A 10/30 MHz Fast Reference-Tracking Buck Converter With DDA-Based Type-III Compensator
A 10/30 MHz Fast Reference-Tracking Buck Converter With DDA-Based Type-III Compensator
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DOI：
10.1109/jssc.2014.2346770
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发表时间：
2014-08
影响因子：
5.4
通讯作者：
Lin Cheng;Yonggen Liu;W. Ki
中科院分区：
文献类型：
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作者：
Lin Cheng;Yonggen Liu;W. Ki
提出了一种宽占空比的10/30 MHz电压模式控制降压变换器。提出了一种仅使用低速比较器但工作频率可达70 MHz的高精度延迟补偿斜坡发生器。通过使用差分差分放大器（DDA），提出了一种新的III型补偿器，以减少60%的补偿器的芯片面积。此外，基于所提出的补偿器的独特结构，端点预测（EPP）计划也实现了快速的参考跟踪响应。该转换器采用0.13 μm标准CMOS工艺制作。在10 MHz和30 MHz下开关时，其占空比范围分别为0.75和0.59，峰值效率分别为91.8%和86.6%。在2.4 V输出电压和1.5 A负载电流下，测得最大输出功率为3.6 W。当负载电流为500 mA时，开关频率为10 MHz和30 MHz时，上跟踪速度分别为1.67 μs/V和0.67 μs/V。10 MHz和30 MHz下跟踪速度分别为4.44 μs/V和1.56 μs/V。
A 10/30 MHz voltage-mode controlled buck converter with a wide duty-cycle range is presented. A high-accuracy delay-compensated ramp generator using only low-speed comparators but can work up to 70 MHz is proposed. By using a differential difference amplifier (DDA), a new Type-III compensator is proposed to reduce the chip area of the compensator by 60%. Moreover, based on the unique structure of the proposed compensator, an end-point prediction (EPP) scheme is also implemented to achieve fast reference-tracking responses. The converter was fabricated in a 0.13 μm standard CMOS process. It achieves wide duty-cycle ranges of 0.75 and 0.59 when switching at 10 MHz and 30 MHz with peak efficiencies of 91.8% and 86.6%, respectively. The measured maximum output power is 3.6 W with 2.4 V output voltage and 1.5 A load current. With a constant load current of 500 mA, the up-tracking speeds for switching frequencies of 10 MHz and 30 MHz are 1.67 μs/V and 0.67 μs/V, respectively. The down-tracking speeds for 10 MHz and 30 MHz are 4.44 μs/V and 1.56 μs/V, respectively.