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AN443 APPLICATION NOTE

Figure 10. Junction capacitance versus reverse voltage (example: BYT261PIV-1000)

When D1 has evacuated all its stored charge, it is equivalent to a capacitor CJ1 and the other diodes D2,

D3 ... Dn are equivalent to a capacitor which is the sum of the junction capacitance CJ2, CJ3 ... CJn and

the capacitancer

Figure 11 shows the equivalent circuit

CJ1, CJ2; ....CJn, play the role of sharing capacitors.

Putting

We have

Auxiliary capacitors are not necessary if

C

D

∆Q

–

()

V

M

V

1

–

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

=

V1

V2

V3

Vn

+VM

D1

D2

D3

Dn

CJ1

CJ2

CJ3

CJn

C

D

C

D

C

D

C

J2

C

C

V

M

V

RRM

–

n1

–

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

==

V

1

∆Q

–

() V

+

C

+

() C

Jn

+

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

=