AUTO-TUNING SWITCHING REGULATOR

摘要

In an example, a system and method are disclosed for providing a single control law that is operable to regulate both small-signal, steady-state operation, and large-signal transients of a switching regulator. The control law is based on detecting a zero-crossing of capacitor current, and projecting in advance a turning point for either ramping up or ramping down capacitor voltage at a target voltage. Certain embodiments may realize the control function in high-speed analog components, although certain other embodiments may implement the same or a similar control law in a digital controller.

主权项

1. A switching regulator comprising:
an inductor with inductance L operable to receive an input voltage; a capacitor with capacitance C electrically coupled to the inductor; a switch electrically disposed to regulate a voltage vL, across the inductor; and a controller operable to control switching of the switch by carrying out a control law for both small-signal current changes and large current transients, comprising:
monitoring a current through the capacitor iC;predicting a turning point for switching the switch based on the current through the capacitor;switching the switch at the turning point; andautomatically tuning the switching regulator to a coefficient of the switching regulator to match a coefficient of the control law.