Select the correct Inductor value selection guide from Figure 8-4, Figure 8-5, Figure 8-6, or Figure 8-7. (Output voltages of 3.3 V, 5 V, 12 V or 15 V respectively). For other output voltages, see the design procedure for the adjustable version. Use the selection guide shown in Figure 8-5.
From the inductor value selection guide, identify the inductance region intersected by VIN(Max) and ILOAD(Max), and note the inductor code for that region. From the selection guide, the inductance area intersected by the 15-V line and 3-A line is L100.
Identify the inductor value from the inductor code, and select an appropriate inductor from the table shown in Figure 8-4. Part numbers are listed for three inductor manufacturers. The inductor chosen must be rated for operation at the LM2576 switching frequency (52 kHz) and for a current rating of 1.15 × ILOAD. For additional inductor information, see Section 8.1.2. Inductor value required is 100 μH from the table in Figure 8-4. Choose AIE 415-0930, Pulse Engineering PE92108, or Renco RL2444.