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UCC2897A调试问题

weimin xue
Intellectual 350 points
Other Parts Discussed in Thread: UCC2897A

16V-45V输入，5V输出有源钳位正激变换器，采用UCC2897A做主控芯片，调试过程问题如下：原边变压器未连入电路时，芯片工作正常，主管和辅管驱动正常；将变压器连入后，无驱动输出，SS/SD引脚为2.5V峰值三角波，LineOV及LineUV引脚电平符合正常工作要求，FB引脚5V（开环），想请教问题出在何处？