TPS25820: TPS258020 : Sourcing a PD compilant device

Juan Jose Frutos Andreu

Part Number: TPS25820

Hi,

What will happen if we connect a PD compilant sink device to the TPS258020? Will the TPS258020 source it maximum current allowed by CHG config? or will the PD device source the minimum allowed for a non PD compilant source?

Best Regards,

Juanjo

over 5 years ago

0 Darwin Fernandez over 5 years ago

TI__Mastermind 40100 points

Hi Juan,

When the TPS25820 advertises to the sink device its current capability, the sink device and source should negotiate the current through VBUS. Note the TPS25820 will not turn ON it's pass FET unless there is a compliant sink device connected.

Regards,
Darwin

0 Juan Jose Frutos Andreu over 5 years ago in reply to Darwin Fernandez

Intellectual 610 points

Yes, the power delivery compilant system to which the system will be pluged is a Dual Role Port.

I assume that the current negotiation could be done, I am right¿

Best regards,

Juanjo

0 Darwin Fernandez over 5 years ago in reply to Juan Jose Frutos Andreu

TI__Mastermind 40100 points

Hi Juan,

That is correct, when the roles are set (sinking/sourcing), the current is negotiated.

0 Juan Jose Frutos Andreu over 5 years ago in reply to Darwin Fernandez

Intellectual 610 points

Hi Darwing,

We have made a set up with our prototype. But we are having some issues with the TPS258020 behaviour.

We use a 5.1KR Pulldown resistor in CC1 line for testing purposes. During the test stage, when the device was powered, SINK signal going LOW.

Once we test every signal and everything was ok, we remove the 5.1KR resistor and we test the prototype against several PD compiland Dual Role systems, but the prototype is not delivering power (SINK signal is not going LOW).

Do you know what could be the issue here?

Regards,

Juanjo

0 Darwin Fernandez over 5 years ago in reply to Juan Jose Frutos Andreu

TI__Mastermind 40100 points

Hi Juanjo,

Locking this thread since we are discussing this here:
e2e.ti.com/.../751037

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TPS25820: TPS258020 : Sourcing a PD compilant device