TPS65982-EVM: Choosing power path

Aaron Jones

Part Number: TPS65982-EVM
Other Parts Discussed in Thread: TPS65982

Hi TI,

I'm using TPS65982 in an application that requires 20V at 2A from type-C. This is a power sink that is completely powered from Type-C. If I install J6, I get 5V0 and 3V0, if I remove the PP_EXT jumper, I get no power to the board. If I install the jumper, the PP_HV power path does not close.

We’re currently running into an issue where the PP_EXT path is chosen even though we choose PP_HV as the power path (input) and disable PP_EXT. I’m trying to figure out why this is happening with little success.

I’ve verified that R10 and R11 are populated, the connection is valid. When I open J6, I do not get 3.3V, 5V, or PP_HV at 20V.

Thanks in advance!

over 8 years ago

0 Eric Beljaars over 8 years ago

TI__Mastermind 36756 points

Hi Aaron,

Can you look at the Status Register (0x1A) through the TPS6598x utilities GUI? I'm curious to see what the status of PP_EXT and PP_HV is when you are doing this test.

Thank you,
Eric

0 Aaron Jones over 8 years ago in reply to Eric Beljaars

TI__Intellectual 760 points

Every switch appears disabled, but it looks like it's successfully negotiating an active contract, what am I seeing?

0 Jacob Ontiveros over 8 years ago in reply to Aaron Jones

TI__Expert 6280 points

Hi Arron,

The sink path when in deadbattery (busppowered operation) will be the PPEXT path due to the setting of the BUSPOWERZ pin. By default it is tied to GND which closes the PPEXT path. You can make a slight HW modification to tie to LDO_1V8 to enable the PPHV path when powered from dead battery. Check the EVM schematic below.

Jacob

0 Aaron Jones over 8 years ago in reply to Jacob Ontiveros

TI__Intellectual 760 points

Hey Jacob,

I tried tying 1.8V to BUSPOWERZ and I still have 0V on PP_HV and all of my switches are disabled. Would it be possible to have a call to debug further?

0 Jacob Ontiveros over 8 years ago in reply to Aaron Jones

TI__Expert 6280 points

Hi Aaron,

Have you tried loading the the latest FW build? I would check out the project in the image below.

You can find the link to the latest tool here:

Jacob

0 Aaron Jones over 8 years ago in reply to Jacob Ontiveros

TI__Intellectual 760 points

Just to confirm,

I should select TPS65986, not the TPS65982 UFP image for the device I have selected?

0 Jacob Ontiveros over 8 years ago in reply to Aaron Jones

TI__Expert 6280 points

Hi Aaron,

Use the project i highlighted in the image above. The TPS65986 configuration can run on the TPS65982. However the TPS65982 configuration cannot run on the TPS65986.

Jacob

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TPS65982-EVM: Choosing power path