在采用降压开关功率开关转换器降低正输入电压的同时，通常还需要一个额外的低功率负输出电压。
When we use low-dropout switching power switching converter to reduce positive input voltage, we usually need an extra low - power negative output voltage.
切换电路接收第三讯号并依据一参考电压，以 控制切换讯号的脉波宽度，所以可调整功率转换器的输出电 流。
Receiving the third signal and based on a reference voltage, the switching circuit controls the pulse wave width of the switching signal so as to adjust output current of the power converter.
典型电压按比例缩放式结构的数模转换器可保证输出的单调性。
The representative voltage scaling DAC have the monotonic property of output.
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