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UC3846: Duty cycle of UC3846

Part Number: UC3846

I am testing UC3846 duty cycle at output with rotating potentiometer (by varying voltage) at EA pin EA(-). My maximum duty cycle is 38%. I am getting gradual change from 10% to 26% in duty cycle by rotating potentiometer at EA(-) pin. But after 26% it jumps to 38% directly. I changed the potentiometers & its values but the result is the same. Where is the mistake? Please help.

Thanks.

-Satyavijay