What is wrong in this buck converter spice simulation?

Discussion in 'General Electronics Chat' started by shankey_1919, Mar 24, 2010.

  1. shankey_1919

    Thread Starter New Member

    Feb 9, 2010
    6
    0
    Hello everyone. I am trying to simulate the operation of a dc to dc converter on LTSpice. Input is 18V DC, o/p is 9V DC with 3 A current... The output seems to be related to the duty cycle as the o/p voltage are duty cycle =1 is almost twice the o/p voltage at duty cycle = 0.5. But why does the output have very low voltage?
     
  2. shankey_1919

    Thread Starter New Member

    Feb 9, 2010
    6
    0
    Hello guys.. I just realised the mistake I made. I should have applied the V2 pulse between the gate and source. But even applying the above causes a similar output to the attachment in the above post if the mosfet used is the default one in LTSPICE. Using any other mosfet with low Rds(on) seems to solve the issue. Thanks...

    (I have attached the new simulation results)
     
Loading...