TPS552892: Connecting external power supply at VOUT pin when VIN=0V

Hi Keita,

May I know what is the product type and application here?

It's ok with external 12V at Vout when EN=0, the device is shutdown.

Regards,
Bryce

Hi Bryce,

Thanks for the answer. We are designing a power supply with two inputs for industrial application, one for unregulated 12-24V input, the other is for regulated 12V (external 12V in the above diagram).

Best regards,

Hi Keita,

Thanks for feedback. Understood, so the 12V-24V input to TPS552892 is something like backup power supply? Only when external 12V supply is not valid, then TPS552892 can be enabled; if external 12V is already, then TPS552892 is disabled, right? 

Regards,
Bryce

We are currently not considering this as a backup power supply. This is more like an optional feature to power from unregulated power supply.