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Lectures DCDC
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B.2.2.open-loop.cir
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Buck voltage regulator, open-loop * example of Section B.2.2 .param R=10 .param L=50uH fs=100KHz .tran 10u 2000u 0 10u .step PARAM R LIST 3,10,25 .op .ac dec 101 5 50KHz *.options stepgmin *.OPTIONS ABSTOL=10p *.OPTIONS CHGTOL=0.1pC *.OPTIONS GMIN=0.1u *.OPTIONS ITL4=20 *.OPTIONS RELTOL=0.001 *.OPTIONS VNTOL=10uV Iload 3 0 dc 0 pulse 0 3.5 100u 100n 100n 5000us 10000us .lib switch.lib .lib nom.lib Vg 1 0 28V ac 1 ; use ac 1 to get line-to-output response Xswitch 1 2 2 0 8 CCM-DCM1 PARAMS: L={L} fs={fs} L1 2 3 {L} C1 3 0 500uF Rload 3 0 {R} *Vcc p 0 12V *Vee m 0 -12V *Vref ref 0 5V *Xopamp ref 5 p m 6 LM324 *R1 3 4 11K *R2 4 5 85K *C2 4 5 1.1nF *R4 5 0 47K *R3 6 6x 120K *C3 6x 5 2.7nF *Vz 7 6 ac 1 ; change to ac 0 to get line-to-output response *Epwm 8 0 value={LIMIT(V(7)*0.25,0.1,0.9)} *open-loop duty cycle input d(t)=const Vc 8 0 0.543 .probe .end