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LM25101C and LM5101C

Other Parts Discussed in Thread: LM5101C, LM5106


I have three questions about LM25101C and LM5101C.

1.I think that two devices have different Hb to Vss(LM25101C is 100C, LM5101C is 118V), but is there the difference in any other two devices?

2.Does have two devices short through prevention or prevention of penetration function?

3.Please teach me the calculation method of the capacitance of bootstrap capacitor. 

Best regard,

Please teach me the calculation method of the capacitance of bootstrap capacitor.

  • Hello

    I'm sorry to be pressing, but please teach me those questions.

    Best regards,
  • Hi Takahiko-san,

    Sorry about delay responds, For you questions:
    1. There is no difference between the two parts expect the maximum bootstrap voltage you have mentioned.
    2. Both of them don't have shoot throught prevention function inside.
    3.The bootstrap capacitor should be sized to have more than enough energy to drive the gate of MOSFET high, a good rule of thumb is size Cboot to be at least 10 times; As large as the equivalent FET gate capacitance(Cg). Please refer to the page13 of LM5106 Datasheet for more detail calculation.

    Best Regards,