UC3825B: How to Disable the PWM IC - during Under Voltage and Over Voltage Condition

Part Number:UC3825B

I have designed Opamp based UVLO/ OVLO Circuitry with 20V Hystersis , which generates 5V Output Signal during undervolatge and Overvolatge, How to use this signal to disable the operation of UC3825B PWM  IC ?

Thanks,