©2011 Fairchild Semiconductor Corporation

9

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FDDS100H06_F085 Rev. 1.0.0

Energy stored in load inductance:

E

L

12



LI

L

2



=

While demagnetizing load inductance, the energy dissipated in MOSFET is

E

AS

E

bb

E

L

E

R

–

+

V



ON CL



i

dt



==

with an approximate solution for RL > 0 :

E

AS

I



2R

L



--------------- V

ON CL





1

I



V

OUT CL



-----------------------------

+





ln

=