Secondary Side CMOS Feedback Control Integrated Circuit.

摘要

This thesis describes the development of a CMOS secondary side feedback control integrated circuit for a power converter. The feedback controller was designed for use in miniaturized point-of-load DC-DC switching power converters. The integrated circuit compares the output of the converter to an on-chip reference voltage and encodes the resulting error signal on an amplitude modulated carrier square wave. The circuit was designed and verified with extensive computer simulations before being fabricated through the MOSIS program in the 2 micron, nwell CMOS process. Errors in the integrated circuit layout were repaired using a Focused Ion Beam, demonstrating the beam's ability to make both connections and detachments on integrated circuits. The design included four major subcells, a temperature independent bandgap voltage reference, an error amplifier, an oscillator, and an amplitude modulator. Subcell testing demonstrated the suitability and versatility of CMOS for high-density power converter control circuitry. Theses. (JHD)