CIRCUIT060079

Overvoltage protection with comparator circuit

CIRCUIT060079

Overview

This overvoltage protection circuit uses a high-voltage comparator with a push-pull output stage to control a P-Channel MOSFET that connects the SUPPLY to the LOAD. When the SUPPLY voltage exceeds the overvoltage threshold (VOVER), the output of the comparator goes HIGH and disconnects the LOAD from the SUPPLY by opening the P-Channel MOSFET. Likewise, when the SUPPLY voltage is below VOVER, the output of the comparator is LOW and connects the LOAD to the SUPPLY.
Features
  • Supply: operating voltage range = 12 V to 36 V
  • Load: maximum operating voltage = 30 V
  • Comparator output status (OUT)
  • SUPPLY < V_over
  • V_cl < 0.4 V
  • SUPPLY ≥ V_over
  • V_OH = SUPPLY
Comparators
TLC3702 Dual, Micropower, Push-Pull Outputs, LinCMOS™ Voltage Comparator TLV1805 High voltage comparator with push-pull output and shutdown TLV3701 Single Nanopower High-Voltage Comparator

Technical documentation

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Type Title Date
* Application note Overvoltage protection with comparator circuit Jan. 17, 2019

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