Single-supply circuit measures -48V high-side current

Focus:

Circuit uses difference amplifier and op amp to measure negative currents ranging from -48 V to -60 V, yet operates from a single, positive supply rail.

What you’ll learn:

• How to measure negative high-side currents using a circuit powered by a positive supply rail
• How to avoid the need for dual, positive and negative supplies when measuring -48-V high-side currents

Notes:

An EDN Design Idea

View the Source

Author & Publication:

Wenshuai Liao, Analog Devices, Beijing, China, Stephen Lee, Analog Devices, Wilmington, MA, and Yanhui Zhao, Beihang University, Beijing, China; Edited by Charles H Small and Fran Granville, EDN, Feb 21 2008

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