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Original question:

BQ27546-G1: BQ27546YZFR-G1

TPS56C231: TPS56C231RNNR : Less efficeincy

Udesh Singla
Intellectual 470 points
Part Number: TPS56C231

Tool/software:

HI 

we are using TPS56C231RNNR but the efficiency of TPS56C231RNNR is around 89% at 5V/10A of current due to which we are facing too high power dissipation around 5.3W.
So please help to suggest some other alternate part whose efficiency will be around 95%-96%.
  • 0
    Intellectual 470 points

    in addition to the above points please let us know if we can some lesser switching frequency and what is the major advantage of using the higher switching frequencies.

  • 0 in reply to Udesh Singla
    TI__Expert 7895 points

    Hello Udesh,

    The below graph provides a brief look at efficiency data for TPS56C231. The green curve (upmost line) is the 5vout efficiency at 12vin and 400khz. The efficiency is above 95% at 10A.

    Efficiency will depend a lot on the inductor and switching frequency. With a lower inductor DCR and a lower switching frequency, you will see an increase in efficiency.

    You can try decreasing the fsw. The advantage of using a higher fsw is that it allows for smaller components (smaller solution size), lower Vout ripple, and faster transient response.

    If these points are not as important as efficiency for your design, then I recommend to adjust the inductor and switching frequency.

    If this helps solve your issue, please click "This resolved my issue". If you have additional questions, please reply to this thread.

    Thank you!

    Calan