介绍了应用于低电压、大电流高频多相数字DC/DC控制器的设计。该控制器采用数字PID算法、电压模式控制,具有DVS功能。控制器在现场可编程门阵列(FPGA)上实现,采用Dither数字脉宽调制(DPWM)结构获得1MHz的开关频率。采用该控制器的四相Buck电路输入电压为12V,输出电压由8 bit VID码控制从0～1.6V可调,每相电流20A。实验结果证实了控制器的性能以及设计方法的正确性。
A new approach for the design and implementation of a programmable voltage reference based on an improved current mode bandgap voltage reference is presented. The circuit is simulated and fabricated with Chartered 0. 35μm mixed-signal technology. Measurements demonstrate that the temperature coefficient is ± 36. 3ppm/℃ from 0 to 100℃ when the VID inputs are 11110.As the supply voltage is varied from 2.7 to 5V, the voltage reference varies by about 5mV. The maximum glitch of the transient response is about 20mV at 125kHz. Depending on the state of the five VID inputs,an output voltage between 1.1 and 1.85V is programmed in increments of 25mV.
提出一种用于DC/DC变换器的数字自适应电压定位(Adaptive Voltage Position,简称AVP)控制器,与一般的控制器相比,它能让变换器使用更小的输出电容,因此可有效降低成本。控制器用现场可编程门阵列(FieldProgrammable Gate Array,简称FPGA)实现。变换器的开关频率为1MHz,输入电压为12V,输出电压可调节范围为0.875～1.875V。当负载在0.2～10A之间突变时,输出电压的变化为40mV。实验结果证明了设计的正确性。
