Example DCM boundary
K uses the Lp entered on this example. CCM and DCM follow the strict comparison only.
Worked example
Primary inductance 0.001265625 H
Use the Lp you type
Lp 0.001265625 H
Show equation
Lp=Vin_min^2*Dmax^2/(2*Pin*fsw*Krf)
Kcrit 0.36
Show equation
Kcrit=(1-D)^2
K 0.2
Show equation
K=2*Lp*fsw/Rload*(Ns/Np)^2
Mode DCM
Show equation
CCM if K>Kcrit, DCM if K<Kcrit
Empty boxes are not zero. K and Kcrit appear only when D, Lp, fsw, Rload, Ns, and Np are nonzero. Gap length uses the selected Lp, Np, and Ae. High voltage is not a safety approval.