EM5301F datasheet(11/12 Pages) EXCELLIANCE

Part #	EM5301F

Description	12V Synchronous Buck PWM Controller

PDF	12 Pages

Scroll/Zoom	100%

Manufacturer	EXCELLIANCE [Excelliance MOS Corp.]

Direct Link	http://www.excelliancemos.com/

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11 / 12 page

2013/5/2

Rev.A.1

EM5301F/G

Power MOSFET Selection

The EM5301F/G requires two N-Channel power

MOSFETs. These should be selected based upon

on-resistance, breakdown voltage, gate supply

requirement,

and

thermal

management

requirements.

In high current applications, the MOSFET power

dissipation, package selection and heat sink are the

dominate design factor. The power dissipation

includes two loss components: conduction loss and

switching loss. The conduction losses are the

largest component of power dissipation for both

the upper and lower MOSFETs. These losses are

distributed between the two MOSFETs according

to duty factor.

The power dissipations in the two MOSFETs are

approximately the following equation:

OUT

DS(ON)

OUT

UPPER

DS(ON)

OUT

LOWER

Where D is the duty cycle, tSW is the combined

switch ON and OFF time.

EM5301F Datasheet(PDF) 11 Page - Excelliance MOS Corp.