TPS2372: does the internal mosfet pass on if a 54V power applied to the PD directly without detection, classification

xiang tao

Part Number: TPS2372

Tool/software:

hi, TI experts:

described as the question title, how does TPS2372 act if a DC 54V applied to VDD and VSS directly, the UVLO threshold is the only requirement for the internal mosfet starting on?

over 1 year ago

+1 Diang Xing over 1 year ago

TI__Mastermind 37121 points

Hi Xiang Tao,

Thanks for reaching out!

Even without detection / classification, the TPS2372's internal hotswap (MOSFET) will be turned on if its VDD-VSS is above 36.3 - 40V as the below table.

A PSE also needs to provide higher than 36.3 - 40V to turn on the internal hotswap after the detection/classification.

Best regards,

Diang

0 xiang tao over 1 year ago in reply to Diang Xing

Prodigy 100 points

Hello, Master Diang:

---on this condition,what's the status of PG,/BT,TPH,TPL。

+1 Diang Xing over 1 year ago in reply to xiang tao

TI__Mastermind 37121 points

Hi Xiang Tao,

Thanks for your reply.

TPH/TPL/BT mainly depends on the classification event number and width (BT has a wider 1st classification). If you uses a passive PoE injector (> 40V, without detection and classification), you will have classification event number = 0, and all your TPH/TPL/BT will be Hi-Z.

Best regards,

Diang

0 xiang tao over 1 year ago in reply to Diang Xing

Prodigy 100 points

thanks, I have tried this on my design, and yes like your reply. If so, it's difficult to use the TPH/TPL/BT pin to identify some non standard PSEs

Power management

Power management forum

TPS2372: does the internal mosfet pass on if a 54V power applied to the PD directly without detection, classification