DC-DC step down converter design

elmurry · 14th February 2012, 07:29 PM

I would like to design my own inductor for my buck converter using the toroidal inductor from a damaged PC power supply but I dont know whether the wounded wire is capable to hold 25A current or not. And If it is not, what is the suitable gauge of enameled wire? and does the the core of the power supply is suitable for 50 KHz frequency?

Your help will be greatly appreciated

elmurry

CBS240 · 14th February 2012, 10:22 PM

Check a wire chart. Use multiple strands.

sawreyrw · 14th February 2012, 11:20 PM

I hate questions like this. You need to know the characteristics of the core and how to design inductors. If you don't know this, you're out of luck.

! · 15th February 2012, 06:55 PM

Look at the PSU's label, the power rail that inductor was in will have a current rating. They'd probably (unless it was a poor quality cheap product) use inductors rated for a bit more than the current spec'd but not a lot more, there's cost and the PCB real estate left is better used for capacitors.

14th February 2012, 07:29 PM	#1
elmurry diyAudio Member Join Date: Feb 2012	DC-DC step down converter design I would like to design my own inductor for my buck converter using the toroidal inductor from a damaged PC power supply but I dont know whether the wounded wire is capable to hold 25A current or not. And If it is not, what is the suitable gauge of enameled wire? and does the the core of the power supply is suitable for 50 KHz frequency? Your help will be greatly appreciated elmurry

14th February 2012, 10:22 PM	#2
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	Check a wire chart. Use multiple strands. __________________ All the trouble I've ever been in started out as fun......

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14th February 2012, 11:20 PM	#3
sawreyrw diyAudio Member Join Date: Apr 2006 Location: Minnesota	I hate questions like this. You need to know the characteristics of the core and how to design inductors. If you don't know this, you're out of luck.

15th February 2012, 06:55 PM	#4
! diyAudio Member Join Date: Jun 2005 Location: Midwest	Look at the PSU's label, the power rail that inductor was in will have a current rating. They'd probably (unless it was a poor quality cheap product) use inductors rated for a bit more than the current spec'd but not a lot more, there's cost and the PCB real estate left is better used for capacitors.