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Subject: Re: foldback current-limiting
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Date: 12/02/01 at 6:15 PM
Posted by: Brian Snell
In Reply to: foldback current-limiting posted by Francis LHeureux on 11/06/01 at 2:46 PM:
I think that an LM317 voltage regulator, configured as a constant-current source set for 1A may serve your purposes. The chip is good for 1.6A (with heatsink) and the constant-current mode will limit the current to the set limit. Standby operation would be set by holding the normally "Adj" terminal at "-ve" which would pull the output line down to 1.2 volts. Opening the "adj" link allows the chip to track normal constant-current operation with output voltage being input less the regulator drop. If the residual 1.2v is bothersome during "standby" add 2 silicon diodes in series with the regulator output before feeding the load.
Hope that this helps.
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