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WEBENCH®工具/ LM34936：LM34936

user4497928
Prodigy 10 points
Part Number: LM34936
Other Parts Discussed in Thread: LM5176

Tool/software: WEBENCH®设计工具

Dear 

     是这样的，我这边需要一个8-14V输入，12V，10A输出的电路。webench为我推荐了LM34936的设计电路，我们由于结构限制修改的部分器件。现在PCBA出来了，调试时，发现当输入电压高于11.8V时，输出12V才正常。当输入电压低于11.8V时，输出电压不足12V。请帮忙看下是否选择的替代器件不满足要求。

  • 0
    TI__Guru* 78060 points

    Hi User,

    Thank you for considering the LM34936. Pleaes post in English such that you can get faster supportt.

    The LM34936 should be the right choice for your applications. Will we are reviewing your design, can you run the following design calculator to double check your part selection? Note that the LM34936 shares the same design calculator as the LM5176.

    www.ti.com/.../snvc208

    Thanks,

    Youhao Xi, Applications Engineering

  • 0 in reply to Youhao Xi
    TI__Guru* 78060 points

    Hi User,

    Have you checked against the calculator?  You schematic connections look good. When you do the layout, please follow the Layout Guidelines presented in the datasheet, and pay attention to the AGND and PGND separation, and only connect the two at one point which is basically the IC DAP.  Also route the pair of the current sense traces, and the pair of MOSFET gate drive (G and S) traces, closely side by side.

    Good luck in your design.

    Thanks,

    Youhao