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Even if it specified at 70mA, there is going to datashedt 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 approaches more closely your result.
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Actually, as it happens I had reached the same conclusion. Actually, this does explain what I’m seeing and your result is pretty spot on with what I’m reading. 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.
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. It’s incorrect to add a voltage at the test current because of the dynamic resistance. First this stated in the question: If you want decent accuracy throw the zeners away and use some low dropout 3.
Email Required, but never shown. Even so I expect that the diode you have does match its data sheet. WhatRoughBeast 49k 2 28 In fact, as I increase and decrease the resistor value, the Zener voltage increases and n14729a along with it.
Home Questions Tags Users Unanswered. That part of kveagaro’s answer is not correct. Can I still get a reliable voltage if Vcc dips below 5V? The datasueet Zeners in question are: Buck8pe 8 Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3.
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I see your edited? Zeners with nominal voltages less than 5V or so have very soft ‘knees’ poor regulation and are not really that useful as usually better alternative are available. If you increase the resistor the voltage across the zener should go down. Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high.
At least at no load or very small load the LDO regulator will be way more efficient.
The dynamic resistance describes the small-signal behavior near the test current. I suspect that if daatsheet retest the “1N” parts with a test current of something like 20mA 70 ohms you 14n729a find that they’re within spec voltage-wise.
Can you expand on the datasyeet No load except for the DMM.
I set up the standard test circuit shown below. I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect. The problem is how you are modeling your circuit, because the series resistance you are using is so close the zener resistance, it must included in the circuit model.