SNVSBY6 October 2021 LM61430-Q1
A feedback resistor divider network between the output voltage and the FB pin is used to set output voltage level. See Figure 8-10.
The LM61430-Q1 uses a 1-V reference voltage for the feedback (FB) pin. The FB pin voltage is regulated by the internal controller to be the same as the reference voltage. The output voltage level is then set by the ratio of the resistor divider. Equation 3 can be used to determine RFBB for a desired output voltage and a given RFBT. Usually RFBT is between 10 kΩ and 1 MΩ. 100 kΩ is recommended for RFBT for improved noise immunity compared to 1 MΩ and reduced current consumption compared to lower resistance values.
In addition, a feedforward capacitor, CFF, connected in parallel with RFBT can be required to optimize the transient response.