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From: Spehro Pefhany
Subject: Re: Constant Current Sw Regulation?
X-Newsreader: Forte Agent 1.92/32.572
Date: Tue, 19 Nov 2002 20:06:30 GMT
NNTP-Posting-Date: Tue, 19 Nov 2002 15:06:30 EST
On Tue, 19 Nov 2002 18:05:35 GMT, the renowned "Roger N"
>On the battery charger I'm working on, it needs to be able to charge from
>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 1.05A.
>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!
Do a search on "Hysteretic buck converter" for more info. You might
want to avoid using an op-amp rather than a comparator for this kind
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