I don't know, but this one may help, it's the complete one I know:
http://www.thierry-lequeu.fr/data/AN920m.pdf

On Fri, Jul 3, 2015 at 1:55 AM, Bob Blick <bobblick@ftml.net> wrote:

> I think you're right, it's running about 75KHz. When I looked at it
> running on a scope I think it did a cycle in under 20us, so it's faster
> than 50KHz. It's got a 330pF timing cap on it.
>
> Thanks, Bob
>
> On Thu, Jul 2, 2015, at 04:33 PM, Mr Smiley wrote:
> > It's only rated to 100khz
> >
> >
> > On 02/07/15 19:27, Bob Blick wrote:
> > > Hi Sean,
> > > It's running somewhere around 150-200KHz. FM interference is what I
> care
> > > about. I have reduced it somewhat by wrapping the device in foil and
> > > putting a couple of clamp on ferrites on the output line. But the inp=
ut
> > > is not filtered and that has more ripple. So I'd need to put the guts
> in
> > > a separate enclosure to filter the input.
>
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