On 03-Mar-12 10:06, RussellMc wrote:


>
> An MC34063 can drive almost any topology (boost, buck, boost-buck,
> Cuk, SEPIC, flyback, ...) , has a usefully capable internal switch ,
> good voltage rating, and high side current sense. It lacks the various
> soft starts and lockouts and more of many modern IC but you can do
> most things with it with not too much effort at a fraction of the cost
> of much more modern ICs. 100 kHz max is annoying. Darlington switch
> makes efficincy poor at lower voltages. Update it and it would be
> suitable for many more tasks than it is already.
>
>
>
>       Russell McMahon
>

     A similar (and perhaps better) one is the NCP3063 or the NCP3064.

     Mark Jordan

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