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UCC28070无法工作

Other Parts Discussed in Thread: UCC28070

利用推荐电路做的400WPFC,90V~260VAC输入,发现输入调到200VAC输出都不能稳压在390V,而是线性上升,测试UCC28070根本不工作,没有PWM输出,供电电压15V是外接的,SS端电压6V,VAO电压5V,是不是反馈出问题了?