0 to 100V digitally controlled supply


2010-09-17 7:20 am

Currently I have a 0 to 100V, 100mA power supply circuit build using the TL783, but the control the output voltage control is made with a potentiometer. Now I want to control this output voltage using a micro-controller. I thought of using a digital potentiometer to control it, but the system is not very stable. Basically I used a the digital potentiometer to control a OP-Amp to control the current of the adj pin, but is not working very well. Anyways using a regulator causes to much power loss, so its not good.
What I hope you can help me with is how to make a better controller, not necessarily using a voltage regulator, but maybe a PWM control for a switching supply to have a better result.

Thanks for any help