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Subject: Re: Constant Current Sw Regulation?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Tue, 19 Nov 2002 18:55:45 GMT
NNTP-Posting-Date: Tue, 19 Nov 2002 19:55:45 MET
Roger N wrote:
> On the battery charger I'm working on, it needs to be able to charge
> 1.2V to ~20V. I prefer to use a switching regulator for efficiency.
> A description I read for a chopper stepper motor drive explained that
> they turn the switch on when the current is lower then the desired
> current and turn the switch off when it is above the desired current.
> Would it work to use an op-amp circuit with hysteresis and a current
> sensing resistor to switch the transistor of a basic buck converter?
> For example, for 1A regulation, switch on at 0.95A and back off at
> This sounds simple enough and the switching frequency could vary
> depending on the inductor and load. Just wondering if there was any
> reason not to do it this way? Thanks!
Maybe a comparator with built-in hysteresis, an adjustable reference
voltage, current sense resistor in gnd line. PFET switch
electronic hardware designer
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