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POWERSTAGE-DESIGNER: Minimum Load Current in Push Pull

Part Number: POWERSTAGE-DESIGNER
Other Parts Discussed in Thread: LM25037
Hi TI,
I am using Power Stage Designer v5 tool to evaluate my Push Pull design using LM25037 for Vin=110V, Vout=24V and Iout=12A. But in the tool, minimum load current is 6A and I can change the current only between 6-12A and not below 6A. It seems it's not due to topology, can anyone please guide me regarding this issue?
Thanks in advance,
Best,
  • Suheyl,

    All double-ended topologies (half-bridge, full-bridge, push-pull) simulated in Power Stage Designer will behave the same as you are seeing with the push-pull. The effective frequency of the output inductor is 2x the selected switching frequency. This is not a limitation of the topology and has nothing to do with the controller.

    Regards,

    Steve M

  • Steven,

    So, I'm aware that the effective frequency is 2x the selected frequency in those topologies. But I don't understand how it's related to load current adjustment bar in Power Stage Designer interface? 

  • Suheyl,

    I do not know what assumptions were made when within the development of TI Power Stage Designer which led to the minimum current being limited to 50% of the max. If the output load current is 12A and each leg is carrying 50%, for some reason the simulator only seems to show the current for one leg as 50% to max. You can change the max current to be the minimum you are wanting to see the waveforms for. I tried this as below.

    Steve