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TPS61165: Simulation platforms

Attila Varhelyi
Intellectual 615 points
Part Number: TPS61165
Other Parts Discussed in Thread: TINA-TI

I would like to calculate efficiency factor, power dissipation and thermal analysis in different topologies like BOOST and SEPIC.
The application is LED backlighting.

Where can I find, which simulation tools support given SMPS IC?

Which simulation platform do you recommend for this application?

I have ran the online WEBENCH Power Designer, but e.g. TPS61165 and similar SMPS ICs are not supported ("Hmm we found TPS61165 but it is not supported in this tool").

WEBENCH support the TPS61170DRVR, but it is not possible to simulate SEPIC topology, which is supported by this device.

Note: WEBENCH simulation results are very interesting, because of  total dissipation (Pd) is not equal with sum of componenst dissipation values, e.g. Total Pd 223.847 mW, where Cout Pd 25.356 μW, Diode Pd 58.305 mW, IC Pd 125.1 mW, L Pd 60.045 mW. Maybe this is bug in this calculator, so calculated efficiency value  maybe not correct after this. My WEBENCH® Design is TPS61170DRVR REGIST.

Others (TINA-TI, PSPICE for TI) were not installed yet.

As I know, PSPICE supports more components in its internal libs.

I would like to evaluate/simulate other SMPS driver IC too.

Attila

  • 0
    TI__Genius 13001 points

    Hi,

    TPS61165 has its PSpice model. It's recommended that you install the PSpice for TI 2020 and search the TPS61165 reference design to simulate. 

    BR,

    Robin

  • 0 in reply to Yuting Shao
    Intellectual 615 points

    Hi Robin,

     

    After PSpice fro TI 2020 installing, I don’t find the SEPIC PMP10835 reference design, which is here:

    PMP10835 LED Driver SEPIC Converter (9.9V@0.24A) Reference Design | TI.com

     

    you wrote: „search the TPS61165 reference design to simulate”

    What do you mean under TPS61165 reference design?

    I have found one boost reference with TPS61165, nothing about else.

     

    Others:

    What kind of restrictions are exist in this free editions?

    Please inform me about these points:

     

    1. Does not TPS61165 model support thermal analysis?

     

    What I see it when I open the boost reference design:

    "operating current and shuthdown current have not been modeled"

    "Thermal characteristics of the part have not been modelled"

    Without them it is not possible to do correct simulation process.

     

    1. It is not possible to measure RMS on given signals?

     

    I don’t find RMS measuring. When I want to use RMS() function then I get error.

     "Invalid expressoin RMS(I(L1:1))"

     

    When I want to use an external MATLAB function, then I get this warning message: „This license does not enable to using MATLAB functions”

    "PSpice System License is not available - it is required for using MATLAB function"

    I don't have any ideas, that I could calculate the RMS values in this simulation.

    I can plot U*I functions, but I can not determine the rms of these signals. e.g. P=I(U1:SW)*V(U1:SW). The consuction loss of IC and the swithing loss of IC together give the main part of U1 dissipation power.

     

    FYI: my target is the calculate the power efficiency, the dissipation power of IC, L and D, and predict the thermal temperature of these parts in SEPIC topology. We could appreciate any help to find the suitable way.

    Attila

  • 0 in reply to Attila Varhelyi
    TI__Genius 13001 points

    Hi Attila,

    Sorry, this model doesn't support thermal simulation. 

    You can use PSpice official version for further analysis.

    BR,

    Robin

  • 0 in reply to Yuting Shao
    Intellectual 615 points

    Hi,

    This is very interesting response, because the original question was this: "I would like to calculate efficiency factor, power dissipation and thermal analysis in different topologies like BOOST and SEPIC." You have recommended this software. I have spent a lot of time to evaluate PSpice, but I am hesitating about usability now.

    But outside of thermal simulation, I had more questions (take a look above). Please give me response for them (step by step). I would like to know the restrictions of free version. At this moment I can not determinate, what is PSpice restriction and, what comes from my missing skills.

    Question lists:

    What do you mean under TPS61165 reference design?

    Is it possible to measure RMS on given signals?

    Does TPS61165 modell ready for SEPIC topology?

    Please confirm that PSpice free version (w/ TPS61165 modell) is ready to work with SEPIC topology. I am confused when I read this thread: 

    (7) [Resolved] TPS61165: SEPIC configuration - how to calculate power dissipation and output voltage limits? - Power management forum - Power management - TI E2E support forums

    "TPS61165 PSpice model may or may not have been optimized for SEPIC operation. My attempts to simulate the circuit showed unstable results. The use of PSpice is a good verification of a mathematical approach. If used as the solely tool for determining the circuit it becomes a lengthy trial and error effort."

    Attila