Other Parts Discussed in Thread: LM5146
Hi!
I am designing buck from 75-40V (avg48V) to 36-5V (digipot trimmable) 8A load
I want to use two gan3r2-100cbe for high and low side.
But what's confusing me, is that I see in each ev board design (also webench):
Lower Rds and higher Qg for high side
And higher Rds and lower Qg for low side.
I tried to find why and didn't succeed. Only reason I see is cheaper design.
And probably it is also about Ton Toff sequence.
Can You explain me?
Basic question: may I use identical MOSFET for high and low side?
Should I care about Ton Toff, or controller does itself?
My main goal is highest effecient design because of thermal requirements.
I see that the lowest Qg and Rds I have the better is efficiency.
Stas