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UC3842: Open loop test

Part Number: UC3842
Other Parts Discussed in Thread: UC3844,

Hi

How can we check the open loop test of uc3842/uc3844?

I gave

Vcc = 17V,

Vfeedback = 2.5V externally

Isense = 0.5V externally

When applying all these voltages, the output pulse I'm getting has max pulse width(for uc3842 - 98% & for uc3844 - 48%). By varying Vsense and Isense pulse width is not varying. Why pulse width is not varying by changing these voltages?