Post Go back to editing

LTC3882 multiphase current sharing at load step


I'm looking at LTspice macromodel's design example of LTC3882. It's a 2-phase single output design.

In constant load state inductors currents are equal, so the load sharing between phases works as expected.

However when I apply a load step, all additional current goes through one inductor. Second inductor's current increases slowly until it matches first inductor's current.

If I add even more current to step load, the second inductor may even skip a cycle instead of sharing a load, so one phase must be capable of delivering almost all current to the load.

Is that expected behavior of real device or a spice model issue?



Applied step load to the macromodel's example design:

Inductors currents not equally shared at step load (0.9 ms)