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



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).
  • 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
Current sense amplifiers analog output
INA193 -16 to 80V, 500kHz current sense amplifier INA240 -4 to 80V, bidirectional, ultra-precise current sense amplifier with enhanced PWM rejection

Technical documentation

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Type Title Date
* Application note High-side, bidirectional current-sensing circuit with transient protection (Rev. A) Feb. 19, 2019
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
Application note Evaluating Current Sensing Amplifiers in Body Control Modules Using Simulation Dec. 16, 2019

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