Depends on the context of the application. In motion control, for example,
you might
want the switching frequency to be above the audible range so 20KHz will do
fine. If
you are working with power conversion then there are other factors to
consider.
As regards articles, you might want to consider the application first and
then do a Google
search on +PWM +Application.

Madhu

>I'd like to know what is the
?best PWM frequency? Why?

>A good article that explains it
>can also help.

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