Buck and boost with any pic

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be80be

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I been play round with small delay and a small 220uH coil the coil rated at 500ma .

If you set a delay of like 6 to 10 uS you get a boost of almost 4 times Vdd

And you can very the delay to lower the boost here a little circuit to play with you can use the timer if you want.

I been using it for power for the LCD with 3.3 volt chips works fine

Here a link if you want to no more about the how to figure parts a detailed guide to building your own DC/DC converter using a little PIC, by Olin Lathrop

If you read the link it tells how to get maxim efficiency and how to figure all the parts needed
 

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Burt, you have to very careful with this circuit. Unlike using a true SMPS controller IC, there is nothing in this circuit which limits the current through the inductor to the optimum level for the power transfer to the load, so the efficiency will be poor, and if you make the pulse width too wide, you can saturate the inductor, and/or blow up the transistor.
 
I have a 20 ohm 1.25 Watts resistor to limit power in that should keep it at a safe range.

But your right you can saturate the inductor by using to long a delay

If you read the link it tells how to get maxim efficiency and how to figure all the parts needed

MikeMl Thanks for added info

Here to show how this works
 

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He using it to lower the voltage I'm boosting it from 3.3 volts up to what you need

But it's a nice read thanks RMMM
 
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I was thinking about using for EL back lighting It would be nice if the 10f200 had ADC
 
Feedback you could control voltage output Like this It just a example not working model
 

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Buck boost buy parts LOL I like Newark They have fast shipping and the rates are good
 
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