Faster PWMPAL

Archiver

Is there a PWM controller available similar to
PWMPAL but with a much higher frequency?
Thanks,
Tom Fisher
Dallas,TX

Archiver

--- In basicstamps@yahoogroups.com, "tboonefisher"
<tboonefisher@s...> wrote:
> Is there a PWM controller available similar to
> PWMPAL but with a much higher frequency?
> Thanks,
> Tom Fisher
> Dallas,TX


Higher input or output ?

Look at a Digital to Analogue (DAC) chip as an alternative.

I'm not sure why a higher frequency would be desired. the PWM is
generated in the software so has the limitation of the program in the
BS.

Then it's output is often filtered by an R/C into an op-amp, so a
single pwm output can have a steady state of some value for quite a
long time.

A rapid change may be more easily done by a DAC.

Just some thoughts.

Dave

Archiver

> Higher input or output ?
> Look at a Digital to Analogue (DAC) chip as an alternative.
> I'm not sure why a higher frequency would be desired. the PWM is
> generated in the software so has the limitation of the program in the
> BS.
> Then it's output is often filtered by an R/C into an op-amp, so a
> single pwm output can have a steady state of some value for quite a
> long time.
> A rapid change may be more easily done by a DAC.
> Just some thoughts.
> Dave

I'm trying to use the PWMPAL to drive a power FET(via a FET driver) to
control
an 8V 10amp brushed DC motor's speed. It works fine as long as
I keep the frequency above 10KHz but this only allows 6 speeds.
Tom Fisher