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TI Home » TI E2E Community » Support Forums » Power Management » SIMPLE SWITCHER® » SIMPLE SWITCHER® - Forum » LM3150 MOSFET selection
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LM3150 MOSFET selection

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Rick Barnich
Posted by Rick Barnich
on Apr 09 2012 13:49 PM
Prodigy50 points

When designing with an LM3150 and ambient temp > 30 Deg C, M2 defaults to a FDD8647L device. At 50 Deg C, M1 & M2 are restricted to the FDD8647L.  I am then unable to substitute other devices. At 30 Deg C, I can select alternate devices. There are better devices than the FDD8647L (BSZ040N04LS G). WHy am I restricted to the FDD 8647L?

LM3150
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  • Frank De Stasi
    Posted by Frank De Stasi
    on Apr 10 2012 11:25 AM
    Intellectual1705 points

    I will forward this to our Webench guy.

    Frank D

     

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  • Akshay Mehta
    Posted by Akshay Mehta
    on Apr 10 2012 12:55 PM
    Expert4145 points

    Hello Rick,

    Webench goes through all the possible FET combinations to check if the FET is feasible for the design requirements. If the power dissipation and junction temperature requirements are not met then it will reject that FET and move on to another. If there are no FETs found that are rated for the requirements, then the design is rejected quoting that no FETs in the database were found.

    I believe that at 50C, not many FETs can make it. I would like to investigate further, so if could, please send us your design requirements in terms of the input voltage range and the load output voltage and current. 

    Regards,
    Akshay 

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