High-voltage, high-side floating current sensing circuit using current output, current sense amp




This cookbook is intended to demonstrate a method of designing an accurate current sensing solution for systems with high common mode voltages. The principle aspect of this design uses a unidirectional circuit to monitor a system with Vcm = 400V by floating the supplies of the device across a Zener diode from the supply bus (Vcm). This cookbook is based on the TIDA-00332 high voltage 12 V – 400 V DC current sense reference design.
  • Input: -40 A to 40 A
  • Output: 100 mV to 4.9 V
  • Supply: Vs = 5 V, GND = 0 V, Vref = 2.5 V
  • Standoff and clamp voltages: Vwm = 36 V, Vc = 80 V
  • EFT level: Vpp = 2 kV 8/20 µs

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Design tool

Source Files for SBOA295 (Rev. A) SGLC001A.ZIP (28KB)

Release date: 14-Jun-2018
Supported products & hardware

Supported products & hardware

Current sense amplifiers analog output
INA138 2.7 to 36V, 800kHz Variable gain current sense amplifier INA168 2.7 to 60V, 800kHz Variable gain current sense amplifier

Technical documentation

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Type Title Date
* Application note High-voltage, high-side floating current sensing circuit using current output, c Jun. 28, 2018
* Application note Extending Voltage Range of Current Shunt Monitor Feb. 15, 2006
Application note Using An Op Amp for High-Side Current Sensing (Rev. A) Dec. 07, 2021
Selection guide Current Sense Amplifiers (Rev. E) Sep. 20, 2021
E-book Simplifying Current Sensing (Rev. A) Jan. 09, 2020

Related design resources

Design tools & simulation

PSPICE-FOR-TI PSpice® for TI design and simulation tool TINA-TI SPICE-based analog simulation program
ANALOG-ENGINEER-CALC Analog engineer's calculator

Reference designs

TIDA-00332 High Voltage 12 V – 400 V DC Current Sense Reference Design

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