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LM61460-Q1: About the Auto Mode and FPWM variant,what are the difference of loop performance and transient response performance?

zhiyuan zhang
Intellectual 620 points
Part Number: LM61460-Q1

Hello expert,

    We have a project where CV buck need to provide a LED board with linear CC driver.The LED board will implement a very complex PWM dimming( many CC driver dimming but not synchronous).

    So are the three variant the same in loop performance and transient response performance?Or which one is better in my application?

  • 0
    TI__Intellectual 1940 points

    Hi Zhiyuan,

    There are 2  main distinguishers between the parts: Auto/Forced PWM and Spread Spectrum.

    The LM61460-Q1 can have two behaviors at light loads. Auto mode operation, allows for seamless transition between normal current mode operation while heavily loaded to highly efficient light load operation. The other is FPWM Mode, where frequency is maintained while lightly loaded.

    The purpose of spread spectrum is to eliminate peak emissions at specific frequencies by spreading these emissions across a wider range of frequencies rather than apart with fixed frequency operation.

    Regards,

    Rahil

  • 0 in reply to Rahil Ajani
    Intellectual 620 points

    Hello expert,

        Thank you for your information!So,what are the difference of loop performance and transient response performance about these 3 variant?

  • 0 in reply to zhiyuan zhang
    TI__Intellectual 1940 points

    Hi Zhiyuan,

    All the variants will have the same loop and transient response under the same conditions.

    Regards,

    Rahil