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How to design a circuit to help the output of TL494 to power the IRF540

Temption up to PEak
Prodigy 70 points
Other Parts Discussed in Thread: TL494

Now I want to design a circuit  for realizing DC——DC transformation。The circuit as follow，but I found  the N—MOSFET dosen't work.Factully the output of TL494 can't power the IRF540,I give a setoff voltage from the V1.And it's still unsucessful.I want to konw how to settle this problem.Who can share some information with me.I would appreciate him very much.

  • 0
    TI__Mastermind 41310 points

    Temption,

    Why do you think that the TL494 cannot "power" the IRF540? You are NOT giving a setoff voltage, you are providing the VDS of the device (which is fairly typical in this kind of circuit). The TL494 is providing the VGS of the device to turn on the FET. As long as your circuit is properly designed, the TL494 should not have any issues with controlling the IRF device.

    Once again, you might want to do a Google search on Sepic design for more information on the circuit you have shown.

     

  • 0 in reply to Britt Brooks - Online Design Tools
    Prodigy 70 points
    Britt
    Thanks.
    In fact，my tutor tells me that the PWM output can't power the IRF540.Although my simulation is right.And I am a newbie,can you show me more information about how to let TL494 power the IRF540. I haven't found any information in TI official website.
    Temptaion.