This circuit's operation is governed by the equation 1. The maximum current drawn from the local V+ supply is only 1/80th of max I_OUT, translating to an 80:1 efficiency gain. Asterisked resistors are 0.5% precision or better

Authors	Stephen Woodward
Main Document	Article «4-20mA to 0-20mA converter sips mere microamps»
Description	Figure 1
File Format / Size	PDF / 17 Kb
Document Language	English

Slices

This circuit's operation is governed by the equation 1. The maximum current drawn from the local V+ supply is only 1/80th of max IOUT, translating to an 80:1 efficiency gain. Asterisked resistors are 0.5% precision or better