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UCC2808A-2: UCC2808A-2 error amplifier open loop gain test

Part Number: UCC2808A-2


My problem is ucc2808a2's error amplifier open loop gain test.  Somewhere between  0.35 and 1.2 volts on the COMP pin. you will start to get pulses. at the comp voltage increases the pulse widths will get larger. Beacuse of the pulse,I can't test the  error amplifier open loop gain.

How can I test the gain?