> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Chris Loper
> Sent: 04 August 2009 22:26
> To: piclist
> Subject: [PIC] Lowside PWM motor controller for go-cart
> 
> I know that driving the gate at only 5V is not good,
> and I plan to replace the IR540 with a logic level FET.
> I did a search on Digikey and found this one:
>    DIGIKEY IPP0165N03L G   30V   50A   Rdson=.0065   $1.03
> 
>
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=IPP065N
03
> LGIN-ND
> Datasheet:
>
http://www.infineon.com/dgdl/IPP065N03L_rev1.02.pdf?folderId=db3a3043144
1f
> b5d01148c401f250e27&fileId=db3a30431441fb5d011492371ebc0fe2
> One US dollar!  It seems almost too good to be true.
> Are there other parameters that I need to check?
> 

How many FETs are you planning to use?  Bear in mind that whilst the
full load current of the motor is only ~21Amps, the stall current will
be much, much higher.

What are you driving the FET(s) with?  A PIC pin does not have
sufficient current capability to switch a typical power FET quickly
enough to minimise time in the linear region.

Regards

Mike

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