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使用LM3409HV作电池充电,接上负载没有输出

Other Parts Discussed in Thread: LM3409HV

利用LM3409HV芯片恒流给镍氢电池充电,输入电压在40~65V之间,输出电压24~35V,根据PDF文档画出了电路,但是实际使用时不接负载有输出,电压为输入电压,但是接了负载之后电压直接变为零。请问是什么问题呢