Re: [TCML] SISG circut question

[piranha <piranha@xxxxxxxxxx>]

Hi Phil,

I measure about 21pF across them which matches the data sheet for the 
300V devices. I can't imagine that would hurt anything. The energy 
storage is 1uJ which is nothing. The RC time constant is 21uS which is 
vastly faster than the 60 Hz AC. As the coil is firing, they are all 
shorted out so they should not have any effect then.

Terry


FIFTYGUY@xxxxxxx wrote:
> Terry-
>  
>     Thanks for the IGBT's!
>  
>     At work I had to repair a blown PLC power supply,  and in the process of 
> ordering parts, I looked hard at the spec sheets  for TVS diodes. Some of 
> these things have capacitances of a few  nF!
>  
>  _http://www.microsemi.com/micnotes/110.pdf_ 
> (http://www.microsemi.com/micnotes/110.pdf) 
>  
>     Does this affect the timing of the SISG? Maybe  explain the deviation 
> from the theoretical values you calculated? Not that it's  difficult to tweak or 
> anything. But I'm not an "electronics guy", so I wondered  if you had already 
> accounted for the effect if it made a difference.
>  
>     Got my SIDACs from Mouser yesterday. It's not fun  repairing the boards 
> when the leads have become welded into the solder pads, and  the fiberglass has 
> been cratered under the traces. 
>  
> -Phil LaBudde
> Center for the Advanced Study of Ballistic  Improbabilities
>
>
>
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>   

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