while simulating this in Pspice A/D i get above. please help me.
*Buck Converter
*PWM
VRAMP 1 0 PULSE (1 4 0 398U 1U 1U 1U 400U)
R1 1 0 1K; dummy load
VREF 5 0 DC 12
R1 5 0 1K; dummy load
*Amplifier
E1 7 0 8 5 30
*Power Circuit
VI 2 0 DC 15
SI 2 3 1 7 SWITCH; includes comparator...