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TL494不能带负载的问题?请大家支招,我对这个芯片不是很熟。

Other Parts Discussed in Thread: TL494

220V输入,27V12V两路输出,加电以后输出电压正常,27,12V,但是不能带负载,一带负载就掉到0V,TL494,一脚是基准2.5V2脚是电压反馈,1615是电流检测,现在问题是不能带负载,请大家支招。