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请问用UCC28019做的PFC没驱动能力可能原因

Other Parts Discussed in Thread: UCC28019

用UCC28019做的PFC没驱动能力,

输入交流有效值16V,输出36V,空载时OK,接负载就降到跟输入一样了,即使接200欧的负载

请问各位老师有哪些原因可能导致驱动能力差?