Sometimes it doesn't - the zeners can be grouped as either PTC or NTC, the break even point is somewhere around 5.6V.I've always thought that zeners were terrible as voltage references due to their temperature drift sensitivity. How come a zener and an ordinary 1N400x in series tend to cancel their temp drift?
The old standard was a 5.6V zener providing the reference for an emitter follower series pass transistor - you lose about 0.6 - 0.7V ish on the B/E junction, so it comes out at pretty close to 5.0V.If i want a 5V regulated output from a Zener diode from a VS of 12V , how do i calculate it ?
I assume i have to drop 7V on the series resistor to have 5V on the zener. But if the breakdown voltage of my zener is 5.6 then this will not be sufficient, correct ?
- Do i have to put a Zener diode of 4,7 breakdown voltage then ?
- Is the zener breakdown region available in any voltage range (untill it reaches it's limit) For example if i put 8 V on a Zener of 5,6 breakdown will it also have the self regulating function but then on 8 Volts ?
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