Hello,
  I'm trying to find a solution for a power supply. It will supply power to
an appliance, so it should be as inexpensive as possible. It will also have
to be as small as possible since the design department says I have no more
room to play with :)

  The requirements are:

Vout1: 100Vdc 3A continuous and 10A peak (<5sec) to drive a DC motor
(unregulated)

Vout2: 12~15V 15mA continuous to drive some mosfets

Vout3: 5V 15mA for a PIC


Ideally, it will be for 100~240 Vac input voltage, preferably but not
mandatory with automatic voltage selection.

A transformer is not viable, since there is no room for it.

The current design is very bad (not mine :P). It consists of a high power
series resistor that feeds a rectifier. The output of the rectifier has a
high ripple DC and then there are two zenners, the first one 15V and the
second 5V. It works (kind of) but I wish to:

a) reduce the ripple to 10% aprox (at Vout1)
b) improve the design to eliminate the resistor.

Regards,

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