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LM5575-Q1: Ramp resistor

Part Number: LM5575-Q1

Hello,

As datasheet recommends , Resistor between VCC to Ramp, above Vout 7.5V.

as our DC_DC  Vout is 15V,  I have connected 68.1K resistor.

At, 1.5A load, I have observed, voltage dip to 3.4V at Vin 24V to 30V. for you reference find the attached Oscilloscope plots with and without R ramp.

With R ramp resistor : Voltage dip is 3.4V

I wanted to understand, what is reason for the dipping the voltage?

is it necessary  to add the R ramp resistor?

Thank you,