The catch diode current rating must be at least
1.3 times greater than the maximum load current. Also, if the power supply
design must withstand a continuous output short, the diode must have a current
rating equal to the maximum current limit of the LM2594. The most stressful
condition for this diode is an overload or shorted output condition. See Table 9-2. In this example, a 1-A, 20-V, 1N5817 Schottky diode provides the best
performance, and is not overstressed even for a shorted output.