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Type: Posts; User: lipitimisieu

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  1. Replies
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    Closed: Re: Synchronous Buck Converter FET selection

    Same remark as Easy Peasy, 60 - 65°C is not bad at all, it's a great improvement since your first post. I still recommend you to calculate the theorical power dissipation in your MOSFETs, and then...
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    Closed: Re: Synchronous Buck Converter FET selection

    My advice would be to calculate the power losses with each MOSFET, and compare the result. Use an excel sheet with each MOSFET parameters, so you can easily add new mosfets.

    For the power losses...
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    Closed: Re: Synchronous Buck Converter FET selection

    Ben,

    Here is the part of the datasheet allowing you to calculate the power dissipation of the chip:
    154205

    With the last mosfet you used:
    Pd = 24V(9mA + 615k(37nC +25nC)) = 1.13W

    1.13W *...
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    Closed: Re: Synchronous Buck Converter FET selection

    Hi, I have worked on several LT ICs, and to me the problem you are encountering may be related, as Easy peasy already told, to the switching specs of your si7145dp MOSFET. Qg on this fet is 150nC at...
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