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Original question:

TPS66020: Vin can be supplied from Type-C VBUS?

TPS66020EVM: About the VLDO power rail of TPS66020EVM with TUSB321

Andy Lee
Prodigy 30 points
Part Number: TPS66020EVM
Other Parts Discussed in Thread: TPS66021, TUSB321, , TPS25751

Tool/software:

Hello TI,

I'm testing the TPS66020EVM. In our application, using TPS66021 with TUSB321 and a SOM module, to power ON the device either from USB -type C (which is from dead battery mode) or one external power supply. The USB port will be in DRP as DFP mode once external power supply plugged in, I found that:

1) VLDO will be 3.3V when VBUS 5V is absent.

2) VLDO becomes 5V if applied 5V to VIN

Questions:

1) What is the VIN voltage should I use?

2) on the EVM board, EN0, EN1 option H is to select VIN jumper, should is connect to VLDO or V SYS in a dead battery mode and during start up?

3) The VLDO only supply around 30mA to supply TUSB321.? Do I need any diodes to isolate VLDO & TUSB321 from the main system voltage? is there any similar reference schematic available?

  • 0
    TI__Mastermind 31880 points

    Hi,

    Please allow me some time to review the questions.

    Regards

  • 0
    TI__Mastermind 31880 points

    Hi,

    Depends on the device you are using, please refer to the recommended VIN in the table below

    Setting EN0 and EN1 to high is to source 3A. In dead battery mode the device is sinking power and dead battery usually means system power is not ready so tying EN0 and EN1 to VIN makes more sense.

    I do not know how much current TUSB321 needs but I dont recommend using VLDO to supply the power here. Crashing VLDO will put device in error state. We do not have reference schematic with TUSB321

    Regards

  • 0 in reply to Tommy Lin
    Prodigy 30 points

    Thanks for the reply.

    We follow the spec. on the TPS6602x,

    So, in our case, do u means the sink path should be ENABLE during dead battery mode? or can we supply the the CC controller (TUSB321) using VBUS power instead of VLDO (diode with system voltage)?

    e.g.

    Without PD controller to control the CC pins & the TPS6602x EN the USB-C won't work properly, is that correct?

  • 0 in reply to Andy Lee
    TI__Mastermind 31880 points

    Hi,

    TPS66021 is capable of CC communication (PD) but TUSB321 can only perform Rp/Rd detection specified in Type-C spec. Are these parts used on two different ports? what are the requirements of the ports?

    I don't recommend using VBUS to directly source any components as it will violate power spec in the Type-C/PD spec.

    Regards

  • 0 in reply to Tommy Lin
    Prodigy 30 points

    We would like to have single USB Type-C with DRP enabled in the product for:

    1) as a UFP to sink power from USB adaptor (5V2A min.) or

    2) as a DFP mode connect to USB devices.

    Would u mind recommend USB controller(s) based on above features so to enable the product power up from dead battery scenario?

  • 0 in reply to Andy Lee
    TI__Mastermind 31880 points

    Hi,

    So you want the port to sink power while acting as DFP for USB device? Does this port need to source power? What is the highest USB speed you are looking to support? what is the end application?

    Regards

  • 0 in reply to Tommy Lin
    Prodigy 30 points

    We only have 1 USB C port in the product, serve either in DFP or UFP mode.

    Yes, in our product, the USB type C port becomes UFP while connecting to an adaptor  (That's why we need the dead battery feature of TPS6602x) or becomes a DFP provides 5V 0.9A max. (e.g. plug in a USB memory stick)

    The product is a smart HUB powered by USB adaptor or 5V dc/dc adaptor depends on customer usages. USB speed is not our concern at the moment.

  • 0 in reply to Andy Lee
    TI__Mastermind 31880 points

    Hi,

    In order to recommend a part I will need the exact power role requirements and data role requirements. The TPS6602x is just a power path controller. It does not have any data capability. If you need higher USB speed or alternate mode (e.g. USB4 speed) you need to look for an actual PD controller.

    What is the maximum power you are sinking? 20V5A? 28V5A? Or other PDO?

    Is dead battery support needed?

    What is the USB speed you are looking for? Are you looking to support alternate mode?

    Does the power role and data role needs to be dynamically changed?

    Regards

  • 0 in reply to Tommy Lin
    Prodigy 30 points

    What is the maximum power you are sinking? 20V5A? 28V5A? Or other PDO?

    Ans: 5V2A sink power, 5V 0.9A as a source

    Is dead battery support needed?

    Ans:Yes

    What is the USB speed you are looking for?

    Ans: USB2.0 high speed

    Are you looking to support alternate mode?

    Ans: NO

    Does the power role and data role needs to be dynamically changed?

    Ans: Power role swapping --> Yes

    Data role swapping --> no necessary

  • 0 in reply to Andy Lee
    TI__Mastermind 31880 points

    Hi,

    As long as the requirement stays the same, I would recommend looking into TPS25751 for DRP applications.

    Regards