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TPS65988DK: TBT4.0 only?

Part Number: TPS65988DK

Customer is now considering USB dock system which required PD3.0. I can find some explanation thread which recommended TPS65988DH instead of DK.

I'm not clear what is the different between ~DH, DK and DJ. 

- These a kind of upward compatible? When I look at D/S, D/S mentioned all device can support PD3.0.

- Why TI recommend DH?

- They cannot use DK?

Regards,

Kotaro Yamashita