Losses MOSFET

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mopeters

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I would like to calculate the losses of this buck converter.
But I don't know what current I should use for the body diode. Does anyone know?

 

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Hi,

I don´t download a 4.6MBytes picture that easily could be reduced to 40kBytes without losing any thread related informaton.
Tools to do so are on every PC, every cell phone and even online.

Klaus
 

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Will you be doing this with a spice simulation ? An excellent way
of doing this. You will need spice models for the diodes, mosfets,
L and C if you can get them.

Simetrix, LTC Spice, Cadence Pspice a few of the choices.


Regards, Dana.
 

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Presume T1 body diode will be never forward biased, T2 body diode only for a short time when T1 and T2 are both off.
=> Depends on driver timing
 

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Current is variable and so is efficiency. Usually a graph of
eff% vs load and line is given.

Component selection would proceed from next level
assembly V, I ranges, what customer demands for
those plus efficiency and dynamic attributes. Or what
you mean to sell (some of) them on.
 

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SYNC-BUCK-FET-LOSS-CALC Calculation tool | TI.com

View the TI SYNC-BUCK-FET-LOSS-CALC Calculation tool downloads, description, features and supporting documentation and start designing.
www.ti.com

...use the above...it wil tell all switching and conduction losses.
Use a low side fet with lower Qgd than Qgs.
 

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