To check the robustness of the device with respect to changes on the load, a load step between 0.5A and 4.5A is applied at the output, with 100Hz frequency, both in configurations Resistor and Analog. From Figure 4-6 and Figure 4-7, the device takes just 1ms to recover, with overshoot and undershoot of maximum 1.4% in Resistor and 1.1% in Analog configuration. One interesting thing to note on both images is that the device stops switching (and inductor current goes to zero) as soon as the output voltage increases beyond the set value because of the overshoot. When the output value falls again below this threshold, the device resumes normal operation.

Figure 4-6 Load Transient for Configuration Resistor (24Vout)

Figure 4-7 Load Transient for Configuration Analog (48Vout)