Apple Inc.
Loop Handoff Transient Mitigation for Multi-Loop Switch Mode Power Converters

Abstract:

A switching power converter may have a plurality of control loops, each control loop being configured to regulate a voltage or current of the converter. The multi-loop converter may be provided with a loop handoff transient mitigation circuit. The loop handoff transient mitigation circuit may be configured to modify the operating point of an inactive control loop to aid the transition from an active control loop to the inactive control loop. The loop handoff transient mitigation circuit may operate by clamping a voltage of the inactive loop to a voltage corresponding to a control voltage of the active control loop. The clamped voltage may be a control voltage of the inactive loop and/or may be a compensating capacitor voltage of the inactive control loop.