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ucc28019不能带载问题

Other Parts Discussed in Thread: UCC28019

请教专家,就是我用UCC28019做功率因数校正,输入15V交流,芯片供电用的直流电源15V,基本上是按照datasheet上焊的,

只是现在上电之后不带负载时输出电压可调,8脚输出的驱动波形很烂,时有时无的,但是至少输出电压可调。

带上负载后,8脚的波形就没有了,而且输出电压也不可调。

请大家帮我看看这个是怎么回事