Buck converter with current programmed control
* example of Section B.3.2

.param Va=0.6
.param fs=200KHz
.param L=35uH 

.ac DEC 101 10 100KHz
.op

* these options affect convergence
*.OPTIONS RELTOL=0.01 
*.OPTIONS GMIN=0.00001
*.OPTIONS ABSTOL=1u
*.OPTIONS CHGTOL=0.1pC
*.OPTIONS ITL4=20
*.OPTIONS ITL2=50
*.OPTIONS VNTOL=10uV
*.OPTIONS STEPGMIN
  
*.nodeset v(2)=8.1 
*.nodeset v(4)=4
*.nodeset v(5)=0.5 
*.nodeset v(ni)=0.8 
*.nodeset v(nm1)=3.9

iout 0 4 ac 0 ; use ac 1 to find output impedance

.lib switch.lib

Vg 1 0 12V ac 0 ; use ac 1 to find line-to-output response
Xswitch 1 2 2 0 5 CCM-DCM1 PARAMS: L={L} fs={fs}
* Xswitch 1 2 2 0 5 CCM1
L1 2 3 {L}
RL1 3 4 0.05
C1 4 0 100uF
Rload 4 0 2

Xcpm ctr ni nm1 nm2 5 CPM PARAMS: L={L} fs={fs} va={Va} Rf=1
Ei ni 0 value={i(L1)}
Em1 nm1 0 value={V(1)-V(3)}
Em2 nm2 0 value={V(3)}

Vic ctr 0 dc 1.4V ac 1 ; use ac 1 to find control-to-output response

.probe
.end