LM317 Current-Expansion Circuit (2)

Published:2011/7/16 6:29:00 Author:Robert | Keyword: Current, Expansion | From:SeekIC

The picture shows the LM317 current-expansion circuit (2). This circuit is also OK. But its output voltage may be unstable. Because the LM317's pin 1-2 is the reference voltage and the output voltage would minus the power transistor's B-E junction voltage. Not only this, the B-E junction voltage also would decrease while the transistor's temperature increasing. So the output voltage mey be unstable and it's not recommended to do this.



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