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TPS51124: All Ceramic Output Capacitance

Antenna_Head
Genius 11395 points
Part Number: TPS51124

Team-

We have a customer who is implementing the TPS51124 dual DCAP controller with all-ceramic output capacitors.  They have included the ripple injection networks commonly recommended for the single controllers.

Application Report SLVA453 explicitly states that "TI does not recommend using the ripple injection on the dual D-CAP Mode controllers because it might cause channel-to-channel interference issues."

Has anyone tried ripple injection with the TPS51124?

Any other comments here?

Is the SPICE model of the device sophisticated enough that a channel-to-channel issue would be revealed?

Thanks, Best, S. Dunbar, AFA Colorado

  • 0
    TI__Mastermind 18510 points

    Hi,

    I haven't tried on 51124, but tried on 51225 before, actually, It's a hard work to tune it if you pass rigorous transient spec with wides input range, especial for the lower input voltage. but if there is no limited about output cap size and quantity, we can make it finally.

    I have no idea about the real reseaon of the states in SLVA453 you said, I think, based on different design, maybe some parts will get the interference issue.

    I suggest customer to do real test on their own board other than simulation if they really need this request, and must do fully performance test to verify either, such as transient(at least 10~90% 0~50%, 50~100%..), ripple(each loading), system running for long time and even PM/GM test.

    BR,

    Yuchang