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If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener. I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3.
In fact, as I increase and decrease the resistor value, the Zener voltage increases and decreases along with it.
The ones with voltage of dataheet. First this stated in the question: The two Zeners in question are: Is that the dynamic resistance of the zener? If 1n479a increase the resistor the voltage across the zener should go down.
That part of kveagaro’s answer is not correct. Actually, as it happens I had reached the same conclusion. I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect. Even so I expect that the diode you have does match its data sheet. dahasheet
1NA ON Semiconductor / Fairchild | Ciiva
What’s odd is that the BZX55C is showing datasneet the same behaviour although with different resistors. Because it rises as per the quote you must have an unstable power source of 5V and this is rising as you increase the load resistance. What output volta de you require?
I have a question about the regulation accuracy or lack of of a 3V6 Zener diode. In my experience, low-voltage zeners anything below 5V all seem to have a very soft ‘knee’ and not particularly ‘vertical’ current-vs-voltage curve.
The dynamic resistance of the Zener may not be able to drop low enough, even with 70mA available to it, to make the proper resistor divider equivalent for the node to be equal to 3.
(PDF) 1N4729A Datasheet download
If you want decent accuracy throw the zeners away and use some low dropout 3. Actually, this does explain what I’m seeing and your result is pretty spot on with what I’m reading. At least at datashet load or very small load the LDO regulator will be way more efficient.
As shown in the circuit below which models the behavior that you are seeing of a voltage reading of about 4V from the zener diode. You do not see 3. Try to find a datasheet for your specific zeners which shows the breakdown characteristics. Working out the current limiting resistor dqtasheet have: Does this conflict with what Kvegaoro is saying?
It seems odd then that the datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light. As I pointed out in my query, I used the test currents from the relevant datasheets as a guide.
1NA Datasheet(PDF) – Diodes Incorporated
It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d expect. Andy aka k 10 The dynamic resistance describes the small-signal behavior near the test current.
How much current will th load require? Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3. See Fig 2 in diodes. Even if it specified at 70mA, there is going to be some there and in this case it is not negligible therefore it must be incorporated in to your circuit model, that why your circuit analysis provides a different answer but adding the zener resistance to the model gives a solution that daatsheet more closely your result.
Both Zeners came from separate suppliers. I wanted to confirm that I wasn’t doing anything stupid. Home Questions Tags Users Unanswered.
Buck8pe 8 Indeed it would seem to be a much easier solution to just get an adjustable LDO, if this 1n47229a is meant to be used as regulated supply voltage. I don’t get it, where did the 9ohms come from? You don’t say what you saw there. I see your edited? Zeners with nominal voltages less than 5V or datashest have very soft ‘knees’ poor regulation and are not really that useful as usually better alternative are available.
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