piclist 2002\10\31\070356a >
Thread: Son of simple step-up SMPS challenge
face BY : Russell McMahon email (remove spam text)

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Self oscillating 4 transistor boost converter.

Haven't looked at it in detail but looks promising.
Arguably pushing upper complexity limit in most cases compared with IC



They say

In this small switching power supply, a Schmitt trigger oscillator is used
to drive a switching transistor that supplies current to a small inductor.
Energy is stored in the inductor while the transistor is on, and released
into the load circuit when the transistor switches off. The output voltage
is dependent on the load resistance and is limited by a zener diode that
stops the oscillator when the voltage reaches about 14 volts. Higher or
lower voltages can be obtained by adjusting the voltage divider that feeds
the zener diode. The efficiency is about 80% using a high Q inductor.

       Russell McMahon

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