SNVSB14C April 2018 – October 2021 LM5036
PRODUCTION DATA
Use Equation 31 to calculate the value of RON required to achieve the desired switching frequency for the auxiliary supply. Make sure that the calculated RON value is greater than the minimum value required by Equation 40. For this design example where on-state VAUX1 is 8.5-V and target fSW_AUX is 500-kHz, the calculated value of RON is 189-kΩ. The minimum recommended value calculated using Equation 40 is 209-kΩ. A standard value of 220-kΩ is selected to satisfy this minimum RON requirement giving and actual switching frequency (fSW_AUX) of 430-kHz.