# MOSFET Switching Loss Formula

I'm trying to calculate the switching loss of the MOSFET which is used for a DC-DC Boost converter. Input Voltage : 9V-16V

Output Voltage : 30V

Output Current : 0.3A.

Switching Freq : 455kHz

Based on this [App Note][1] the Switching loss formula is given on page 3, equation 4.

If I calculate the switching loss based on the above formula, it comes to around 14W.

In this Article, the formula for calculating the switching loss is different.

Which one is the correct formula and could you explain the reason for 2 different formulas?

• these formulas may well be identical because each of GS2 and GD capacitances is charged by a current $I_G/2$ – V.V.T Apr 7 at 12:15