV/UV

FILTER

VSS

VGATE

SENSE

50kΩ

SCL

SDA

I C INTERFACE

LOGIC

VGATE

PROGRAMMED

DELAY

–

DUTY

CYCLE

TIMER

50mV

CBSENSE

–

PROGRAMMED

Quick-Trip

2062 BD

Figure 2. Functional Block diagram. Pin numbers reflect SOIC package.

2062 2.4 03/27/09

SUMMIT MICROELECTRONICS, Inc.

123 4 5 6 7...19

下载PDF

与SMH4802_09相关器件

型号	品牌	描述	获取价格	数据表
SMH4803	SUMMIT	Distributed Power Hot-Swap Controller	获取价格
SMH4803A	SUMMIT	Distributed Power Hot Swap Controller	获取价格
SMH4803AEK	SUMMIT	Distributed Power Hot-Swap Controller	获取价格
SMH4803AEKP	SUMMIT	Distributed Power Hot-Swap Controller	获取价格
SMH4803AEL	SUMMIT	Distributed Power Hot-Swap Controller	获取价格
SMH4803AELP	SUMMIT	Distributed Power Hot-Swap Controller	获取价格