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buck boost converter

buck boost converter

buck boost converter

(OP)
i am trying to design a buck boost converter to output a controled 12 volts dc with a variable voltage input of 8-16V dc, i am having a hard time controling the voltage output, if anyone has a circuit like this or has any helpful suggestions please let me know.

RE: buck boost converter

Please describe more fully what you mean by "having a hard time controlling the output voltage".  Is it anywhere close to 12V?  Does it start close and wander off?  What do you mean?

RE: buck boost converter

All significant dcdc-ic manufacturers publish circuits for this "problem": SEPIC-circuits are one of the easiest solutions. Look at www.maxim-ic.com, they are specialists for those ICs.
If the output voltage must be very stable (better than 1%), you should combine a reference and a low offset OPA to feed back the (divided) output voltage signal to the error amp pin of the dcdc-ic. This second control loop shoud be at least 5 times slower than the initial circuit (often a current controlled PWM) to maintain stability.
If you have more detailed questions, let me know.

tiki

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