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TPS5420

Ye Xu
Prodigy 20 points
Other Parts Discussed in Thread: TPS5420, SWITCHERPRO, TINA-TI, TPS5430

Hi, I'm doing a 3.3V design with TPS5420 these days. I'm trying to understand the open loop gain of TPS5420 buck circuit. However, with limited info from datasheet, it's difficult for me to figure out a transfer function that could match well with the bode plot shown in WEBENCH. Is there any doc that could explain how to get the transfer function that could match with the bode plot in WEBENCH? That will help a lot for me to understand the stability performance of this chip. Thanks a lot.

  • 0
    TI__Intellectual 2510 points

    Dear Ye Xu,

    Please use the WEBENCH model about the TPS5420 loop response. The team did extensive overlays between simulations and measurements.

    We recommend the following source of information on  compensating Aluminum and ceramic caps for TPS5420.

    http://www.ti.com/lit/an/slva237c/slva237c.pdf

    Please do not hesitate to contact us for further questions.

    Best Regards,

    Flora

  • 0
    Prodigy 20 points
    Thanks Flora.  Question will be I need to add additional compensation network, which shall allow both ceramic and alu caps in feature. However, it’s difficult to add compensation networks in WEBENCH. Besides, I will need to understand the impact from component variations. If I could have the transfer function, I could run all the cases in Matlab that shall save me a bunch of time.
     
    Thanks.
     
    Best Regards
    XuYe
    -----------------------------------------------------------------------------------
    许晔
    Ye Xu, Sr Engineer
    gGE Inspection & Control Technologies (Shanghai) Co., LTD
    Office: (021)38772494
     
    5/F, Building 1, No. 1 Hua Tuo Rd. Zhangjiang High-tech Park
    Pudong, Shanghai, 201203, China
    -----------------------------------------------------------------------------------
     
    From: Flora Carreto [mailto:bounce-35427@e2e.ti.com]
    Sent: Saturday, January 19, 2013 12:47 AM
    To: switcherpro@e2e.ti.com
    Subject: RE: [Power and Lighting Tools Forum] TPS5420
     

    Dear Ye Xu,

    Please use the WEBENCH model about the TPS5420 loop response. The team did extensive overlays between simulations and measurements.

    We recommend the following source of information on  compensating Aluminum and ceramic caps for TPS5420.

    http://www.ti.com/lit/an/slva237c/slva237c.pdf

    Please do not hesitate to contact us for further questions.

    Best Regards,

    Flora

  • 0 in reply to Ye Xu
    TI__Genius 14455 points

    Hi Ye Xu,

           The TPS5430 has a TINA-TI average model which you can use to simulate and understand the loop characteristics of the device with various output capacitor types. TINA-TI is a free simulator which you can download from TI's website at http://www.ti.com/tool/tina-ti . As the TPS5420 and TPS5430 use the same internal compensation, you can use the same average model for the TPS5420 device as well. As the compensation is internal and proprietary to the device, we would not be able to provide the internal details of the device. Please let us know if you need further help in using the TPS5430 average model.

    Regards,

    Gerold