BUCK CONVERTER USING IDEAL SWITCH (bckideal.cir)
*************** OUTPUT IS V(4) ***********************
************* CIRCUIT PARAMETERS *****************
.PARAM INPUT=50
.PARAM DUTY=0.4
.PARAM RLOAD=4
.PARAM L=1mH
.PARAM C=100UF
.PARAM FREQUENCY=5K             ; switching frequency

.TRAN 10US 6000US 0 2US UIC     ; transient analysis
***************CIRCUIT DESCRIPTION*****************
VS 1 0 DC {INPUT}
SW 1 3 2 0 SMOD                 ; ideal switch
D1 0 3 DMOD
L 3 4 {L} IC=0
C 4 0 {C} IC=0
R 4 0 {RLOAD}
***************************************************
*Control for switch:
VPULSE 2 0 PULSE (-1 1  0  1nS 1nS {DUTY/FREQUENCY} {1/FREQUENCY})

.MODEL SMOD VSWITCH (RON=.001 VON=.1 VOFF=-.1)
.MODEL DMOD D(N=.001)     ;simulates an ideal diode
.OPTIONS NOPAGE ITL5=0
.PROBE
.END