JAJSLR9I February 2006 – May 2021 LM5009
PRODUCTION DATA
The on-time for the LM5009 is determined by the RON resistor, and is inversely proportional to the input voltage (VIN), resulting in a nearly constant frequency because VIN is varied over its range. The on-time equation is shown in Equation 4:
Select RON for a minimum on-time (at maximum VIN) greater than 250 ns, for proper current limit operation. This requirement limits the maximum frequency for each application, depending on VIN and VOUT.