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This is the structure of average current mode control (source here).

enter image description here

Please look at signal \$V_{com}\$ at the positive input of PWM modulator. For proper operation, in steady state the magnitude of \$V_{com}\$ should be in range peak to peak of ramp signal. Is there a clear procedure (almost like step by step) to guarantee this?

I tried to simulate this and even using simple integral compensation but \$V_{com}\$ is always out of range of ramp signal.

This is my simulation result with target 3V input and 2V output.

enter image description here

enter image description here

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  • \$\begingroup\$ Show your simulation schematic too please. \$\endgroup\$
    – Andy aka
    Commented Apr 2, 2018 at 15:10
  • \$\begingroup\$ And what about the op-amps - were they OK on a single 5 volt rail? And why is your reference voltage 2 volts? \$\endgroup\$
    – Andy aka
    Commented Apr 2, 2018 at 17:28
  • \$\begingroup\$ @Andyaka: I don't understand your question about OpAmp. I used reference 2V because I want output to be 2V. \$\endgroup\$
    – emnha
    Commented Apr 2, 2018 at 19:06
  • \$\begingroup\$ What op-amps are they? \$\endgroup\$
    – Andy aka
    Commented Apr 3, 2018 at 8:04
  • \$\begingroup\$ Opamp and comparator models/types undefined -- insufficient information, voting to close. \$\endgroup\$
    – Tim Williams
    Commented May 28, 2023 at 11:59

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