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线性稳压器的工作原理
下载“第Ⅳ章：本地电源IC” (PDF:770KB)
串联稳压器
如左下图所示，不需要外部组件。（需要输入／输出电容器）
MOSFET作为可变电阻进行工作，因此输出电压变为恒定电压。
MOSFET的漏极和源极之间的电位差（VIN－VOUT）×输入电流（IIN）将产生损耗。例如，如果输入是5V，输出是3V，则效率是60%。它用于要求低噪声和精确输出电压的电路电源。
并联稳压器
右下图中虚线所包围的区域是IC。它需要三个外部电阻。内置晶体管作为可变电阻进行工作，因此IK＋IOUT＝IIN＝常数。其结果是，在RSD处产生的电压变为恒定，并且输出电压变为恒定电压。但除了输出电流外，还需要通过晶体管的阴极电流。此外，在输入侧电阻RSD处存在电压降，这将降低效率。它用于低电流（~20mA）应用，比如开关电源参考电压和开关电源光耦驱动电路。
