| Summary: | 碩士 === 國立交通大學 === 電控工程研究所 === 101 === In recent years, portable devices involve several integrated chips with different functionality into the same printed-circuit-board (PCB) for achieving various functions. It needs a highly integrated power management module to reduce the volume and weight in order to keep up with the trend of compact size. Unfortunately, the off-chip inductor and capacitors for the high-efficiency switch-mode DC-DC converters occupy the large PCB area. That results in the extra manufacture cost and the problem for system-on-a-chip (SoC) integration. In addition, the parasitic inductive or capacitive coupling path generated from the bonding wire forms a harmful interference, which can be eliminate by integrating the off-chip components as many as possible. In other words, a highly integrated power management module is necessary for achieving high performance and small footprint area in today’s power management design.
This paper proposes a differential-in differential-out (DIDO) error amplifier with the P compensator to remove the use of the compensation capacitor. However, owing to the change of the compensation method, the load regulation performance should be compensated. Thus, the load regulation enhancement mechanism (LRE) is proposed in this paper to enhancement the load regulation performance. By using the above technique, a compact size and high performance DC-DC buck converter can be guaranteed.
The experimental results show that load regulation can be improved from 0.5mA/mV to 0.25mA/mV. Compared to other implementation, it does not need any compensation components to stabilize the system. The transient recovery time is about 13μS as the load current changes from 100mA to 500mA.
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