8 to 16 amps at 12V PWM with duty cycles between 50 and 100%.  I am using a
cascaded Mosfet switch to both drive the current and to isolate the 12V side
from the logic side.  I am keeping the frequency at 5kHz - well above the
2kHz stress point.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Michael Rigby-Jones
Sent: Thursday, 6 February 2003 2:14 am
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: Driving multiple PWM outputs from 1 PIC


> -----Original Message-----
> From: Ian McLean [SMTP:ianmclean@OPTUSHOME.COM.AU]
> Sent: Wednesday, February 05, 2003 3:06 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]: Driving multiple PWM outputs from 1 PIC
>
> The problem I see with an LC filter is picking a good inductor value.
> Because I am drawing large amounts of current, the inductor cannot be too
> small.  But it cannot be too large either or I will getting ringing on my
> power supply side.  Any suggestions for a good combo for cap and choke to
> do
> the job ?
>
>
What sort of current are you talking about?  You can get some high current
surface mount inductors that are still quite physicaly small.  Obviously the
higher the PWM frequency the better, as smaller value components can be
used.

Regards

Mike

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