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LM63615-Q1: Is it okay to use a resistor constant other than 100 kΩ for feedback?(LM63615 and LM63625)

Toshimitsu Togashi
Prodigy 90 points
Part Number: LM63615-Q1

Hi support team,

According to the data sheet, "100 kohm is recommended for the feed back resistor constant (FBT)  that determines Vout."

However, we want to use a resistor of 100 kΩ or less.

What is the range of resistance values that can be used?

Thanks.

Regards,

Toshimitsu

  • +1
    TI__Expert 4040 points

    Hi Toshimitsu,

    Yes, you can use a resistor of 100kohm or less(large than 10kohm). Usually RFBT is between 10kohm and 1Mohm. Smaller values of resistance reduce noise sensitivity, but also reduce the light-load efficiency. The recommended value for RFBT is 100 kΩ with a maximum value of 1 MΩ. If 1 MΩ is selected for RFBT, then a feedforward capacitor must be used across this resistor to provide adequate loop phase margin (see Section 9.2.2.2.1). I answered this question in another post of yours. You can also find the answer to this question in the datasheet. Thanks.

    Aurora