I have a buck converter with a PWM circuit and Control Circuit in LTSpice. I'm wondering, how do I simulate values for load regulation and line regulation?

I was thinking for line regulation I could sweep the input voltage? But for load regulation, all I can think of is having a switch with an extra resistor that turns on and changes the output resistance.

  • \$\begingroup\$ Usually that plus the step response you described by the switch (or stepped source or load). It depends on how deep you want to go. \$\endgroup\$ – winny Dec 8 '19 at 18:01
  • \$\begingroup\$ You can add a current source at the load and sweep that while keeping everything else constant. \$\endgroup\$ – Michael Dec 8 '19 at 18:46
  • \$\begingroup\$ @Michael And then how would I calculate the % value for load regulation. Do I have to take the time taken to sweep into account? \$\endgroup\$ – AlfroJang80 Dec 9 '19 at 19:19
  • 1
    \$\begingroup\$ You sweep the current source to see the effects of different loads on the output voltage. A small current means a lighter (big resistor) load. LTSpice lets you do current sweeps, so there will be no time taken, it's a DC measurement. The % value would be from the changes in output voltage vs current \$\endgroup\$ – Michael Dec 9 '19 at 20:59

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