LM51031 datasheet(9/9 Pages) HTC

No. de pieza	LM51031

Descripción Electrónicos	Fast PFET Buck Controller

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Fabricante Electrónico	HTC [HTC Korea TAEJIN Technology Co.]

Página de inicio	http://www.htckorea.co.kr

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Fast PFET Buck Controller

LM51031

A P−Ch FET with a continuous drain current (ID)

rating greater than the maximum output current is

required. The Gate−to−Source voltage VGS and

Source Breakdown Voltage should be chosen

based on the input supply voltage. The power

dissipation due to the conduction losses is

given by:

where

The power dissipation of the P−Ch FET due to

the switching losses is given by:

where tr = Rise Time.

11) Diode Selection

The flyback or catch diode should be a Schottky

diode because of it’s fast switching ability and

low forward voltage drop. The current rating

must be at least equal to the maximum output

current. The breakdown voltage should be at

least 20 V for this 12 V application. The diode

power dissipation is given by:

HTC

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