 From: schaerer@isi.ethz.ch (Thomas Schaerer) Subject: Re: Voltage regulation and current limiting Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH X-Newsreader: TIN [version 1.1 PL9] Lines: 21 Andy Collins (acollins@uclink.berkeley.edu) wrote: : One not-so-quick question to throw out there for you guys... : For our class project, we need to design and build a power supply : to the following specs: : Voltatge: adjustable from 1-12V : Current: *limited* at 1A : Voltage must stay within 2% of designated value for I from 0-1A : AC ripple less than 5 mV (rms) To decide which kind of circuit you must know the initialprecission of the limiter-current and the allowed temp-drift. In the first case, you can use a Ube of a transistor as a voltage-reference of about 0.7 VDC with a temp-drift of 2mV/K. In the second case its better you use a bandgap-ref and a opamp-circuit to detect the maximum-current. The output of this opamp controlls the outputstage to limit the current. Bye Thomas`

