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TPS923650: the Buck & Buck-Boost mode

Tommy
Intellectual 515 points
Part Number: TPS923650
Other Parts Discussed in Thread: TPS923651, TPS922051, TPS923654, TPS923652

Tool/software:

Hi E2E,

We want to use this TPS923650D2DSGR to automatically adapt Buck & Buck-Boost to work.


Example: When the input is 7~16V, the load is 2~3 leds (8~12V), and the current is within 1A.


We learned that when Vin at 7V, and The TPS923650 load is in this mode：

when Vin at 16V, The load shoud be in the other mode：

Can we adapt the full input voltage range of 7~16V without changing the LEDs connection? as the following block diagram:

Thanks

  • 0
    TI__Mastermind 23190 points

    Hi Tommy,

    Please refer to my comments below:

    1. TPS923651/0 can only support Boost and Buck-Boost topology. It does not support Buck topology as TPS922051/0 does.
    2. TPS923650 cannot be used here due to the current limit.
    3. TPS923651 is not recommended to be used in this way due to the complexity in judging the boundary of switching between Boost and Buck-Boost topology.
    4. I would recommend you use TPS923654/5 in Buck-Boost topology for all your input / output condition. You do not need to switch between different topologies with TPS923654/5.

    Best Regards,

    Steven

  • 0 in reply to Steven Li
    Intellectual 515 points

    Hi Steven,

    Thanks for your answer.

    As you said, I can set an  Buck-Boost topology by using TPS923654/5. The output current we designed should be around 1A, can TPS923652 be used?

    By the TPS92365x Series, I also see two topologies as shown below:

    Can we use TPS923652 by Buck-Boost topology for all the input / output condition to design？

    Thanks

  • 0 in reply to Tommy
    TI__Mastermind 23190 points

    Hi Tommy,

    TPS923652/3 in Buck-Boost topology cannot be used here due to current limit.

    TPS923654/5 in Buck-Boost topology can be used here.

    Best Regards,

    Steven