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TPS23753A: Increasing Converter UVLO

Benjamin Bawkon

Expert 1100 points

Part Number: TPS23753A

Good day,

I have an application using the TPS23753A. This particular design included the ability to power the circuit using an auxiliary adapter in "Option 1" mode - in this case an 18-24V auxiliary input.

I need to increase the UVLO voltage of the converter so that it locks out with an input less than ~15V.

I've considered two options to implement this, the first being a second MOSFET in series with the switching FET enabled by a voltage monitoring circuit. The second, and certainly simpler option is a 6V Zener in series with the TPS23753A VDD1 input.

Does TI have any suggestions for a modified UVLO Converter voltage with the TPS23753A, or could you provide any comments on the two solutions I'm proposing?

Thank You,
Ben

over 5 years ago

0 Michael Pahl over 5 years ago

TI__Mastermind 21320 points

Hello Ben,

I would suggest doing option 2, and having the adapter reference RTN instead of VSS.

I don't think you need to change the UVLO. We have parts where it is programmable, but I think for your solution you can use the APD and its divider.

We have multiple reference designs with low input voltages:https://www.ti.com/power-management/power-over-ethernet-poe/powered-devices/reference-designs.html#search?famid=664&vinmin=4.5,30

I copied one here that uses the TPS23753A: https://www.ti.com/lit/df/slvran5/slvran5.pdf?ts=1594666125726&ref_url=https%253A%252F%252Fwww.ti.com%252Fpower-management%252Fpower-over-ethernet-poe%252Fpowered-devices%252Freference-designs.html

Would this work for you?

If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

Regards,

Michael P.

Applications Engineer

Texas Instruments