Fast-response overcurrent event detection circuit



This is a fast-response unidirectional current-sensing solution, generally referred to as overcurrent protection (OCP), that can provide a < 2-μs time response, tresp, overcurrent alert signal to power off a system exceeding a threshold current. In this particular setup, the normal operating load is from 80 mA to 900 mA, with the overcurrent threshold defined at 1 A (IOC_TH). The current shunt monitor is powered from a 5-V supply rail. OCP can be applied to both high-side and low-side topologies. The solution presented in this circuit is a high-side implementation. This circuit is useful in smart speakers and docking stations.
  • Input: Iload = 80 mA to 900 mA
  • Overcurrent conditions:
    • Ioc_th = 1 A
    • t_resp = < 2 μs
  • Output:
    • Vout_oc = 1.2 V
    • Vout_release = 1.18 V
  • Supply:
    • Vs = 5 V
    • Vref = 0 V
Analog current-sense amplifiers
INA180 26V, 350kHz current sense amplifier INA181 26-V bi-directional 350-kHz current-sense amplifier INA185 26-V, 350-kHz, bi-directional, high-precision current sense amplifier in ultra-small SOT-563 package
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Type Title Date
* Circuit design Fast-response overcurrent event detection circuit 27 May 2019
E-book An Engineer's Guide to Current Sensing (Rev. B) 12 Apr 2022
Selection guide Current Sense Amplifiers (Rev. E) 20 Sep 2021
E-book Simplifying Current Sensing (Rev. A) 09 Jan 2020
Circuit design Overcurrent event detection circuit 31 Jul 2018

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