NextFET Normalized Power Loss vs. Output Voltage

Craig MacKinnon

Other Parts Discussed in Thread: CSD86350Q5DEVM-604

I have examined a few NextFET datasheets looking for suitable power block for a 60 Watt buck convertor (10V - 6A out maximum) and notice that the Normalized Power Loss vs. Output Voltage curves max out at an output voltage of 5V. Understanding that these products have been optimized for low duty cycle high current applications, can one extrapolate from the aforementioned curve that device power losses at an output voltage of 10V will be approximately 3x greater than those observed at an output of 1.3V all other things being equal?

over 8 years ago

0 Brett Barr1 over 8 years ago

TI__Mastermind 18200 points

Craig,
Where did 3x come from? I think this would vary from part to part, so what part in particular are you looking at?

0 Craig MacKinnon over 8 years ago in reply to Brett Barr1

Prodigy 80 points

Hi Brett

The x3 comes from extrapolating along the normalized power loss vs. output voltage curve in figure 8 from the CSD86350Q5 data sheet. The CSD86350Q5DEVM-604 eval module is not suitable for evaluating power losses for the output conditions spec earlier in this discussion (60 Watt buck convertor (10V - 6A out maximum)). Short of laying out a test board, does TI have a quick and dirty solution to evaluate power losses of the CSD86350Q5 part?

cheers,

Craig

0 Brett Barr1 over 8 years ago in reply to Craig MacKinnon

TI__Mastermind 18200 points

Craig,
Got it. Yes, I think its fair to say this curve will remain linear, so 3x would be a good normalization factor.

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NextFET Normalized Power Loss vs. Output Voltage