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Original question:

LM2674: LM2674

LM2674: 5k R1 limit

RJ
Intellectual 2550 points
Part Number: LM2674

Hey Team,

On the datasheet R1 can be between 1k-5k. What is the reasoning behind this threshold? I have seen a design that uses over 5k on the schematic -  would that cause any issues?

Regards,

Ramon

  • 0
    TI__Mastermind 25590 points

    Ramon,

    Feedback resistor values are a tradeoff between power dissipation and noise immunity. Lower values give better noise immunity but more power dissipation, and vice versa. This device is >20 years old meaning efficiency wasn't as good as it is today (meaning more power in the resistors makes less of a relative impact), the device is relatively noisy (larger package and less of the noise improvements we have today), and it may be more sensitive to noise. 5k is probably a conservative estimate but I recommend following the datasheet guidelines or using a different part.

    -Sam