A Digital PWM Regulator Based on Serial-Error Correcting Mechanism for DC-DC Buck Conversion

This paper describes the design and implementation of a digital pulse-width modulation (PWM) regulator using a serial feedback error voltage to adjust the input voltage of a high frequency switching dc-dc buck converter. The digital controller comprises an error process unit (EPU), a PID compensator and a digital PWM. The employment of a serial comparator and an error process unit (EPU) can greatly reduce the complexity of the analog-to-digital conversion. Moreover, a table look-up approach for the PID compensator alleviates the penalty of large chip area of multiplies. The proposed architecture has been validated with measured results.