[TCML] SISG Damage Report

[piranha]

Hi,

LittleFuse messed up the Teccor data sheets... Figure 3 here in the 
middle left shows the connection:

http://dkc3.digikey.com/PDF/T082/P1277.pdf

Our 300V SIDACs are actually two 150V SIDACS. The middle pin and the tab 
are 150V to each of the two outside pins.

I short two tabs together which bypasses two of the 150V internal SIDACs 
(one on each device) to reduce the voltage by 300V.

Terry



FIFTYGUY at aol.com wrote:
>  
>  
> In a message dated 5/17/08 6:39:30 P.M. Eastern Daylight Time,  
> bartb at classictesla.com writes:
>
>  
>   
>> If you do heatsink the Sidac's, I expect you'll tie all 3 Sidac's  
>> together at each module?
>>     
>  
>     No, definitely not! Keep them all electrically  isolated in every way! 
> I'm thinking of gluing a little solid piece  of aluminum to each one. I didn't 
> see any off-the-shelf heatsinks that  would lend themselves well to the 
> packages and spacing requirements.Even then,  they could be physically mounted to the 
> same heatsink, so long as they were  electrically isolated from each other.
>  
>   
>> 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).  
>>     
>
> >From the way Terry tied SIDAC tabs together with  brass screws to short them 
> out (for Piranha II tests), it would appear the  tabs are definitely 
> electrically hot and tied to one of the leads.
>  
>