Overcurrent event detection circuit



This is a unidirectional current sensing solution generally referred to as overcurrent protection (OCP) that can provide an overcurrent alert signal to shut off a system for a threshold current and re-engage the system once the output drops below a desired voltage (Vout_release) lower than the overcurrent output threshold voltage (Vout_OC). In this particular setup, the sensing range is from 1.5 A to 40 A, with the overcurrent threshold defined at 35 A (IOC_TH). The system re-asserts the ALERT to high once the current has dropped below 32 A (IRelease_TH). The current shunt monitor is powered from a 3.3-V supply rail. OCP can be applied to both high-side and low-side topologies. The solution presented in this article is a high-side implementation.
  • Input: 1.5 A to 40 A
  • Overcurrent conditions:
    • Ioc_th = 35 A
    • Irelease_th = 32 A
  • Output:
    • Vout_oc = 2.8 V
    • Vout_release = 2.61 V
  • Supply:
    • Vs = 3.3 V
    • Vref = 2.8 V
Current sense amplifiers analog output
INA301 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator INA302 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ dual comparators INA303 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ window comparator INA381 26-V, 350-kHz current sense amplifier with integrated over-current comparator

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Type Title Date
* Circuit design Overcurrent event detection circuit Jul. 31, 2018
More literature Over-Current Detection Products Brochure Aug. 14, 2014

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