8.2.1.2.8 Input Bypass Capacitor

Some input capacitance from the VIN pin to the GND pin may be necessary to filter noise and voltage spikes from the V_IN rail. If the current through Q1 in Figure 20 is very large a sudden shutdown of Q1 will cause an inductive kick across the line input and pc board trace inductance which could damage the LM5060. In order to protect the VIN pin as well as SENSE, OVP, UVLO, and nPGD pins from harm, a larger bulk capacitor from VIN to GND may be needed to reduce the amplitude of the voltage spikes. Protection diodes or surge suppressors may also be used to limit the exposure of the LM5060 pins to voltages below their maximum operating ratings.