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求助用webench无法使用LM3409HV的问题

Other Parts Discussed in Thread: LM3409HV

请问:

    我需要DC-DC降压带PWM调光的IC,具体参数是:输入48Vdc,输出40-45Vdc,输出电流500mA,带PWM调光的IC。

我查找到用LM3409HV可能会满足我的需求。于是用webench输入以上参数,但是给出的设计方案中没有LM3409HV。

请问这是怎么回事?

 我如果一定要用LM3409HV,该怎么使用webench来设计