Part Number: DRV8711
Hi,
I'm going through the DRV8711 datasheet and have some confusion regarding the equation (3) in the section 7.3.9, External FET Selection.
It's generally clear that this equation governs the relationship between maximum acceptable gate charge Qg of the selected MOSFET and the configuration settings of the chip itself. However, some of the parameters included are somewhat unclear. What is a '20mA' constant? Apparently it's some kind of the value of some current, but which one? Why is '2*DTIME' involved? What does '4' constant in denominator signify? And more questions could possibly follow...
So, summing up, would it be possible to provide some background on this equation and explain the science and reasoning behind it in more details?
Thank you, Michael