ST1S32

Application information

Doc ID 023246 Rev 1

19/29

Equation 24

equivalent switching time is 20 ns.

c)

Quiescent current losses, calculated as:

Equation 25

Equation 26

calculated as the parallel of many paths of heat conduction from the junction to the ambient.

For this device the path through the exposed pad is the one conducting the largest amount

40 °C/W for the VFDFPN package.

P

SW

V

IN

I

OUT

T

RISE

T

FALL

+

()

2

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

Fsw

⋅⋅

⋅

V

IN

I

OUT

T

SW

F

SW

⋅⋅

⋅

==

P

Q

V

IN

I

Q

⋅

=

T

J

T

A

Rth

JA

P

TOT

⋅

+

=