Dwayne Reid wrote:
> At 02:18 PM 7/5/2010, RussellMc wrote:
>   
>>> He's finding that the temperature rise is higher than he likes and is
>>> therefore looking for a Mosfet with lower RDSon.
>>> The circuit operates at less than 30 Vdc and he has at least 10V of
>>> gate drive available.
>>> He'd prefer to stay with the current TO-220 package if possible.
>>>       
>
> Many thanks for all the suggestions.  I'm checking into them right now.
>
> The problem is that the original spec was for max Id of 10A. 
>
> Now the customer wants to run somewhere between 15A to 30A through 
> that device.  Unfortunately, the customer doesn't understand (yet) 
> that changing the spec AFTER the board design has been finished, 
> accepted, and is now certified costs money.  Real money.
>
> The easiest way to fix this is to select a different Mosfet - one 
> that has lower RDSon.
>
>   
If the tracks are not big enough for x3 current, then changing the FET 
won't help.

Calculate your track resistances from width, length and thickness.


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