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MC33063A: MC33063A application issue check

Part Number: MC33063A

Hi Team,

My customer is using MC33063A in their project. They want to use the pin 5 of MC33063A as the enable/disable PWM pin, but they found sometimes they can't disable the PWM. So can you help check why? Below is the internal block diagram of MC33063A.

Customer's schematic showed as below:

So if we don't suggest customer use PIN 5 to disable PWM, do we have another solution to realize this requirement? Thanks! for your support

Best regards,

Sulyn