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Design Calculations

14.6 SW FET

Calculate maximum peak SW FET current:

(43)

Calculate maximum RMS SW FET current:

(44)

Calculate maximum power dissipation:

(45)

14.7 Current Limit

Calculate peak inductor current limit:

(46)

Power dissipation:

(47)

Resulting component choice:

(48)

14.8 Re-circulating Diode

Maximum reverse blocking voltage:

(49)

Maximum peak diode current:

(50)

Maximum RMS diode current:

(51)

Maximum power dissipation:

(52)

Resulting component choice:

(53)

SNOA559B–October 2011–Revised May 2013 AN-2127 LM3448 A19 Edison Retrofit Evaluation Board

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