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UC28070能否在48V升压到300V,



设计功率为1000W,想用交错式PFC电路做一个升压电源,但是调到250V就不能再往上升了,60V左右才可以,但是升到电压300V后,往小调输入电压到30V仍然能工作,请大师帮助解决分析一下是什么原因。