Bob Axtell wrote:
> Olin has a slick design using PIC10Fxxx that performs switched
> regulation... oops that is SMT, methinks.

I've used 10Fs a lot as simple switching power supply controllers, and there
is a good chance I'll be teaching a course on this subject at Masters this
summer.  A 10F204 is generally cheaper than a dedicated analog chip, and you
get other useful features that are either missing or don't work the way you
want on dedicated chips.  These include startup delay, special voltage
startup handling, guaranteed min/max switching element on time, and power
good output.

A basic example is in the buck regulator of the QuickProto-01,
http://www.embedinc.com/products/qprot01.

Yes, this circuit is SMT because that's a no-brainer today.  It takes less
space, the parts are more available, and it costs less to populate the
boards.  The only remaining purposes for thru hole are for mechanical
strength and for prototyping where the expense and board space of a socketed
DIP IC is worth the flexibility, for example.


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