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What's wrong with this circuit?
What's wrong with this circuit?
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Old 8th July 2012, 08:33 PM   #21
cbdb is offline cbdb  Canada
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Join Date: Oct 2008
Location: Vancouver
Its basically an adjustable zener. for basic operation replace the circuit with R1 and a zener with the value of vref. So power dissapation in the chip is Iin* vref, where Iin (with no load) is Vin-vref/R1 (the current thru R1). If theres a load you subtract the load dissapation (vref^2/Rload) from the previous result.
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Old 8th July 2012, 09:39 PM   #22
Redshift187 is offline Redshift187  Canada
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Join Date: Aug 2008
Okay, that's a more precise way of looking at it, and answers my second question. What I also wanted to know was whether to subtract Iload from the 431 dissipation.

Last edited by Redshift187; 8th July 2012 at 09:44 PM.
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