SNVA406C May   2010  – January 2022 LM27402

 

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9.12 Rfb1 and Rfb2

The resistors labeled Rfb1 and Rfb2 create a voltage divider from VOUT to FB and FB to GND that is used to set the nominal output voltage of the regulator. Nominally, the output of the LM27402 evaluation board is set to 1.5 V using resistor values of Rfb1 = 20.0 kΩ and Rfb2 = 13.3 kΩ. If a different output voltage is required, the value of Rfb2 can be adjusted according to the equation:

Equation 15. GUID-EA1A44EE-E127-4B9C-863C-90EB39962E3B-low.gif

Rfb1 does not need to be changed from its value of 20.0 kΩ.