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

keita.shoji

Part Number: TPS552892

Hi. Is it possible to connect external 12V power supply at the VOUT pin when VIN=0V and EN=OFF. VIN and External 12V will not be applied simultaneously. I would like to know if there are any concerns.

Best regards.

over 2 years ago

0 Bryce Xun over 2 years ago

TI__Mastermind 24320 points

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

0 keita.shoji over 2 years ago in reply to Bryce Xun

Prodigy 210 points

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,

0 Bryce Xun over 2 years ago in reply to keita.shoji

TI__Mastermind 24320 points

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

0 keita.shoji over 2 years ago in reply to Bryce Xun

Prodigy 210 points

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

+1 Bryce Xun over 2 years ago in reply to keita.shoji

TI__Mastermind 24320 points

Hi Keita,

Thanks for feedback, it is ok with that.

Regards,

Bryce

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