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TPS923655: Boost configuration with 5v input

Elan
Prodigy 90 points
Part Number: TPS923655
Other Parts Discussed in Thread: TPS923652, TPS923653,

Tool/software:

We'd like to use this chip to power an 18v/500mA COB, using the chip in a boost configuration.

In using the Excel-based tool, when using 5V as input, the efficiency is only 85% and temperature rise is ~30 degrees.

With 9v input, the efficiency leaps to 91% and temperature rise is only ~9 degrees.

Does it make sense with 5v input to pursue an additional external boost stage to 9v or 12v? Otherwise it seems like the device is going to run quite hot.

Many thanks!

  • 0
    TI__Mastermind 23460 points

    Hi Elan,

    Elan said:
    Does it make sense with 5v input to pursue an additional external boost stage to 9v or 12v?

    Yes, it will make the TPS923655 cooler if you first use a constant-voltage boost stage to convert the 5V input to a middle voltage like 9V or 12V and then power the TPS923655 with this middle voltage. Actually, it is possible to use TPS923652 / TPS923653 in this condition.

    Best Regards,

    Steven