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LM62460-Q1: Load sharing with 3 devices

Lee, Sam
Expert 5215 points
Part Number: LM62460-Q1
Other Parts Discussed in Thread: LM62460, LM25143, LM61495, LM25148, LM61480

Hello team,

  

I’m looking at an apps note for “Configuring LM62460 for Dual-Phase Operation“.

For more load sharing, is it possible to implement Three-Phase operation with 3 ICs?

  

Thanks,

Sam Lee

  • 0
    TI__Genius 9990 points

    Hi Sam,

    If you want to achieve three-phase operation with 3 ICs, you need to add external circuit. I want to ask what is the load? What is the application? If the current is relatively large, you can consider using LM61495 or controller like LM25143 or LM25148. Thanks.

    Aurora

  • 0 in reply to Aurora Tie
    TI__Expert 5215 points

    Hi Aurora,

    Thank you for your reply. Yes, I know that LM61495 supports 10A, but those devices(LM62460, LM61480/95) will have the similar thermal spec, right? At higher temp over Ta=100C, the multiphase will help mitigate the thermal. (controller is not preferred.)

    I'm curious about the external circuit when implemenitng three-phase operation.

     -. Does that require adding only one more op-amp to the dual phase circuit?

     -. Also, phase shift will be controllable?

     

    Thanks,

    Sam Lee

  • +1 in reply to Lee, Sam
    TI__Genius 9990 points

    Hi Sam,

    Yes, LM62460, LM61480/95 have the similar thermal spec. 

    I drew the circuit in the picture below. Please compare the final voltage with the voltage of each channel, and then give it to FB pin. Thanks.

    Aurora