Precision over-current latch circuit



This high-side, current sensing solution uses a current sense amplifier, a comparator with an integrated reference and a P-channel MOSFET to create an over-current latch circuit. When a load current greater than 200 mA is detected, the circuit disconnects the system from its power source. The comparator output will latch (hold the gate source voltage of the P-channel MOSFET to 0 V) until power to the circuit is cycled, since the comparator drives the gate of the P-channel MOSFET and feeds the signal back into the reference pin of the current sense amplifier.
  • Load current Ioc = 200 mA
  • System supply typical: Vs = 24 V
  • Current sense amp: gain = 20 V/V
  • Comparator output status: over current: Voh = Vs
  • Normal operation: Vol = Vs - 5 V
TLV4041 Low-power comparator with reference (non-inverting, push-pull)
Analog current-sense amplifiers
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 Precision overcurrent latch circuits 29 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

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