Re: Flyback output diode peak curent vs average current
by Adam S <not.valid@[EMAIL PROTECTED]
>
Jul 4, 2008 at 08:23 PM
Mook Johnson wrote:
> In a DCM flyback with its high peak to average current ratio. When
sizing a
> diode do you rate thediode for the maximum peak current. I have a 2A
> average current with 12A peaks at the start of the flyback. Repeats
every
> 5uS.
>
> Which current rating should I look for in the diode? 3A? 6A? 15A?
As others have said it depends on maximum Tj, which depends on ambient
temperature and junction to ambient Rth. A 200A diode will cook itself
in your application if its in a vacuum and attached with thin wires.
