TPS23756: 8VDC input required

Jason C42

Part Number: TPS23756
Other Parts Discussed in Thread: TPS23750, TPS23770, TPS2378,

Hello,

I have a 8 VDC input PoE ( 802.3at PD ) power controller required ( Flyback ), Did the TI have any suitable part? thank.

Thank for your kindly support

Jason C

over 6 years ago

0 Thomas Lewis over 6 years ago

TI__Expert 5615 points

Hello Jason. Thank you for your interest in PoE products from Texas Instruments.

What power level are you trying to achieve? We do have two Type 1 (Class 3) limited parts - TPS23750 and TPS23770 - which have a 0V minimum VIN spec and an integrated DC/DC PWM.

Beyond those parts (if needing Type 2/Class 4 power for example), you could select one of our stand-alone PD controllers (like the TPS2378) and then partner with any DC/DC PWM of your choice.

If wanting to see all the parameters, for all our PD devices, in one, easy-to-review table, I suggest you check out our parametric tree here --> www.ti.com/.../products.html

Best Regards,

0 Jason C42 over 6 years ago in reply to Thomas Lewis

Prodigy 90 points

Hi Thomas,
Sorry for my reply late. Thank for your recommend.
Can I modify the "slvu329a" application to output 12V ? I need to change which component to output 12V /2.2A.

0 Jason C42 over 6 years ago in reply to Thomas Lewis

Prodigy 90 points

Hi Thomas,
I have found the coilcraft JA4667-AL can support input 10~57V / Output 12V/2A with TPS23756( slvu329a), could you help provide the application schematic . Thank

0 Thomas Lewis over 6 years ago in reply to Jason C42

TI__Expert 5615 points

Jason, I am going to refer this on to our PoE PD Application Engineer, Darwin Fernandez.

He will be able to assist you further.

Best Regards,

0 Jason C42 over 6 years ago in reply to Thomas Lewis

Prodigy 90 points

Hi Thomas,

Thank you and Darwin.

Thank for your kindly support

Jason

0 Darwin Fernandez over 6 years ago in reply to Jason C42

TI__Mastermind 40120 points

Hi Jason,

Is the min input voltage range you're looking for at 8V? or 10V or 12V?

Typically for a 12V output (of the PoE converter), a 10-12V adapter is OR'd with the output of the converter. From a design perspective, it makes it more efficient because the adapter directly powers the load.

If 8V, the voltage is too low to power the TPS23756. As Thomas, suggested, the TPS2378 should be used and paired with a converter that can handle the 8V-57V wide input.

I recommend looing for a DCDC converter in our TI design reference design library in the link below to find a power solution for your power requirements.

www.ti.com/.../refdesignsearchresults.tsp

0 Thomas Lewis over 6 years ago in reply to Darwin Fernandez

TI__Expert 5615 points

Jason,

I wanted to check in with this thread as we have heard back from you in some time. Please let us know if there is anything else we can do to assist...otherwise, we are going to assume this thread is resolved.

Thank you for your interest in PoE products from TI,

0 Jason C42 over 6 years ago in reply to Darwin Fernandez

Prodigy 90 points

Hi Darwin,

Sorry for my reply your message late. As below is my design for TPS23756 AUX input, the "J5" will input 10.8 ~ 13.2VDC and 24 VAC, so we can't Oring the aux source to output.

Now I already change the output is 5V to solve the problem, but if you have good suggest pls. let me know.

Thank for your kindly support