Alan B. Pearce wrote:
>> I have noticed that the National Semi 50Khz "Simple Switchers"
>> seem to generate less EMI than the higher frequency ones.
>> Just a place to start.
>>     
>
> Well, that is a rule of thumb for switchers, lower the frequency, lower the
> EMC, but the cost is larger inductors.
>   
Sometimes, larger caps, too.
> Another device you may like to look at is Linear Technology LT1777 which is
> a 100kHz device, but allows you to program the dI/dt to minimise noise, and
> has internally limited dV/dt.
>
>   
Thanks for the heads up.

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist