A scope shot showcasing R4’s transient response is shown on this slide. This was taken from an ISL68200 demo board, which shows Vout deviation with a 15 A load step using an all ceramic output cap design. CH1, the yellow waveform, is the output voltage. CH2, the blue waveform, is the switch node and CH3 is the load step. The take away here is that R4 can instantly respond to load transients, temporarily increasing both duty cycle and switching frequency to minimize Vout deviation. In this example, Vout deviation is kept to <2.5%, easily meeting the requirements of high-end FPGAs and ASICs which can require Vout deviation of <3%.