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LM5046 & UC1844A

Anthony Perry
Prodigy 60 points
Other Parts Discussed in Thread: LM5046, UC1844A, AMC1210, ADS1205, SM320F28335-HT, TMS320F2808

Dear Sir,

I have a number of questions,  relating to different power devices & topologies.  Firstly,  I note that you have a 'one eighth'  brick design using the LM5046 devices.  I see no clarifiaction of a part number for T1 in that design,  or any other documentation.  Do you have that information available?  (Application Note 2126 LM5046 Based Eighth Brick Reference Design)

Also,  I have another requirement for a high voltage,  high temperature solution.  The device UC1844A looks very interesting,  but unfortunately is not available in a high temperature version. 

Can someone advise me who would be the best application engineer/ 'guru' to speak to at Ti,  in relation to these & other devices?

Regards

Tony Perry

  • 0
    TI__Guru* 93735 points

    Tony,

    I can't speak to the UC1844A, but I looked into the LM5046 application note. I checked with the applications engineer about this board. Here, the core was purchased, but the windings are integrated into the PCB. The core that was used is the EQ20/R-3F35+PLT20 by Ferroxcube.

    In the link below, you can find the Data Handbook Soft Ferrites and Accessories under the Applications Info tab. Please refer to Page 478,

    http://www.ferroxcube.com/

    If you look in the app note, you can see the windings that are coiled up in the layers of the PCB. Check out pages 8-11 of the note.

    http://www.ti.com/lit/an/snva474a/snva474a.pdf

     

    Joseph Wu

  • 0 in reply to Joseph Wu
    Prodigy 60 points

    From:  Tony Perry

    Hi Joseph,

                       thank you very much for your answer.  Very informative. One last question,  relating to thermal analysis software.  Obviously these power devices need thermal modelling.  Is there any software available from Ti to complete this task?  I had heard that Webench or Power Designer software was currently being worked on.  In the short/medium term,  is there any existing or new software from Ti that is available,  to complete this task?

    Regards

    Tony Perry 

  • 0 in reply to Anthony Perry
    TI__Guru* 93735 points

    Tony,

    I know there are some basic thermal simulations that can be found on WEBENCH, but it's only on a very limited basis (very few parts). Usually these models are constructed from measurements of an existing evaluation board and the layout is set as shown in the simulation. In WEBENCH, you can see the parts with thermal models by looking for the thermometer icon under the WEBENCH tools column.

    I know of one case where DELPHI-based compact thermal models were created but we typically don't have the in-house expertise to generate or use these models.

    In short, I'm not aware of any existing software that TI has to do thermal simulations except the limited offerings seen on WEBENCH.The link below is the page on Thermal Analysis in the WEBENCH page; it may have some more information on the topic.

    http://www.ti.com/adc/docs/midlevel.tsp?contentId=105986

    Joseph Wu

  • 0 in reply to Joseph Wu
    Prodigy 60 points

    From:  Tony Perry

    Hi Joseph,

    Thanks for the info.  I have one more problem.  I need a high temperature 'resolver-to-digital'  solution.  I wasn't quite sure who to contact.  I note that Ti have the AMC1210 & the ADS1205 devices.  Do any of these operate at 200 degC?  If you do have a high temperature solution,  do you supply 'die'  on these parts,  for hybrid MCM designs?

    Regards

    Tony Perry

  • 0 in reply to Anthony Perry
    Prodigy 60 points

    From:  Tony Perry

    Hi Joseph,

    Over the weekend,  I have realised that there is an applications note available for a micro-controller development of a resolver (applications note number: SPRA605). This involves the use of a TMS320F240 DSP device.  I do have an option to use the SM320F28335-HT,  which can be operated above 200 degC & is available in die form. I need both for this application.

    I also note on page 12 of this application note,  references are made to 'source modules'  for this design.  Are these available to someone that wants to start a new design?  Also,  I need to understand how closely the architecture of the SM320F28335-HT align's with the TMS320F240 DSP part, which is shown in your applications note.

    I guess this enquiry now needs to be forwarded to the Microprocessor section of your applications support,  for an answer.  Can you do that for me please?

    Regards

    Tony Perry

  • 0 in reply to Anthony Perry
    TI__Guru* 93735 points

    Tony,

    It's probably easier for you to re-post this question in to the proper forum, so cut and paste your question into the following forum:

    http://e2e.ti.com/support/data_converters/precision_data_converters/default.aspx

    In the meantime, I don't know of a good 200C solution, but I think I know who to ask and I'll post an answer there (if the apps engineers in precision converters don't get to this question first).

    Joseph Wu

  • 0 in reply to Anthony Perry
    TI__Guru* 93735 points

    Tony,

    For the microprocessor question, you can cut, paste, and post them here:

    http://e2e.ti.com/support/microcontrollers/default.aspx

    I'd note that it looks like the TMS320F240 is being discontinued and that new designs should use the TMS320F2808. On this one, I don't know anyone in microcontrollers and it would be best for them to answer this directly.

    Joseph Wu