piclist 2008\07\18\212828a >
Thread: Power supply project
www.piclist.com/techref/power/actodc.htm?key=power
face picon face BY : Jinx email (remove spam text)



> Could you not just add a zener in the feedback leg of the SMPS
> so it always tries to output Vzener volts above the voltage you have
> dialed?

Hmmm, so it's tracking but somewhat higher than the required output

I'll look into that. The feedback divider reduces the output voltage
to that of the controller's internal reference, and the controller
switching works to maintain the output voltage by comparing that
feedback voltage to the reference

Possibly a TL431 adjustable Zener might be used ? If voltage setting
is to be done in the linear stage then that information has to go back
into the SMPS section for tracking. Perhaps

Time to open up some app notes ......

<018701c8e93e$88268890$89aafea9@ivp1> 7bit

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