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USB-C TPS65982 : Recommended PPCABLE consumption

Younès Gahnem
Intellectual 300 points

Other Parts Discussed in Thread: TPS65982, TPS65982-EVM

Hi,

I'd like to know the recommended power supply for PPCABLE in the TPS65982.

The datasheet mentions IPPCABLELIMIT (lowest and highest). Let's say 600 mA max.

That means that I have to design my voltage regulator to 5V/1A. Is this really so ? Or is there a min. current consumption at which is it ok ?

Then I can take another regulator.

Other question : Must I necessarily use the same supply for PPCABLE and PP_5V ?

Thanks in advance and for the good job.

YG.

  • 0
    TI__Mastermind 30310 points
    The minimum power a Type-C/PD Source needs to apply at VCONN is 1 Watt (5V*200mA), from page 119 in the USB Type-C Specification. If any more power is drawn from VCONN, the Source is allowed to latch VCONN off.

    The maximum power specified for ThunderBolt on VCONN is 2.5W (5V*500mA).

    Since the TPS65982 enables over-current limiting as a source, we have set the threshold to be 600mA to guarantee that 500mA will pass through PP_CABLE to VCONN without tripping the protection.

    If PP_CABLE is tied to the same power supply as PP_5V0 as it is done on the TPS65982-EVM, you will need to account for both currents added together.

    So your minimum current to design for is 5V,200mA (PP_CABLE by itself, USB Type-C requirements).
    The maximum current to design for is 5V,3.5A (PP_CABLE for ThunderBolt VCONN + PP_5V0 when advertising 3A Type-C for VBUS current).

    There are many options in between these two values (Type-C can advertise 900mA, 1.5A, or 3A for VBUS and VCONN at 200mA or 500mA depending on ThunderBolt support).
  • 0 in reply to Brian Berner
    Intellectual 300 points

    Thank you very much Brian.

    You gave me a detailed answer. That exactly what  I wanted. 

    Thank you again for your Job. 

    Regards from Switzerland