8.2.1.2.3 D1 and D2 Selection for Inductive Kick-Back Protection

Diode D1 and capacitor C1 and diode D2 and capacitor C2 in the Figure 27 serve as inductive kick-back protection to limit negative transient voltage spikes generated on the input when the input supply voltage is abruptly shorted to zero volts. As a result, the LM5050-1 IN pin will see a negative voltage spike while the OUT pin will see a positive voltage spike. The IN pin can be protected by schottky diode (D1) clamping the pin to GND in the negative direction, similarly the OUT pin should be protected with a TVS protection diode (D1), or with a local bypass capacitor, or both. D1 is selected as 1-A, 60-V Schottky Barrier Rectifier (SS16T3G) and D2 is the 60 V, TVS (SMBJ60A-13-F).