Part Number:OPT8241-CDK-EVM
hello
I am in charge of hardware engineer and will design 3D Time of flight camera using OPT8241 and OPT9221.
I have some questions about illumination board.
1.Why are there two invertor for illum_en_g . Is it impossoble to connect from illum_en to illum_en_g directly?
2. what is puspose this circuit (mosdriver) . just for making high level 3.3v ?
if we use trig_g which has 5v high level, this circuit is no need?
3. How to caculate value of inductor (L5) ?
duty : 0.5
delta v means sum of series laser forword voltage ? ex) vf : 2v . 4 string --> 8v
f: modulation freq : 40Mhz
I OUT means laser peak current? ex) 2.5A
delta I : 0.25A ( asumption 10% of peak current (2.5A)
We can get value(L) using below fomula. The value is 500nH.
Is it correct caculation we did ?
4. Why does out put voltage twice compare to inputvoltage when we use shunt circuit .
thank you.