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LM5156-Q1: Simulation support

Balaji B
Prodigy 30 points

Part Number: LM5156-Q1
Other Parts Discussed in Thread: LM5156

I had utilized the flyback simulation of LM5156 provided by the TI itself. I had done some modifications in that for getting 28V as output since the TI provided simulation is for output 5V. I had modified flyback transformer ratio in the script itself. Ihad tuned feedback resistor in opto based feedback section.

Flyback ratio (Pri : Aux : Sec) : 1:1:3

Flyback transformer inductance : 15uH

Feedback bottom resistor value : 1.36k

But my output stayed at 5V only not increased to 28V. I'm using Orcad pspice 17.4 for my simulation

  • 0
    TI__Mastermind 24275 points

    Hi Balaji, 

    Thanks for using E2E. 

    It is good to start with a testbench that is already working, like you did. 

    Then you should do the changes step by step, so that it is easier to figure out later where the problem is. So first only change the transformer and check if it still works. Then change the feedback path later. 

    Best regards

    Moritz