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LMR14206 / Vin=24V, Vout=12V, Iout=0.5A, Fsw=1MHz operation

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: LMR14206

Hello,

Can LMR14206 be used at the following conditions?
Vin=24V, Vout=12V,Iout=0.5A,Fsw=1MHz.

I simulated these conditions by webench.
As a result, we can't use the LMR14206 with these conditions due to phase margine.
If I add the feedforward Capacitor to the circuite, can LMR14206 be used with these conditions?

Best Regards,
Ryuji Asaka

  • 0
    TI__Expert 3840 points

    Hi Ryuji - Your entered conditions are valid conditions so I'll forward this to the WEBENCH to make sure they take a look at the model and why it show a less than 32 deg Phase Margin.  If you take a look at the LMR14206 datasheet, one of the typical application circuits includes a 4.5V to 40V input to 12V output.  It's always a good idea to include a footprint for a feed-forward capacitor just in case it's needed or can be used to optimized the load transient response.

    Best Regards,

    -JP

  • 0 in reply to Juan Paulo Fung
    Guru 20090 points
    Hello JP san,

    Thank you for the prompt reply.
    I understood that I can use LMR14206 with the condition.
    Please let me know you got the feedback from Webench team.

    Best Regards,
    Ryuji Asaka
  • 0 in reply to Ryuji
    TI__Intellectual 1825 points

    Hello,

    As JP mentioned, your inputs are valid conditions for LMR14206.  We recently found a bug in our model that was causing the Phase Margin of the design to go outside the allowable range for stability.  We are in the process of fixing this, and it should be resolved within the next day or two.  Try to re-create your design in WEBENCH later this week, and WEBENCH should bring up the LMR14206 design for you.

    If you have any other questions or concerns, please let me know.

    Regards,
    Jonathan Arzadon
    Applications Engineer
    WEBENCH Design Center
    Texas Instruments