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Original question:

TPS2372: Combine CLSA and CLSB resistor

TPS2372: TPS2372 CLSA and CLSB problems

Pan Peng
Prodigy 70 points
Part Number: TPS2372

Hi,

As shown in the datasheet, CLSA (first and second class event) and CLSB (third and any subsequent class event). As I understand, if it is class 0~4, The class is decided by the resistance of CLSA, Why should the resistance of CLAB keep same as CLSA in class 0~3? 

And When does this switch open and How is it controlled?

  • 0
    TI__Mastermind 21320 points

    Hello Pan Peng,

    As you noted in the block diagram,  only one class pin is used at a time, and internally one is disconnected while the other is being used. 

    Therefore, if the PD is class 0-4, then the class_B pin does not have to match. We do that for uniformity. 

    The pin switches over after Class 4. It is controlled by internal state engine. 

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments