DCM boost rectifier
* example of Section B.2.3

.PARAM  Rload=900 

** Analysis setup **
.tran 50u 520m 500m 50u skipbp
.four 50 30 i(vac)
.step  PARAM Rload LIST 500,900

.lib switch.lib
.lib nom.lib

Vac a1 a2 SIN 0 170 50 0 0 0
D1 0 a1 diode
D2 a1 1 diode
D3 0 a2 diode
D4 a2 1 diode

.model diode d (Is=1e-13)
 
L1  1 2x 200uH
RL1 2x 2 0.2
Xswitch 2 0 3 2 6 CCM-DCM1 PARAMS: L=200uH fs=100KHz

Rload 3 0 {Rload}
C1 3 0 150uF

R1 3 4 650k
R2 4 0 11k
R3 5 5x 3.3k
C3 5x 4 1uF
Xopamp ref 4 p m 5 LM324 
VCC p 0 12V
VEE m 0 -12V
Vref ref 0 5V
Epwm 6 0 value={LIMIT(V(5)*0.5,0.1,0.9)}

.probe
.end