Apparatus and method for seamless non-linear voltage regulation control to linear control

The invention relates to an apparatus and method for seamless non-linear voltage regulation control to linear control. A digital control scheme controls the integrator of the PID filter to achieve non-linear control of the saturation duty cycle during which the proportion and differential terms of the PID filter are set to zero, while the integrator and its internal state (previous value or memory) are set to a duty cycle that is the sum of the current nominal duty cycle plus delta D. The delta D is a maximum duty cycle increment for regulating the voltage regulator from ICCmin to ICCmax, and is a configuration register that can be set after tape-out. The FSM transitions from a non-linear fully-open state to an open-loop duty cycle, which maintains the output voltage slightly above the desired Vref. In the open-loop state, after a period of time, the FSM slowly drops the open-loop duty ratio until the output voltage is close to Vref. 本公开涉及无缝非线性电压调节控制到线性控制的装置和方法。数字控制方案控制PID滤波器的积分器实现饱和占空比的非线性控制，在此期间PID滤波器的比例和微分