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UCC28950 Problem of Duty ratio:

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abhinand rd

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Hello,

I am having problems testing UCC28950 IC.
I am testing this IC's functionalities without the true signals from the power circuit.
the problem is i am not able to vary the duty cycle of the PWM outputs by varying the feedback pin voltage.
More closely, i am not able to obtain Error amplifier output(COMP) when the feedback signal(EA-) is varied.
I need some help/inputs on this.. Pls ask if any more details are required
Thanks
 

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