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TPS2373: Using it to power a non isolated synchronous BUCK converter

Part Number: TPS2373
Other Parts Discussed in Thread: TPS2372, TPS23880, TPS2388

Hi,

In the datasheet it is seen that i need to give Vc_In (8.5V <Vc_in<15V) to the IC for proper operation.

So, if i am powering a non isolated synchronous Buck converter, should i design an extra circuit to give this bias voltage and regulate it to the said voltage?

Kindly shred some light on the circuit configuration when using TPS2373 with a buck converter.

Thanks 

Arjun

  • Hello Arjun,

    We are slightly short handed at the moment, but I will attempt to find an answer soon.

    Thanks,

    Thomas A.

  • i have the exact same question..   I have a 5V buck regulator,  and i dont' need to provide any external aux supply to it, ( it will look after itself )..  

    Looking at the datasheet, its lookign like you wont' need to worry about it.

  • Hi Arjun and Andrew,

    The TPS2373 was design to be used with the advanced startup so VCIN should be biased. You can use a zener to regulate 12V from the 48V rail.

    However, we just preview-released the TPS2372. This is a .bt IC without advanced startup (VCIN bias). This would be ideal for a buck converter topology.

    Please below links:
    www.ti.com/.../TPS2372
    www.ti.com/.../TPS2372-4EVM-006
  • What would happen if you did not connect Vin.. From the diagram in the data sheet this only seems to be used for providing power to a down stream DC/DC controller?  In the absense of any info prior to this, i actually sent a board away for manufacture.. 

  • Just been looking at the datasheets for both these IC's and it seems that the pin outs are almost the same. In fact i think for my applicaiton i'll be able to just drop it in. I've just ordered prototypes. Glad this IC has been released though..

    ANy new on PSE devices yet?
  • Andrew,

    I am happy to see that you are working with our new IEEE802.3bt-ready ICs and they seem to be working well for you.  Our Application Engineer will reply to your previous question (2 threads up) shortly.

    To your latest question, we are currently working to validate first silicon of our planned IEEE802.3bt-ready PSE.  It will be called the TPS23880.

    While waiting for it to start sampling (and have an EVM) on ti.com, we are recommending that customers become familiar with our TPS2388 which is released and available for .at applications.  The register map and pinout are similar and will provide a good path to .bt compliance for you.

    Best Regards,

    Thomas Lewis

    PoE Applications & Marketing Manager

  • Hi Andrew,

    I apologize for the delayed reply. Without a VCIN bias, the advanced startup will cycle. This will create an overall inefficient system. In addition, auto MPS will be disabled unless VCIN is above it's threshold.

    Regards,
    Darwin