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LM5146-Q1: would like to achieve class H solution based on the reference design of TIDA-020033

Shunsuke Yamamoto
Expert 7681 points
Part Number: LM5146-Q1
Other Parts Discussed in Thread: TIDA-020033, , LM5123-Q1, LM5137-Q1

Tool/software:

Hi team,

My customer would like to achieve class H solution based on the reference design of TIDA-020033, and he considers LM5146-Q1 for the dcdc converter to track the output voltage. Is LM5146-Q1 possible to use as LM5123-Q1 does in the reference design?

Best regards,

Shunsuke Yamamoto

  • 0
    TI__Genius 11385 points

    Hi Yamamoto San,

    LM5123-Q1 is a boost converter while LM5146-Q1 is a buck converter. In the design - the boost converter (LM5123-Q1) maintains a 45V from a 12V battery.  Based on your system requirement - if a buck converter satisfies your requirements (Vin range > 45V) - you can go ahead with the design. 

    I would recommend you also reach out to the designers of the design (Matt and Donovan) with what exactly are your system specs and they can guide you better. 

    Thanks,

    Best Regards,

    Taru

  • 0 in reply to Taru Kapoor
    TI__Expert 7681 points

    Hi Taru-san,

    Thank you for the reply. What I want to know is that the voltage tracking function works as a voltage tracking pin of LM5123-Q1. I think users can utilize the voltage tracking pin of LM5146-Q1 for class H solution.

    Best regards,

    Shunsuke Yamamoto

  • +1 in reply to Shunsuke Yamamoto
    TI__Genius 11385 points

    Hi Yamamoto San,

    I agree with your point here - however, from what I understand from the TIDA-02033 - the whole point of using LM5137-Q1 is to generate a boosted output for the amplifier stage (i.e. Vout > Vin). It all depends on what your input voltage range and output voltage ranges are. 

    If you are always in the stage of Vout > Vin - then you have to use a Boost Converter. If the stage is Vin > Vout - the LM5146-Q1 can work!

    Again, I recommend you speak with Donovan and Matt - explaining to them your system requirements. 

    Thanks,

    Best Regards,

    Taru