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UCC28700-Q1: ucc28700 反激电源无法正常启动

Part Number: UCC28700-Q1

VDD 电压一直不能稳定,如下图,电路参考datasheet, 变压器匝比Np/NS/NA:43/5/6,   输入电压范围130~470V,输出电压10V/3A