CIRCUIT060037

Precision over-current latch circuit

CIRCUIT060037

Overview

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.
Features
  • 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
Comparators
TLV4041 Low-power comparator with reference (non-inverting, push-pull)
Current sense amplifiers analog output
INA185 26V, 350kHz, bi-directional, high-precision current sense amplifier in ultra small (sot-563) package

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Technical documentation

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Type Title Date
* Application note Precision overcurrent latch circuits May 29, 2019
Selection guide Current Sense Amplifiers (Rev. E) Sep. 20, 2021
E-book Simplifying Current Sensing (Rev. A) Jan. 09, 2020

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