SNOSB23F October 2008 – July 2019 LM5575-Q1
PRODUCTION DATA.
RT sets the oscillator switching frequency. Generally, higher-frequency applications are smaller but have higher losses. Operation at 300 kHz was selected for this example as a reasonable compromise for both small size and high efficiency. The value of RT for 300-kHz switching frequency can be calculated as Equation 7.
The nearest standard value of 21 kΩ was chosen for RT.