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tps53647: tps53647

Bruce Llin
Prodigy 140 points
Part Number: TPS53647
Other Parts Discussed in Thread: TPS40428, TPS544B20, TPS544C20

Hi,

Base on TPS53647  datasheet page 95 inductor calculate formula, if TPS53647 work 12V input and  1.0V/120A output load, the inductor should about 150nH, so demon board use Pulse PA2607.151NLT (150nH/41A/0.29mohm, 10.4*7.9*7.4),

My question is if TPS53647 work on 1.0V/100A or 80A load, base on TPS53647 datasheet inductor calculate formula, the inductor should more than 180nH, which is very match with TI WEBENCH@ Designer tool, which recommend use Wurth: 744309025 (250nH/47.5A/0.165mohm, 14.5*13.5*9.5), I don't know which one is correct?

I have same confuse for other TPS544C20, TPS544B20 and TPS40428, and I also attached a spreadsheet for you reference, hope for can get your great help, thanks.

 

Best regards,

Bruce

 

  • 0
    TI__Expert 5965 points
    Hi Bruce,

    There is trade-offs in inductor selection. Lower inductance will have smaller size and better transient performance, while have slightly lower efficiency because of higher core loss. Higher inductance usually will require larger size at same current level, but will have higher efficiency. The datasheet equations usually target for small solution with decent efficiency, while Webench is targeting higher efficiency. In your case, we would recommend 180H to have balance between efficiency and size.

    Regards,
    Weidong