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引用次数: 4
摘要
在这项研究中，利用二次型和输入电压相关的补偿斜率，MOS电流型降压DC-DC变换器的输出电流在220 mA和20 mA之间突然变化，实现了小于10 us的快速响应时间。通过采用二次型且与输入电压相关的补偿斜率，电流反馈回路的频率特性保持恒定，只需调整电压反馈回路的频率特性即可确定变换器的整体频率特性。通过改变误差放大器的时间常数来控制相位裕度，使变换器的输出电压变化变小，响应时间变快。采用0.35 um CMOS工艺和5 MHz时钟的MOS电流型降压DC-DC变换器测试芯片实现了40.8 mV的输出电压变化和7.2 us的响应时间。
A method for realizing a fast response time for the output current change of a MOS current-mode buck DC-DC converter which utilizes a quadratic and vin-dependent compensation slope
In this study, a fast response time of less than 10 us has been realized for the sudden output current change between 220 mA and 20 mA of a MOS current-mode buck DC-DC converter which utilizes a quadratic and input-voltage-dependent compensation slope. By using a quadratic and input-voltage-dependent compensation slope, the frequency characteristics of the current feedback loop become constant, and the converter's overall frequency characteristics come to be determined by just adjusting the frequency characteristics in the voltage feedback loop. By changing the time constant in an error amplifier to manipulate the phase margin, the converter's output voltage change becomes small and its response time becomes fast. The test chip of a MOS current-mode buck DC-DC converter using a 0.35-um CMOS process and a 5 MHz clock realized a 40.8 mV output voltage change and a 7.2 us of the response time.
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