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LM43603PWPEVM: LM43603 Feedback Resitor

TAEIL KIM
Prodigy 30 points

Part Number: LM43603PWPEVM

Hi　Team。 

The explanation on DATASheet is as follows.

RFBT in the range from 10 kΩ to 100 kΩ is recommended formost applications.

But, The sample circuit in the datasheet is 1 MΩ.

Is there any problem even if the top feedback resistance is 1MΩ?
Best Regard.
  • 0
    TI__Genius 11040 points
    Hi,

    When increasing the feedback resistance, the current draw on the input decreases. However, the FB node is more susceptible to noise since the current decreases. The layout of the FB resistors should be directly next to the IC, and the trace should be routed away from the switch n ode.

    Please let me know if you have any additional questions.

    Best Regards,
    Katelyn