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TI Home » TI E2E Community » Support Forums » Development Tools » WEBENCH® Design Center » Simulation and Models Forum » TPS53355 in Switcherpro with 850kHz
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TPS53355 in Switcherpro with 850kHz

This question is answered
Andreas Doering
Posted by Andreas Doering
on Feb 15 2012 08:35 AM
Prodigy20 points

I want to simulate a design with TPS53355 with high switching frequency.

The switching frequency is controlled by a resistor from pin "RF" to either ground or VREG.

In the design in SwitcherPro (v3.17.0.0 downloaded today) there is only one resistor to ground.

Hence, no frequencies larger than 500KHz can be simulated.

Is that right, or do I miss a way in which I can add a resistor between "RF" and VREG?

Andreas

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  • Nancy Zhang (CPM)
    Posted by Nancy Zhang (CPM)
    on Feb 15 2012 08:52 AM
    Mastermind26830 points

    Hi Andreas,

    Yes, you are right. SwitcherPro only can simulate the typical application which is switching frequency is below 500kHz. This is the SwitcherPro limitation. I don't think you can add a resistor from RF pin to VREG pin in current SwitcherPro program. You could order a TPS53355EVM or use the spreadsheet as attached to verify the performance of 850kHz.

    2045.TPS53355_DESIGNE_TOOLEVMdesign.xls

    Thanks,

    Nancy

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  • Nikhil Gupta - WEBENCH Design Center
    Posted by Nikhil Gupta - WEBENCH Design Center
    on Feb 15 2012 10:37 AM
    Verified Answer
    Verified by Britt Brooks - WEBENCH® Design Center
    Genius9990 points

    Hi Andreas,

    You can actually change the frequency of operation if you enter the specifications through the "Advanced Inputs" tab. There is a column for the operating frequency desired. I am attaching an example below which is operating at 700KHz.

    Best regards,

    Nikhil

    Nikhil Gupta

    Power Modeling Engineer

    WEBENCH Design Center

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