SMB117 datasheet(26/32 Pages) SUMMIT

26 / 32 page

SMB113A/B/SMB117/A

Preliminary Information

Summit Microelectronics, Inc

2111 2.4 6/24/2008

APPLICATIONS INFORMATION (CONTINUED)

The input capacitance must be chosen such that the

rise and fall times specified in the datasheet do not

exceed ~5% of the switching period.

To ensure the maximum load current will not exceed

the power rating of the FET, the power dissipation of

each FET must be determined. It is important to look

at each FET individually and then add the power

dissipation of complementary FETs after the power

dissipation over one cycle has been determined. The

Power dissipation can be approximated as follows:

Equation 3:

DSON

Where TON is the on time of the primary switch. TON

can be calculated as follows:

Equations 4, 5:

PFET

Buck

NFET

Buck

)

(

−

Compensation:

Summit provides a design tool to called Summit Power

Designer”

that

will

automatically

calculate

the

compensation values for a design or allow the system

to be customized for a particular application. The

power

designer

software

can

found

http://www.summitmicro.com/prod_select/xls/SummitP

owerDesigner_Install.zip.

SMB117 Fiches technique(PDF) 26 Page - Summit Microelectronics, Inc.

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