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LM5088MHX-1 -low output voltage

Hi,

This regulator has been designed to get an output voltage of 18V,500mA.Input voltage given is 24V.

But the output voltage obtained is 4.93V.HG pin duty cycle designed is 44.5% and obatained is 7.44%.

Could you please suggest a solution asap?

Below shown is the schematics 

Below shown is the Output voltage(yellow),HG pin output(green)