>
>At 07:50 AM 2/3/2000 -0700, you wrote:
>>>
>>>That's the half cycle (8.3 ms), non-repetitive rating Peter. Max
>>>continuous rating is 3 amps at some max operating temp.
>>
>>As I understand it, a rating of say 8.3mS indicates the period of the
>>allowable repetitive peak.
>>
>
>No. 8.3ms is the time of one-half cycle of a complete cycle @ 60Hz. One
>full cycle is 16.67ms.
>uThe surge rating of 200 amps (in this case) is only
>valid for this half cycle.
Don't most rectifiers conduct in half-cycles?
>In other words, the diode is only "guaranteed"
>to take it once. So 8.3ms is the period of the one-time forward surge. This
>normally noted as "I fm" or "Surge" on the data sheets. It isn't
>"guaranteed" to take it for a full cycle, or in any repetition of
>succeeding cycles.
So, once the rated one-time one-cycle surge of 200a has been used up,
any current greater than 3A could be expected to cause immediate diode
failure?
cheers
- Rich..., 805.386.3734, www.vcnet.com/measures.
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|