Re: [TCML] SISG Damage Report

["Peter Terren" <pterren@xxxxxxxxxxxx>]

I've certainly made the SIDAC's in the module hot by trying to run a 
ridiculously small coil at ?1MHz.   I suspect that in normal use the heating 
is minimal and that the low current SIDAC variety (easier to get) will be 
OK. I would be a bit surprised if heatsinks helped.  Has anyone measured the 
temp with an IR thermometer?
Peter
www.tesladownunder.com

----- Original Message ----- 
From: "bartb" <bartb@xxxxxxxxxxxxxxxx>

> Hi Phil,
>
> If you do heatsink the Sidac's, I expect you'll tie all 3 Sidac's together 
> at each module? I would be interested if that causes any problems. I don't 
> expect it to as the tab (pin 2) is not tied to anything on the board, but 
> not sure if tying pin 2 to the other Sidac's would cause any changes in 
> switching (I'm not sure where it's tied internally and the data sheet 
> simply says not to use pin 2). But if the Sidac's are getting hot, then it 
> makes sense to sink them. However, if it's simply due to a strike and the 
> Sidac's are remaining cool, then sinking the Sidac's won't help.
>
> Something that has confused me a little here is that you think the boards 
> took direct strikes. If that's the case, the Sidac's aren't really the 
> problem. They are however the sharpest point on the board and are probably 
> likely to be hit by a strike if allowed. I'm curious, are they getting 
> hot!
>
> Take care,
> Bart
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