Datasheet > SC4250_05

SC4250_05

更新时间： 2024-09-30 06:10:15

品牌	Logo	应用领域
商升特 - SEMTECH		控制器
页数	文件大小	规格书
12页	251K
描述
Negative Voltage Hot Swap Controller

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SC4250_05 数据手册

SC4250

Negative Voltage

Hot Swap Controller

POWER MANAGEMENT

Description

Features

Programmable slew of the inrush current when

used for hot insertion in the negative 24V and 48V

backplane

The SC4250 is a negative voltage hotswap controller

that allows the insertion of line cards into a live backplane.

The inrush current is programmable, and the closed loop

operation limits the maximum current even under short

circuit conditions. A built-in timing circuit prevents false

shutdown. The signal from the drain voltage is fed to the

timer, providing safety for the MOSFET when in linear

mode. The SC4250 latches off under abnormal condi-

tions The power has to be recycled in order to resume

operation.

Closed loop operation limits the maximum current

even in short circuit condition

Built in timer prevents false shutdown when the

closed loop operation limits the current

Sensing the drain voltage allows for immediate

shutdown in short circuit conditions where current

spikes and noise are ignored

Power good signal

Input UVLO and OVLO sensing

Circuit breaker and retry

SO-8 package

The device comes in two options, PWRGD (SC4250H)

and PWRGD (SC4250L). These high or low signals can

be directly used to enable power modules.

Applications

Central office switching

-48V Distributed power systems

Power supply hotswap & inrush control

Typical Application Circuit

GND

0.1

SC4250

PWRGD/PWRGD

GND(remote)

PWRGD /PWRGD

VCC

DRAIN

GATE

Vee

VEE

562k

3.3nF

18k

150

9.31k

VEE

SENSE

10.2k

0.001

0.33

0.01

-- 48V

Figure 1

Revision: April 6, 2005

www.semtech.com

12 3 4 5 6 7...12

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