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TPS2373-4EVM-758: PD Rclass value

BJ Han
Expert 2035 points
Part Number: TPS2373-4EVM-758

Dear TI,

We will contact you during the current compatibility test.

Class 5 is not recognized.

Is the calculated value correct?

Other products are class 5, 21.3 ohms.

Thank you.

  • 0
    TI__Genius 9230 points
    Hi BJ,

    CLSA & CLSB are not in parallel. They are selected during their respective finger. See the functional block diagram on page 15 (www.ti.com/.../sluscd1a.pdf).

    Also notice that a regulated voltage of 2.5V is output from the CLSA & CLSB pins, not 10V.

    Let me look for the correct current values that need to be sensed by the PSE for class 5 power & I can get back to you.

    Thanks,
    Thomas A.
  • 0 in reply to Thomas Amlee
    Expert 2035 points
    Hi Thomas,
    Thank you for your attention and support.
    Current up to Class 4 current is 40mA.
    -. Class 0 : 0 to 4
    -. Class 1 : 9 to 12
    -. Class 2 : 17 to 20
    -. Class 3 : 26 to 30
    What is the current classification current for class 5 to class 8?
    Thank you.
  • 0 in reply to BJ Han
    TI__Intellectual 1695 points

    Hi BJ,

    For bt. standard classification, there are two class resistors on PD side. And PSE will apply more than 2 finger class events.

    For class 5 to class 8, the first two class events will use class resistor A and it will be set to class 4 resistor and the current is 36-44 mA.

    And then for different class, PSE will apply other class finger events using class resistor B. After the first 2 finger class events,

    For class 5, it will apply 2 more class finger events and the resistor B will be set to class 0 and the current is 0-4 mA.

    For class 6, it will also apply 2 more class finger events and the resistor B will be set to class 1 and the current is 9-12 mA.

    For class 7, it will apply 3 more class finger events and the resistor B will be set to class 2 and the current is 17-20 mA.

    For class 8, it will also apply 3 more class finger events and the resistor B will be set to class 3 and the current is 26-30 mA.

    Thank you.

    Best Regards

    Jack Chen

  • 0 in reply to Jack CCY
    TI__Genius 9230 points
    BJ,

    Jack's answer is the way to go :)

    Best,
    Thomas A.
  • 0 in reply to Thomas Amlee
    Expert 2035 points
    Hi Jack, Thomas
    Thank you for your attention and support.
    Thank you.