Tom Bruhns is a design engineer with Agilent Technologies, Everett, Wash. He holds a PhD and an MS in electrical engineering from the University of Arizona, Tucson, and an MS and BS from the University of Wisconsin, Madison, and the University of Washington, Seattle, respectively. Email address: tom.bruhns@agilent.com
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November 17, 2008[Ideas For Design] Using Copper Traces As Ballast Resistors Ensures Balance
The data sheet for the LT3080 linear voltage regulator suggests using printed-circuit-board (PCB) traces for ballast resistors. Although the LT3080’s low offset voltage suits it well for this technique, it can be used for other ballast applications— for instance, for a set of bipolar transistors. For example, in the figure, ballast resistors R1 and R2 can be short lengths of copper trace. In a practical case,...
