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UCC2897A: UCC2897A NO output

Part Number: UCC2897A

I now use the UCC2897A, but now no PWM output, VOUT no voltage
However, the UCC2897A VDD voltage to meet the requirements of the actual test is 11.5V
In addition, the actual test FB voltage is 5V, SS / SD voltage is 1.6V



TI have relevant experience for reference