SNVSB51A September 2018 – March 2019 LM5164-Q1
PRODUCTION DATA.
The on-time of the LM5164-Q1 high-side FET is determined by the RRON resistor and is inversely proportional to the input voltage, VIN. The inverse relationship with VIN results in a nearly constant frequency as VIN is varied. Calculate the on-time using Equation 11.
Determine the RRON resistor using Equation 12 to set a specific switching frequency in CCM.
Select RRON for a minimum on-time (at maximum VIN) greater than 50 ns for proper operation. In addition to this minimum on-time, the maximum frequency for this device is limited to 1 MHz.