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losses

cheniour

Member
hello
Iwould like to calculate the conduction losses in the mosfet pmf-280un but I can't calculate the rms value of the current to calculate conduction losses
vgs =1.8 V
RDS=460 Milli ohm , the current Id =0.0075A and the stitching frequency equal 32.768 KHZ ,input voltage 0.5 volt
the datasheet of this mosfet https://media.digikey.com/pdf/Data Sheets/NXP PDFs/PMF280UN.pdf
The problem is in the rms value of the current how i can calculate it
 

ronsimpson

Well-Known Member
Most Helpful Member
Can you show me the waveform?
Please include the schematic.
If the waveform is complicated, you can measure the V and I at 10 places across the wave and then average the power. Not the best but works.
 

cheniour

Member
The waveform voltage and current across the first mosfet and the second scheme is the schematic
how i can calculate I rms current with datasheet please if it is possible ?
1607221146094.png
1607221334079.png1607220687332.png
 
Last edited:

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