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PoE
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  • Forum Post: Re: PoE max & PoE fault issue

    AKV
    Hi Martin 1.When I connected the faulty board to passive PoE injector it is drawing around 0.16A current where as a working board draws around 0.01A only 2.The same design is working fine in 85 boards where as 7 boards only have this issue 3.We made an observation in faulty board that, we are...
    on Jun 3, 2010

  • Forum Post: PMP5881 availability

    William Crawford
    Hi. Can you tell me if an EVB and/or design files are available for PMP5881 Rev B? Thanks...
    on Apr 1, 2011

  • Forum Post: Re: TI chip tps23756 POE issue

    Ronak Shah
    Hi Eric, Yes, I am sure that DSO probe is not completing 54V circuit. I am using MIT-09-56D PSE. I have captured waveform,when th e proper phase sequence occurred.(on connecting probe.) Pl. observe the wave. X-axis: 20V/Div, Y-axis: 100ms/Div Peak = 59V Regards, RNK.
    on May 16, 2011

  • Forum Post: Re: TI chip tps23756 POE issue

    Ronak Shah
    Hi Eric, I have also observed 25 ripples (range: 10.8V to 20.0V) before PD gets 59V. Are those ripples class and mark? And before those 25 ripples, there is some signal ranging from 7.60V to 10.00V (which is attached in next post). Pl. observe the other wave. X-axis: 20V/Div, Y-axis: 20ms/Div...
    on May 16, 2011

  • Forum Post: Does 4-pair PSE (two) work for 2-pair (PD)

    veera venkateswara rao pusala
    Hi, I am designing the 4-pair Mid-span, can you tell me what happens when we connect 2-pair PD to the 4-pair PSE? (Assume each PSE supports 40W, 2-pair PD requires 5oW) Regards, Venkat
    on Jun 17, 2011

  • Forum Post: High power PSE design(77W) using two PSE

    veera venkateswara rao pusala
    Hi, I am going to develop 4-pair high power PSE (two PSE chips) by using PD69101 chips, but the reference design is not available for that IC. I want to use similar Texas Instruments IC for my application. please suggest me and find the attachment of 4-pair configuration of PD69101 chip. ...
    on Jun 15, 2011

  • Forum Post: 55W Mid-span PSE Controller (LEGACY Applications)

    veera venkateswara rao pusala
    Hi, I have LEGACY PD of 55W, i want to supply the power to that PD. please suggest me which PSE suitable for my application Regards, Venkat
    on Jun 20, 2011

  • Forum Post: Re: PoE++ PD controller

    veera venkateswara rao pusala
    Hi, thanks for reply. above specified power level 95W is belongs to 4- pairs, it can support 45W power over 2-pairs. my question is how much maximum power TI PD can support during LEGACY mode? Regards, Venkat
    on Jun 24, 2011

  • Forum Post: PoE++ PD controller

    veera venkateswara rao pusala
    Hi, I have PoE++ Mid-span PSE controller , which contains LTC4274A-4 PSE controller. for that i am going to design the PD controller which support 90W power. please suggest me which TI chip is suitable for my application Regards, Veera (Please visit the site to view this file)
    on Jun 23, 2011

  • Forum Post: 50W PSE controller

    veera venkateswara rao pusala
    Hi, I need 50W PSE controller for my application......can you send me reference design if any available?
    on Jun 29, 2011

  • Forum Post: PoE max & PoE fault issue

    AKV
    Hi I am using a PoE circuit with TI's PD controller "TPS23753PW". When this circuit is connected to an active PoE switch, switch shows "PoE max" & "PoE fault" indications & there is no PoE output voltage.Power LED is blinking with OFF period is more than ON...
    on May 28, 2010

  • Forum Post: Low Profile Transformer Recommendation for 13W PoE Application with TPS23753?

