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Electronics Sandbox

a place to share ideas

Bootstrap supplies

I've been dabbleing in the SMPS arena, and might need some low power high voltage bootstrap supplies for a project. I'm thinking of baseing them on Roman Black's very minimalistic converter: http://www.romanblack.com/smps/smps.htm Which is based on Richard Ottosen's SMPS.

Now my friend Gary says I should just get an dev kit like the SLUU068C for $100 and add beefy power blocks to it.

Here is my version of the 12V Black converter: black_12v_clean.png And the NGspice simulation: black_12v_gaw.png The turn on / off times are about 250 - 350ns.Compare the green trace with Roman's: cro.jpg

Clif, your circuit seems to alternate long and short cycles somehow, the trace does not look like Roman's.Yes Robert, it's called PWM and for the load it has on it which is somewhat different than Roman's example, this is the pattern it uses to regulate the voltage. It's caused by the fixed off time and that it falls a little bit behind on the short cycle but makes up for it on the long one. If I turned up the current draw I think they would even out.

Notes:

Links:

Small DC-DC modules:

Chip level controlers

-- ClifCox - 2010-11-16
Topic attachments
I Attachment Action Size Date Who Comment
black_12v_clean.pngpng black_12v_clean.png manage 29.6 K 16 Nov 2010 - 23:28 ClifCox My 12V Black converter
black_12v_gaw.pngpng black_12v_gaw.png manage 44.2 K 16 Nov 2010 - 22:59 ClifCox NGspice simulation of the 12v converter
sluu068c-1.pdfpdf sluu068c-1.pdf manage 107.8 K 16 Nov 2010 - 20:48 ClifCox SLUU068C? data sheet
tdc_hpr1xxc.pdfpdf tdc_hpr1xxc.pdf manage 106.1 K 16 Nov 2010 - 21:07 ClifCox Small DC-DC modules
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Topic revision: r7 - 13 Jan 2011 - 17:56:32 - ClifCox
 

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