The 4-phase design was also found to require a larger number of bulk capacitors to meet the transient response requirements for VR 10.x designs.
The accuracy of current sharing is also an important part of converter design, a well balanced design reduces stress on components and the designer does not have to over design to compensate for inaccuracies in current sharing between the phases. Figure 5 shows the current sharing accuracy for the 6-phase design. As can be seen there is less than 4% variation in phase current and average current/ phase in the 6 phases.
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Figure 5. Current Sharing Accuracy: < 4% variation in phase current and average current/phase
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