| dc.description.abstract | The portable electronic product market is a thrust behind significant technological progress. As the device size continues to shrink, reducing silicon area, and also by reducing the supply of power to reduce the power consumption of digital circuits. But most specific supply voltage instead of a single power supply circuit, so by the power management unit DC-DC converters to meet the different and changing power needs. These power converters must have low power consumption and high efficiency to extend the service time of portable electronics. Thus, a high efficiency duty cycle voltage mode hysteretic control boost converter is presented in this thesis.
This thesis proposes a duty cycle voltage mode hysteretic control boost converter that use the hysteresis comparator to compare output voltage and reference voltage. And also use a fixed cycle pulse and low-level signal to control power MOSFETs. It has a fast transient response and high efficiency. And during the start-up period, there was a over-current problem, so we reduce the magnitude of over-current by adding a soft-start circuit.
This proposed duty cycle voltage mode hysteretic control boost converter is implemented with TSMC 0.35μm 3.3V CMOS process. In the proposed boost converter, the operation voltage is from 1.5V to 3.5V, the output voltage is 4V, the operation frequency is 1MHz, the output current is from 0.05A to 0.3A, and the highest efficiency is 94.15%, when the output load current is 300mA, the efficiency is still 85.08%. | en_US |