DRV8244-Q1: Units for Calculating Switching Losses

Hi Ryo-san,

In the power switching loss equation below the units are as follows:

VVM: V

ILOAD: A

fPWM: kHz

SR: V/us

PSW: W

Best,

David

Mr. David.
Thank you for your response.

Based on the above, I calculated with DRV8244-Q1 (VQFN-HR, with PWM, DC)

13.5 x 4 x 20 x 13.5/23 = 633.9 W

Is my calculation correct?

Hi Ryo-san,

The frequency is in kHz and the slew rate is V/us so the switching losses should be much less.

Psw = ((13.5V)(4A)(20kHz)(13.5V)) / (23V/us) = 0.6339W

Best,

David