AVERAGED BUCK (buckavg.cir)
*********** OUTPUT IS V(4) *****************
********** CIRCUIT PARAMETERS **********
.PARAM D=.4
.PARAM L=1MH
.PARAM C= 100UF
.PARAM VS=50
.PARAM R=4
********** CIRCUIT DESCRIPTION *********
VS 1 0 {VS}
L 2 3 {L} IC=0
C 3 0 {C} IC=0
R 3 0 {R}
XSWITCH 1 0 2 PWM
********** AVERAGED SWITCH MODEL *******
.SUBCKT PWM A P C
GAP A X VALUE {D*I(VC)}  ; controlled current source Dic
ECP X P VALUE={D*V(A,P)} ; controlled voltage source Dvap
VC X C 0                 ; to measure ic for controlled current source
.ENDS
****************************************
.PROBE
.TRAN 10uS 6MS UIC
.END