I am trying to design a 12v,10A buck converter using a with LTC1775 and have gone through the calculations assuming a 40% inductor ripple current and a switching frequency of 150kHz. This gave an inductor value of 10uH and a mosfet with Rds(on) of 0.014ohm. So based on these i have selected IRLR3915 NMOS and 7443558100 inductor.
My main concerns are the following:
- Are these two good choices with regards to the output current or they are overkill?
- Should i attach a flyback diode across the output incase I have an inductive load like a motor?
- Are the Cin and Cout capacitors adequate? Based on datasheet formulas our output voltage ripple is supposedly ~60mv but the simulation only shows ~10mv
I can attach the calculations if its needed.
Thank you, I really appreciate your guys help.