Buck Converter

372

11:10:25

Can someone guide me how to design the component's parameter?

published 5 years ago

PrathikP

5 years ago

Now I donno how to use math to solve for the value of L and C, but you can kind of use a general rule of thumb/ trial-and-error to find the component values. Typical switching frequency is 10KHz-1MHz. I usually pic 100kHz for my designs. For such a frequency and atleast 5V voltage different between output and input, you can use 10-33uH inductance and 100-330uF capacitance and you can draw sufficiently decent amount of current for an acceptable output ripple.

PrathikP

5 years ago

Now for such circuits, don't use a logic source. Also, using an NMOS for high-side switching (it's what you're doing, basically) requires bootstrapping.

PrathikP

5 years ago

https://everycircuit.com/circuit/6267028191838208

PrathikP

5 years ago

And here is a more refined one https://everycircuit.com/circuit/6549804275204096

MatthewKessler

5 years ago

What waveform has it got to be? I experiment with the components, and I tried 5H, 1uF.

BillyT

5 years ago

@Matthew, 5H is a bit large keep to the mH - uH area, and if you want any current out, the capacitor needs to be in the range of 100 to 470 uF.

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