Figure 3-15 and Figure 3-5 display the start-up waveforms at 24-V and 48-V input into a ⅓-Ω constant-resistance load using an electronic load. The board Enable is pulled LOW, by connecting it to PGND, then turning ON the benchtop power supply to the desired input voltage, and then pulling the board Enable HIGH, by disconnecting it from PGND.

Figure 3-4 24-V_IN Start-Up

Figure 3-5 48-V_IN Start-Up

Figure 3-6 and Figure 3-7 show the shutdown waveforms at 24-V and 48-V input into a ⅓-Ω constant-resistance load using an electronic load. While the benchtop power supply is ON and at the desired input voltage and the board Enable is HIGH, the board Enable is pulled LOW by connecting it to PGND.

Figure 3-6 24-V_IN Shutdown

Figure 3-7 48-V_IN Shutdown