Hi sir,
We are using LM5164 converter for step down operation from 55 to 12V with load current of 0.65A.
We selected our filter value and switching frequency as per LM5164 calculator.
The problem is while we verify boundary condition of CCM or DCM by using the formula (load current (Io)>0.5*inductor ripple current) it fails as per theoretical formula.
Formula for CCM 2*L/(R*Ts) >1-D.
For DCM 2*L/(R*Ts) < 1-D.
L is inductor, R = load resistance, D = duty cycle.
Ts = 1/Fs (Fs is switching frequency).
L = 68uH, R = 18.461 , Fs = 300kHz.
2*L/(R*Ts) = 2.21 as per above values. but Duty cycle D range is 0 to 1.
Whether above formula applicable or not we need to know.