TPS65987D: TPS65987D dynamic adaption of output power during runtime

Dirk R

Prodigy 30 points

Part Number: TPS65987D

Hello,

is it possible to dynamically regulate output power for USB PD during runtime by the I2C interface?

I would like to measure the internal adapter temperature and reduce the output power if over-temperature is detected.

The degradation could be to reached to switch for example from 20V-3A to 5V-3A output.

Another approach could be to adapt the firmware of the TPS65987D to directly measure a NTC voltage by an ADC input without host controller and manage power degradation internally.

Is this generally possible or do you see any other way to adapt the output power depending on internal temperature measurement?

Thank you for your support

over 5 years ago

0 Adam Mc Gaffin over 5 years ago

TI__Mastermind 30000 points

Hello Dirk,

Yes, this could be done with the TPS65987D, and you can do it through the use of two GPIO's. You will use the App Config functionality which is used in the following reference design, and mentioned within section 3.2 of the following app note

http://www.ti.com/tool/TIDA-050012

http://www.ti.com/lit/an/slvae11/slvae11.pdf

In short, you will create two different configurations using the Application Configuration GUI. Whenever the charger enters into an over current event, have this toggle a GPIO On the TPS65987D where a 5V/3A configuration is loaded. Once the over current event is no longer present, load the original configuration with 20V/3A. Within the GUI, you can load the project file used for the reference design listed above.

http://www.ti.com/tool/TPS6598X-CONFIG

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TPS65987D: TPS65987D dynamic adaption of output power during runtime