SLUSCC7C July 2016 – June 2018 TPS546C23
There is a tradeoff between higher and lower switching frequencies for buck converters. Higher switching frequencies may produce smaller solution size using lower valued inductors and smaller output capacitors compared to a power supply that switches at a lower frequency. However, the higher switching frequency causes extra switching losses, which decrease efficiency and impact thermal performance. In this design, a moderate switching frequency of 300 kHz achieves both a small solution size and a high-efficiency operation. With the frequency selected, use Equation 15 to calculate the timing resistor (RT). The standard value of 68.1 kΩ is used in the design.