TPS25750: About TPS25750 power role

Fabio Gou

Expert 4445 points

Part Number: TPS25750

Why the TPS25750 can not operate as source? I guess if one product can operate as DRP, the it can operate as source.

over 4 years ago

0 Chuck Branch over 4 years ago

TI__Mastermind 32751 points

The TPS25750 has a 5V power path that will allow power to be source, but only at 5V. The high voltage power path does not support output current limit, so we do not enable any source except for a 5V only source DRP.

0 Fabio Gou over 4 years ago in reply to Chuck Branch

TI__Expert 4445 points

Hi Chuck, Thanks. I got it. But I sill have a question. When TPS25750 is in DRP mode (Battery OTG mode) , it can automatically select the power path between PP5V and PPHV, which depends on the USB-C negotiation. Is it right?

+1 Chuck Branch over 4 years ago in reply to Fabio Gou

TI__Mastermind 32751 points

That is correct.

0 Fabio Gou over 4 years ago in reply to Chuck Branch

TI__Expert 4445 points

From this general model of USB-C negotiation, In only source, the switch will be always connected to Rp.

So in this situation, The PPHV power path of TPS25750 can not be select. The PP5V power source will be always turned on by default.

Is my understanding correct？

+1 Chuck Branch over 4 years ago in reply to Fabio Gou

TI__Mastermind 32751 points

You understanding is correct. The GUI will only allow you to configure the TPS25750D into a 5V output capable DRP that will match the figure that you have show.

It will fully execute all of the USB PD control and configuration to execute any require role changes within the 5V source and 5-20V sink range.

+1 Fabio Gou over 4 years ago in reply to Chuck Branch

TI__Expert 4445 points

Thanks！

But in the actual power bank application, it is not convenient to use TPS25750. Because the PP5V power path requires an additional BUCK or boost connected to battery to get 5V. This function could have been realized by the charger chip to get 5V. So in the next generation of product,
I guess Its better to combine two source power paths (PP5V and PPHV).

Or is there any other consideration about the PP5V_3A source power path.

+1 Chuck Branch over 4 years ago in reply to Fabio Gou

TI__Mastermind 32751 points

Fabio,

You are correct in your assessment that the TPS25750D does require a buck to generate the pp5V.

We are addressing this in our next generation product.

Regards,

Chuck

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TPS25750: About TPS25750 power role