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The first channel is input ac voltage: Scale : 100V/div

The second channel is Vcc voltage: Scale : 5V/div.

When I give supply 16V supply to the IC externally. It starts generating the sawtooth output and gate output at near maximum duty.

However, when AC voltage is given, the Vcc voltage swings between 15.5 and 10 V. How to know if its due to ULVO.

The sense resistor is kept at 0.15Ohms.