SNVS124F November 1999 – April 2021 LM2596
Select R1 and R2, as shown in Table 9-6
Use Equation 1 to select the appropriate resistor values.
Select a value for R1 between 240 Ω and 1.5 kΩ. The lower resistor values minimize noise pickup in the sensitive feedback pin. (For the lowest temperature coefficient and the best stability with time, use 1% metal film resistors.). Calculate R2 with Equation 2.
Select R1 to be 1 kΩ, 1%. Solve for R2 in Equation 3.
R2 = 1 k (16.26 − 1) = 15.26 k, closest 1% value is 15.4 kΩ.
R2 = 15.4 kΩ.