    David Hildebrand
    Is anyone aware of low profile transformer options for a 13W 802.3af PoE application? We recommend a Coilcraft POE13P-50L for use with the TPS23753 but it is too tall for this particular application. The need is for a PoE transformer that has less than a 9mm height but can support 13W. Thanks,...
    on Dec 15, 2011

  • Forum Post: tps23851 EVM issue

    Hank Lu
    I see tps23851 EVM.This EVM have MSP430F2012 in BOM. But I did not find any source code for this EVM. Could you kindly help me to get it.
    on Feb 6, 2012

  • Forum Post: HPA108 Evaluation Board(TPS23750): Reduce the output current

    Quentin Henneaux
    Hello, In the user guide for the evaluation board HPA108, we can find a typical circuit for an output of 3.3V and a current of 2A, the efficiency of this circuit is 80% I want to keep the output voltage but lower current to 0.2A while maintaining an efficiency of 80%. I think the solution would be to...
    on Feb 21, 2012

  • Forum Post: About TPS23753A Simulation Tool like a WEBENCH

    March Jasper
    Hi Now I have question for TPS23753A for POE device. But Can possible simulation for TPS23753A like a WEBENCH? Beacause of this POE series device little diffucult for design without familiar people. If do u have idea please tell us about simulation Tool ? * I think , can possible POE device...
    on Mar 1, 2012

  • Forum Post: About TPS2379 compatibility

    Adrian Chen
    Hi, Is TPS2379 compatible with Cisco UPOE? Thanks and Regards
    on Apr 6, 2012

  • Forum Post: Re: About TPS2379EVM-106 design

    Adrian Chen
    Hi,Eric Excuse me I may not have my question described clearly... Can I double chk again, for comply with 60w over 4 pairs UPoE Cisco switch in hardware circuit , we need two TPS2379 chip + dcdc, or one TPS2379 chip + dcdc, and why? Thanks.
    on Apr 9, 2012

  • Forum Post: About TPS2379EVM-106 design

    Adrian Chen
    Hi, Is TPS2379EVM-106 designed to comply with Cisco UPOE PSE? Since it is my customer ask for it. Thanks and Regards
    on Apr 9, 2012

  • Forum Post: TPS23756 Hotswap MOSFET not blocking Auxiliary Voltage

    Michail Klimkovic
    Hi, I am evaluating TPS23756EVM for my future design. When I power the board with only Auxiliary power (e.g 24V, no cable in the RJ45 jack), there still appears voltage between VDD and VSS. The jumper configuration is as follows: J9 - PPD1 (PPD is pulled down to VSS by 5k49 resistor) J10...
    on Apr 14, 2012

  • Forum Post: About PoE Device TPS2375 Power Good Pin Status

    March Jasper
    Hi. I have question for PoE TPS2375. This device has Power Good ( =PG ) Pin for exterla status. But Our system ,sometime PG status became to Low . I think this is PG pin status reson by data sheet. 1) In rush Current 2) UVLO 3) Current Limit 4) Thermal Protection I think these reason...
    on Jun 6, 2012

  • Forum Post: Looking for TPS2375x OrCAD POE PD reference design files

    Ron Kieley
    Hi, I'm looking for OrCAD (or other tool) source files for an isolated POE PD design with 5V or 3.3V 2A output using one of the TI TPS2375x chips. I could not find the files in any of the reference designs on ti.com. Maybe it's in part of another reference design for a VoIP phone or something...
    on Jul 12, 2012

  • Forum Post: RE: TPS23754 with 24V output

    Gary Poon
    I took reference to the TPS23754EVM-420 and built a test board, but it is not working, please check the attached schematic of my testing board. Could you help to check what is the problem? The PoE should be able to connect with both 802.3af and 802.3at PoE source (when conect to 802.3af the output...
    on Aug 20, 2012

  • Forum Post: TPS23754 in flyback mode for 1 Gig POE+ application

    Arunkumar PB
    Hi, We are planning to use TPS23754 in synchronous flyback mode for 1 Gig POE+ application. In TPS23754EVM-420 ref schematic ,the ethernet interface is not for 1Gig but TPS23754EVM-383 for active clamp forward converter the ethernet interface is for 1Gig. I want to know if we can use the TPS23754...
    on Nov 10, 2012

  • Forum Post: Qestions on TPS23754 Application

    Grant Wang
    In TPS23754 spec, maximum input operation voltage is 57V, absolute maximum rating is 100V. Is it OK for 72V input supply to be applied? For 802.3at compliant, TPS23754 is designed for <30W output due to PoE power classification. Is it possible to skip PD classification and output 30W~35W power...
    on Nov 28, 2012

  • Forum Post: TPS2376-H versus TPS2378

    David Escandon
    TI Team, I was wondering if I could get your opinion on the following. I currently have the TPS2376-H designed into my circuit using the evaluation board reference design. I've added ORing diodes to my design, and have bypassed the DC/DC converter portion of the evaluation. My question is about...
    on Jan 25, 2013
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