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CIRCUIT060030

High-side, bidirectional current-sensing circuit with transient protection

CIRCUIT060030

Overview

This high-side, bidirectional current sensing solution can accurately measure current in the range of –40 A to 40 A for a 36-V voltage bus. The linear voltage output is 100 mV to 4.90 V. This solution is also designed to survive IEC61000-4-4 level 4 EFT stress (Voc = 2 kV; Isc = 40 A; 8/20 µs).
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
INA193 — -16 to 80V, 500kHz current sense amplifier INA240 — -4 to 80V, bidirectional, ultra-precise current sense amplifier with enhanced PWM rejection
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Technical documentation

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Type Title Date
* Circuit design High-Side, Bidirectional Current-Sensing Circuit with Transient Protection (Rev. A) PDF | HTML 01 Feb 2019
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
Application note Evaluating Current Sensing Amplifiers in Body Control Modules Using Simulation 16 Dec 2019

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