STB130NH02L STP130NH02L

10/13

SW1

SW2

APPENDIX A

Buck Converter: Power Losses Estimation

The power losses associated with the FETs in a Synchronous Buck converter can be

estimated using the equations shown in the table below. The formulas give a good

approximation, for the sake of performance comparison, of how different pairs of devices

affect the converter efficiency. However a very important parameter, the working

temperature, is not considered. The real device behavior is really dependent on how the

heat generated inside the devices is removed to allow for a safer working junction

temperature.

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voltage to avoid the cross conduction phenomenon;

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feedback on the gate

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