The output is set to 1.7V, but can be adjusted from 1.1 to 1.85V by setting S1 according to the VID codes provided in Table 1. Droop control is set to 50mV at 40A, but can be adjusted by following the instructions in the data sheet for the PWM controller. The switching frequency per phase is set to 500kHz with the frequency set resistor R4. This creates an effective output frequency of 1MHz. The graph in figure 1 shows the relationship between R4 and the switching frequency per phase. This frequency may be adjusted by changing R4 according to this graph; however, extreme changes from the 500kHz set point may require redesigning the control loop and adjusting the values of input and output capacitors. Also, refer to the SOA graph in the iP2001 datasheet for maximum operating current at different frequencies.