On Mon, May 25, 2009 at 6:01 AM, Jinx wrote: > > It is very difficult to beat MC34063 (or similar) in price. So you > > can still use it and just add an external PNP transistor to boost the > > output current > > The 3063 datasheet shows examples using FETs, which are not used > in the 34063 datasheet > > http://www.onsemi.com/pub/Collateral/NCP3063-D.PDF > > The increase from 50kHz (34063) to up to 250kHz (3063) means > cost savings on the inductor too > > I use the 34063 in various configurations and would change to the > 3063 in circuit revisions > It looks like a nice part. It is significantly more expensive than the 23 cent MC34063 at 40 cents though. Like you said, it depends on if you can save the money on the inductor and filter cap. - Martin -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist