TPS2372: .bt PD with hitless reference design

Kuan Wei Chen (Kevin Chen)

Genius 9710 points

Part Number: TPS2372
Other Parts Discussed in Thread: PMP20859, TPS3808, , PMP21103

Dear Team,

I am looking for suitable reference design to fulfill the customer's requirement.

Even I check the below thread I still can't find the suitable reference design.

https://e2e.ti.com/support/power-management/f/196/t/733648?TPS2373-TPS2373-vs-TPS2372

Do we have one for customer?

Dual Power Supply
− 802.3bt PoE PD (E0 port) and/or 12V DC Power (Adapter: AP-AC-12V30B)
− DC power prioritized over PoE (PoE kept “alive” when powered by DC)
− Hitless failover between DC and PoE

Kevin

over 4 years ago

0 Sean Liao (Yu-Sheng) over 4 years ago

TI__Intellectual 1830 points

Hi Kevin,

Please refer to PMP20859, you just have to remove 1 of the 2 PoE channels.

http://www.ti.com/lit/ug/tidt030/tidt030.pdf

Please kindly let me know if you have additional questions, thanks!

Best Regards,

Sean Liao

0 Kuan Wei Chen (Kevin Chen) over 4 years ago in reply to Sean Liao (Yu-Sheng)

TI__Genius 9710 points

Dear Sean,

Appreciated, do we have solution without TPS3808?

If we have solution can well utilize TPS2372's pins will be better.

Kevin

0 Sean Liao (Yu-Sheng) over 4 years ago in reply to Kuan Wei Chen (Kevin Chen)

TI__Intellectual 1830 points

Hi Kevin,

If the adapter is above 48 Volt or it's on primary side, the TPS3808 must be used.

If the adapter is 12V and it's on secondary side, you can remove TPS3808 on primary side (still needs to add TPS3808 or power mux on secondary side). Please refer to PMP21103.

Please kindly let me know if the answer helps, thanks a lot!

BR,

Sean Liao

Power management

Power management forum

TPS2372: .bt PD with hitless reference design