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Using a Step-down switching regulator, how can I convert 12v to 3.3v ?

Question asked by piro in #Coffee Room on Nov 7, 2009
piro
piro · Nov 7, 2009
Rank E2 - BEGINNER
Hello, I am working on a project. And part of it concerns the switching regulator.

I am using the MC34063 from OnSemiconductors.

I plan to use it as a step down converter, 12v to 3.3v with a 200mA output current, so I can power up a microcontroller and other IC's but I have a hard time finding out some of the component values...

I tried using the calculator from the following website MC34063A design tool,but there are certain values such as the voltage ripple and Minimun frequencies which confuse me a little bit.

I am using the following schematic design (this can be seen in their datasheet under stepdown converter)

MC34063 datasheet, MC34063 datasheets, MC34063 datenblatt, MC34063 manual, MC34063 data sheets, MC34063 pdf - ALLDATASHEET.COM

I tried adding different values which I calculated from the given formulas in the datasheet and even tried using the calculator, but when I simulated these, it did not work...😳


If it helps anyone, I am using the Pic24fj256ga110 from microchip ( the switching regulator will be connected to this u-controller).

PIC24FJ256GA110

Thank you in advance for any advice and help.😛 Posted in: #Coffee Room

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