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Subject: Re: Current limiting design

Date: 06/17/03 at 10:07 AM
Posted by: David Stephens
E-mail: dstephens@inventgineering.com
Message Posted:

In Reply to: Re: Current limiting design posted by Russ Kincaid on 06/13/03 at 8:08 AM:

The biggest problem I see in your suggestion is the power dissipation of the variable resistor. I am assuming you are suggesting a voltage reference on the base. It would probably be better to use a variable voltage and a fixed high power resistor on the emitter but you may have problems in the application and/or with power dissipation in the transistor if the voltage drop is too high. There are some power FET devices with current sense on the market that might be better when used with a reference and control circuit. If the voltage drop in the application is high, look at using a switching circuit to reduce the heat dissipation.


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