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CIRCUIT060032

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

CIRCUIT060032

Overview

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.
Features
  • 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
Analog current-sense amplifiers
INA138 — 2.7 to 36V, 800kHz Variable gain current sense amplifier INA168 — 2.7 to 60V, 800kHz Variable gain current sense amplifier
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Technical documentation

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Type Title Date
* Application note Extending the Common-Mode Voltage Range of Current-Output Current Shunt Monitors (Rev. A) PDF | HTML 21 Mar 2022
* Circuit design High-voltage, high-side floating current sensing circuit using current output, c 28 Jun 2018
E-book An Engineer's Guide to Current Sensing (Rev. B) 12 Apr 2022
Application brief Using An Op Amp for High-Side Current Sensing (Rev. A) PDF | HTML 07 Dec 2021
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021

Related design resources

Design tools & simulation

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

Reference designs

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

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