SNVSAJ3B March 2016 – February 2017 LM5165-Q1
The LM5165-Q1 is designed to operate from an input voltage supply range between 3 V and 65 V. This input supply should be able to provide the maximum input current and maintain a voltage above 3 V. Ensure that the resistance of the input supply rail is low enough that an input current transient does not cause a high enough drop at the LM5165-Q1 supply rail to cause a false UVLO fault triggering and system reset. If the input supply is located more than a few inches from the LM5165-Q1 converter, additional bulk capacitance may be required in addition to the ceramic input capacitance. A 4.7-μF electrolytic capacitor is a typical choice for this function, whereby the capacitor ESR provides a level of damping against input filter resonances. A typical ESR of 0.5 Ω provides enough damping for most input circuit configurations.