All-digital controlled boost DC-DC converter with all-digital DLL-based calibration

作者：Kao Shao Ku^*; Wu Jen Hou; Cheng Hsiang Chi

来源：Microelectronics Journal, 2015, 46(10): 970-980.

DOI：10.1016/j.mejo.2015.07.011

• All-digital control
• Pulse width modulation
• Boost converter
• All-digital delay-locked loop
• ADDLL
• Phase correction
• Digital-analog converter

Traditional digital controls mostly use digital-analog converters to convert input and output voltages into digital coding to achieve control. This paper proposes the use of two digital ramps with two different frequencies to replace a digital-analog converter. This approach can produce seven bit resolution for the DPMW signal. In addition, we use an all-digital DLL phase correction concept to further enhance the resolution of the DPWM signal by an additional three bits, resulting in 10-bit DPWM signal resolution. The proposed circuit uses 0.35 mu m CMOS processes, with a core area of 0.987 mm(2), a system switching frequency of 500 KHz, an input voltage range of 3.3-4.2 V, and an output voltage range of 5 V. Output voltage measurement accuracy reaches 99%, while the system reaches efficiency of 91% with output loads of up to 500 mA.

• 出版日期2015-10
• 单位长春大学