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TPS25763-Q1: TPS25763-Q1

Part Number: TPS25763-Q1
Other Parts Discussed in Thread: TUSB1146-Q1, TUSB1146, TUSB564-Q1, TUSB1064-Q1

Tool/software:

In TPS25763-Q1 datasheet "8.3.3 External NFET and LSGD" section,  it describes TPS25763-Q1 is a DisplayPort sink device and operates as a Dual Role Power (DRP) port using the application configuration GUI default settings, does this mean the TPS25763 can only be used as a sink devices?

I'm working on DisplayPort  Alternate Mode over USB-C, in order to realize the host side can be connector to the projector,  I plane to use TUSB1146-Q1+TPS25763-Q1 in the host port,but I don't know if this is feasible, I worried that the TPS25763-Q1 can only be used as a sink port, not a source port.

Please let me know if there is any problem with my solutin?

Thanks!

  • Hi Li,

    TPS25763-Q1 is intended to be used as a power source, DisplayPort sink device.  If TPS25763-Q1 is connected to a source-only port on the other end of the USB cable, it will request 5V/0.1A.  This is done to ensure compliance with the DisplayPort Over USB-C specification.

    Regards,
    Eric

  • Hi Eric,

    That is to say, in any case, the source port transmission display signal over type c don’t need provide power,  it’s all powered by sink port itself?

  • TPS25763-Q1 requires an input supply, usually 12V nominal.  It can provide power to the Type-C port (up to 65W).  When it connects to another device that also wants to be the power source (for example, a PC), the TPS25763-Q1 will not actually draw power, since it already has a dedicated supply.

  • My problem is that my device is host, which needs to transmit video signals and provide power supply through type c. I plan to use TUSB1146 as mux. How should I choose the PD chip (integrated protocol and buck boost controller)?

  • My device is host, and the downstream sink device can't provide power, so will tps25763 provide power at this time?

  • Yes, TPS25763-Q1 will be the power source.

    Regards,
    Eric

  • So there is no problem with me using TUSB1146 as displayport alt mux and tps25763 as PD

  • So tps25763-q1 can be used as both sink and source apply. Is my understanding correct? The data sheet describes that it is a sink device, I thought it could only be used as a sink apply.

  • I want to clarify there are two different categories of source and sink.

    There is power source and sink, then there is DisplayPort signal source and sink.

    TPS25763-Q1 only supports DisplayPort signal sink.  It also should only be used for power source applications.  The PD controller is able to assume a power sink role for the purposes of DisplayPort compliance only.  The system should not actually be powered from the USB Type-C port.

    So there is no problem with me using TUSB1146 as displayport alt mux and tps25763 as PD

    It looks like TUSB1146-Q1 is meant for DisplayPort signal source applications.  Please submit a separate ticket for this part to confirm.  The officially supported MUXes for TPS25763-Q1 are TUSB564-Q1 and TUSB1064-Q1.

    Regards,
    Eric

  • What I understand is that whether the displayport signal transmission direction is source or sink depends on MUXes. TUSB1064-Q1 is a sink MUX, so the type c is a sink role. TUSB1146-Q1 is source MUX, so the type c is a source role. When it is a host, doesn't it need to power the downstream port? I thought that when it was the host, it not only needs to provide display signals to the sink port, but also to provide power via PD

  • The power and signal roles are independent of one another.  For example, a laptop dock sends power to the laptop but is the signal sink.

    Regards,
    Eric