Zener Regulator Design

One approach to Zener regulator design is to consider the desired load current and the amount of ripple present in the available unregulated supply.

If the available power supply has 如果可用的功率供应有

= v

,

or ripple factor = % 或波纹系数 = % 中文译文中的待填/计算数值依次对应：1：rf。实际数值以上方原输入框为准。

and a zener voltage 以及一个泽纳电压

= V

Then to design for regulated output current of 0 to 然后设计为输出电流调节范围为0到

= mA

requires a resistor value 需要电阻值

=

This design with a load resistance 这种带有负载电阻的设计

=

will give an output current 将产生输出电流

=

mA

Caution!! If this current is greater than the maximum design current you chose above, then it will not happen! You have chosen too small a load resistance. Also, the power values below will not be correct, because you are beyond the design range and will not be supplying enough voltage to the zener diode to allow it to give the zener voltage out.

注意！！如果这个电流大于你上面选择的最大设计电流，那么它就不会发生！你选择的负载电阻太小了。此外，下面的功率值也将不正确，因为你已经超出了设计范围，无法为齐纳二极管提供足够的电压以使其输出齐纳电压。

and output power 和输出功率

= W

To do this, it will require input power 这将需要输入功率

= W.

With this design approach, you must check the power ratings of your output resistor and Zener diode to make sure they are able to handle the power requirements.

采用这种设计方法时，必须检查输出电阻器和齐纳二极管的功率额定值，以确保它们能够满足功率需求。

The power rating of the load resistor must be at least

= W

and the power rating of the zener diode must be

= W

负载电阻的功率额定值必须至少为，并且齐纳二极管的功率额定值也必须为

中文译文中的待填/计算数值依次对应：1：pl 2：pz。实际数值以上方原输入框为准。

This design strategy is a practical, operational one: to design for a ripple-free output voltage up to a specified current maximum. Once done, you can choose load resistances which push the current up to this maximum and maintain regulation. However, it is easy to choose load resistances which push the current over the design maximum, and then the powers which this routine calculates will not be correct - they assume that the zener diode is operating at it's design voltage, and if you choose too small a load resistance, you drop the supply voltage at the zener below that voltage. The zener would then be acting like a voltage source, which of course it cannot do - it must have a supply voltage greater than the design voltage in order to regulate to that voltage.

Calculation note: You may substitute values for the zener voltage, the input voltage, the ripple voltage or ripple factor, and the load resistor. The other parameters will be calculated. Default values will be entered for unspecified parameters used in the calculation.

Caution about use of the ripple factor: the relationship between the ripple factor and the amplitude of the ripple factor uses some details about the nature of common filters, and the numerical value of the ripple factor will be accurate only for rectified 60 Hz inputs where the ripple is fairly small. See the development of the ripple expression.