LTC4354CS8 datasheet(1/12 Pages) LINER

Numer części	LTC4354CS8

Szczegółowy opis	Negative Voltage Diode-OR Controller and Monitor

PDF	12 Pages

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Producent	LINER [Linear Technology]

Strona internetowa	http://www.linear.com

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LTC4354

1

4354f

TYPICAL APPLICATIO

APPLICATIO S

FEATURES

DESCRIPTIO

The LTC

®4354 is a negative voltage diode-OR controller

that drives two external N-channel MOSFETs. It replaces

two Schottky diodes and the associated heatsink, saving

power and area. The power dissipation is greatly reduced

by using N-channel MOSFETs as the pass transistors.

Power sources can easily be ORed together to increase

total system power and reliability.

When first powered up, the MOSFET body diode conducts

the load current until the pass transistor is turned on. The

LTC4354 servos the voltage drop across the pass transis-

tors to ensure smooth transfer of current from one tran-

sistor to the other without oscillation.

The MOSFETs are turned off in less than 1µs whenever the

corresponding power source fails or is shorted. Fast turn-

off prevents the reverse current from reaching a level that

could damage the pass transistors.

A fault detection circuit with an open drain output capable

of driving an LED or opto-coupler indicates either MOSFET

short, MOSFET open or supply failed.

■ AdvancedTCA

® Systems

■ –48V Distributed Power Systems

■

Computer Systems/Servers

■ Telecom Infrastructure

■ Optical Networks

, LTC and LT are registered trademarks of Linear Technology Corporation.

■ Controls N-Channel MOSFETs

■ Replaces Power Schottky Diodes

■ 1µs Turn-off Time Limits Peak Fault Current

■ 80V Operation

■ Smooth Switchover Without Oscillation

■ No Reverse DC Current

■ Fault Output

■ Selectable Fault Thresholds

■ Available in 8-Pin (3mm × 2mm) DFN and 8-Pin SO

Packages

Negative Voltage

Diode-OR Controller

and Monitor

–48V Diode-OR

LTC4354

LOAD

DB

GA

DA

GB

VSS

VB = –48V

VA = –48V

–48V_RTN

FAULT

IRF3710

4354 TA01

VCC

33k

12k

2k

LED

1µF

Power Dissipation vs Load Current

CURRENT (A)

0

1

2

3

4

6

5

2

46

4354 TA01b

810

DIODE (MBR10100)

FET (IRF3710)

POWER

SAVED

AdvancedTCA is a registered trademark of the PIC Industrial Computer Manufacturers Group.

Podobny numer części - LTC4354CS8

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