SLVS181J December 1998 – September 2019 TPS763
Resistors R1 and R2 must be chosen for approximately 7-µA divider current. Lower value resistors can be used but offer no inherent advantage and waste more power. Higher values must be avoided as leakage currents at FB increase the output voltage error. TI recommends choosing a design procedure of R2 = 169 kΩ to set the divider current at 7 µA and then calculate R1 using Equation 2.