variable high voltage dc power supply using lnk306
I have designed 554V dc power supply by referring to the document DI-210. Please tell me how to make output variable from 100V to 500V. I tried using potentiometer in the feedback circuit in divider so as to vary the voltage but i'm not getting line regulation below output voltage 350V. Please tell me the changes in the circuit and also why so?
Comments
Hey everyone thank you for your help my circuit started working.
@Wesley: i'm trying for buck boost. Could you suggest me any reference design for buck boost so that i can modify my circuit?
hey please tell me rough equations for inductor design and also for the transformers used in flyback and forward topology circuits
PI Xls has a LNK-TN Buck-boost design spreadsheet. This is the best way to design using this product and the desired topology.
-Wesley
If your input voltage is above your output voltage you cannot use a boost topology as used in DI-210. This is because a boost topology's ideal transfer function is Vout = Vin/(1-D) which means that if your duty cycle approaches 0 your output will only ever become Vout.
You will have to use a Buck/Boost topolgy to get an output voltage that is both above and below your input voltage.
-Wesley