AN4021

Reverse losses: Basic equations

Doc ID 022588 Rev 1

5/10

2

Reverse losses: Basic equations

Reverse losses expression is the average dissipated power in the diode during the reverse

biasing phase:

Equation 3

In case of a typical square waveform as illustrated on Figure 1, the reverse losses are equal

to:

Equation 4

Substitution of Equation 1 into Equation 4 yields

Equation 5

In some literature, it is possible to find the following expression:

Equation 6

With:

Equation 7

dt

T

V

I

t

V

T

T

P

sw

T

j

R

R

R

sw

j

REV

·

·

=

∫

0

)

,

(

)

(

1

)

(

)

,

(

)

1

(

)

(

j

R

R

R

j

REV

T

V

I

V

T

P·

·

-

=d

)

(

Re

Re

)

,

(

)

1

(

)

(

f

j

T

c

f

j

R

R

R

j

REV

e

T

V

I

V

T

P

-

·

·

·

-

=d

)

(

Re

)

(

f

j

j T

T

c

ref

j

REV

e

P

T

P

-

·

·

=

()

f

j

R

R

R

ref

T

V

I

V

P

Re

,

)

1

(·

·

-

=d