The following Bode plots were captured with a 12V input.

The Bode plots in Figure 2-4 and Figure 2-5 were created at a 4A load with Figure 2-4 having a –7.5V output and Figure 2-5 having a –12V output. The Bode plots were constructed via a combination of the output impedance with the loop open and closed.

The –7.5V output at 4A load Bode plot results in a gain margin of 17dB, a phase margin of 50°, and a crossover of 20kHz. The –12V output at 4A load Bode plot results in a gain margin of 13dB, a phase margin of 49°, and a crossover of 19kHz.

Figure 2-4 Bode Plot, 12V input, –7.5V Output, 4A Load

Figure 2-5 Bode Plot, 12V input, –12V Output, 4A Load