When the MOSFET is turned OFF during conditions such as reverse current blocking in the system designs where there is an output C-L-C filter (for EMI filtering) as shown in Figure 10-1, the voltage across C_OUT can swing negative based on the values of L₂ ,C_OUT and the initial reverse current in L₂ before the MOSFET turns OFF. Use a low VF Schottky diode D₁ across C_OUT to GND and place a R-C filter with 100 Ω and 0.1 µF at Vs pin, ensuring the device pins does not exceed the Absolute Maximum Ratings.

^* Optional components needed for suppression of transients

Figure 10-1 Circuit Implementation with Optional Protection Components for LM74721-Q1