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【感恩TI】UC3845反激电源控制波形占空比大小不均异常

Other Parts Discussed in Thread: UC3845, LM358

1.问题描述:芯片用的3845,工作在连续模式,输入180V左右,输出一路100V,5W,一路12V,2W,问题是,一旦把变压器100V的部分接入电路就会造成控制占空比不均匀,大小差很多

2.帖子链接:www.deyisupport.com/.../1643.aspx

3.解答问题的TI FAE: n

4.体会:

A.当调机时候发现输出不正常首先看自己的元器件有无用错,电路是否正确

B.以前没做过双路输出电源,看了n 的回答,多路输出功率大的做主路输出,这里选择功率大的5W并且输出电压比较高(100V)做主输出,要是同样用

UC3845做176-264VAC输入,输出230V400mA恒流,输出负载是几万UF的大电解电容,用LM358做恒流,那又应该怎样呢?那供电应该怎样供电