TPS65982-EVM: Why TPS65982-EVM working as Source under 20V3A or 20V5A cannot work?

Hongwei Zhang1

Part Number: TPS65982-EVM
Other Parts Discussed in Thread: TPS65981EVM, TPS65982, TPS65987D

Hi,

Morning. I have a TI PD controller board of "TPS65982-EVM", when it works as Source, 5V3A and 12V3A work fine. However when it's switched to 20V3A or 20V5A, it fails, which cyclically hardreset with power negotiation with UFP device(which support 5V3A, 12V3A, 20V3A). I am not sure this kind of EVM board cannot work at 20V. Pls advise. Thanks.

Best Regards

Hongwei

over 5 years ago

0 Scott T over 5 years ago

TI__Expert 4455 points

Hi Hongwei,

Please see the note on the TPS65982-EVM product page at http://www.ti.com/tool/TPS65982-EVM.

This EVM was developed prior to the USB Power Delivery Specification change back in March 2016 and therefore does not have the native hardware to support the 5, 9, 15 and 20V rails. In order to follow the new source power rules please refer to TPS65982 Designs for Supporting Voltages in USB-PD 'Power Rules' or reference the TPS65981EVM.

The TPS65982 Device supports an internal 3A and external 5A power path. The EVM has certain limitations as noted.

You may want to consider the TPS65987D/88 family and EVMs. These devices support 5A internal power paths.

Regards,
Scott

0 Hongwei Zhang1 over 5 years ago in reply to Scott T

Prodigy 20 points

Hi Scott,

Well noted and thanks for the help!

Best Regards

Hongwei

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TPS65982-EVM: Why TPS65982-EVM working as Source under 20V3A or 20V5A cannot work?