One-Chip Regulators

单芯片调节器

Many, if not most, small power supplies today are built with the aid of a family of one-chip regulators which use zener diodes and several transistors to regulate the output of a rectifier. These remarkable devices provide stable, ripple-free output DC voltages under a wide range of operating conditions.

如今，许多甚至大多数小型电源都是借助一组单芯片调节器构建的，这些调节器利用齐纳二极管和几个晶体管来调节整流器的输出。这些非凡的器件能够在广泛的运行条件下提供稳定、无纹波的直流电压。

An example is Fairchild's mA7800 series of 3-terminal positive voltage regulators. In a single monolithic package they incorporate two zener diodes, 17 transistors, 21 resistors and a capacitor according to the manufacturer's equivalent circuit. They incorporate internal current limiting and thermal shutdown features and can produce on the order of an ampere of output current.

一个例子是Fairchild公司的M A7800系列三端正电压调节器。它们在一个单片封装中集成了两个齐纳二极管、17个晶体管、21个电阻和一个电容器，根据制造商等效电路。它们集成了内部限流和热关断功能，可以产生约一安培的输出电流。

Zener Role in Power Supplies

齐纳二极管在电源中的作用

The zener diode is widely used as a voltage regulator because of its capacity to maintain a constant voltage over a sizeable range of currents. It can be used as a single component across the output of a rectifier or incorporated into one of the variety of one-chip regulators.

齐纳二极管因其维持在较大电流范围内恒定电压的能力而被广泛用作电压调节器。它可以作为单个元件跨接在整流器的输出端，或被集成到多种单芯片调节器之一中。