Semtech Power Supplies 101

　　Semtech Power Supplies 101

　　在最基本的术语，降压稳压器需要一个输入电压，并将其转换为负载所需的较低电压。有两种主要类型的稳压器，线性和开关。线性稳压器的工作原理是通过吸收输入和输出之间的能量差，而开关稳压器的输入电压，然后平均斩波电压，以提供适当的输出电压。

　　一个电压调节器，它被放置在接近设备或设备，它是供电通常被称为一个点的负载调节器。这种类型的稳压器经常收到从一个包含在PCB上的电压总线的输入。

　　There are several parameters that should be considered when evaluating power supplies for particular applications.

　　Quiescent Current – The amount of current an IC consumes when it is not source current and its inputs are not cycling.

　　Efficiency – Defined as the ratio of power into a regulator circuit to the output power delivered by the regulator. Power input includes quiescent currents， losses due to parasitic components and power delivered to the load.

　　Equivalent Series Resistance – The resistive component of the capacitors used in a regulator circuit. Attention needs to be paid to the ESR of the capacitors of the output.

　　The Loop – Defined as all the elements affecting the output and stability of a regulator. This includes such blocks as the power stage， error amplifier， modulator， and compensation circuits.