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how to prevent voltage change using zener diode? Answered

zener diodes only regulate voltage when it is within its regulation range. in a simple zener regulator, voltage in the resistive load changes as the resistance of the load changes, but this is usually a small change. now, my question is, is it possible to prevent this small change? how?



7 years ago

The "regulation range" is set by ensuring that there is always some current flowing in the zener, and that the maximum current x zener voltage < the dissipation limit of the diode. Ensuring that the device is biased correctly will help a lot, but ultimately the performance of the zener is not well specified in precision applications, and you really need a proper reference device.