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---+ Electronics Sandbox

a place to share ideas
%TOC%
---++ 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 [[http://www.idcomm.com/personal/ottosen][Richard Ottosen's]] [[http://www.romanblack.com/smps/smps_ric.gif][SMPS]].

Now my friend Gary says I should just get an dev kit like the [[%ATTACHURL%/sluu068c-1.pdf][SLUU068C]] for $100 and add beefy power blocks to it.

Here is my version of the 12V Black converter: [[%ATTACHURL%/black_12v_clean.png]] And the NGspice simulation: [[%ATTACHURLPATH%/black_12v_gaw.png]] The turn on / off times are about 250 - 350ns.Compare the green trace with Roman's: http://www.romanblack.com/smps/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:
   * GarysStuff
   * CodeModels
---+++ Links:

Small DC-DC modules:
   * [[%ATTACHURL%/tdc_hpr1xxc.pdf][TDC_HPR1xxC]]

Chip level controlers
   * http://www.powerint.com/

-- Main.ClifCox - 2010-11-16

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

Topic revision: r9 - 13 Jan 2011 - 20:44:04 - ClifCox

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