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In fact, as I increase and decrease the resistor value, the Zener voltage increases and decreases along with it. Therefore a better model of the zener diode is the zener diode plus the zener resistance in series.
Is 1n429a the datashdet resistance of the zener? What output volta de you require? 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 1b4729a provides a different answer but adding the zener resistance to the model gives a solution that approaches more closely your result. Buck8pe 8 Can I still get a reliable datashdet if Vcc dips below 5V? Does this conflict with what Kvegaoro is saying?
Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high. I wanted to confirm that I wasn’t doing anything stupid. The next problem is that at 70mA and 4 volts, the power is 0.
How much current will th load require? There are a couple of issues here. I see your edited?
1NA Datasheet(PDF) – Diotech Company.
At least at no load or very small load the LDO regulator will be way datashest efficient. Post as a guest Name. Actually, as it happens I had reached the same conclusion.
For low voltage shunt regulation either use a series regulator LDO or a device such as the TL which has a band gap reference, and an opamp in a 1b4729a package to create an almost perfect “Zener diode”. I suspect that if you retest the “1N” parts with a test current of something like 20mA 70 ohms you may find that they’re within spec voltage-wise.
1NA Datasheet(PDF) – Rectron Semiconductor
Even so I expect that the diode you have does match its data sheet. You don’t say what you saw there. First this stated in the question: Sign up or log in Sign up using Google.
Indeed it would seem to be a much easier solution to just get an adjustable LDO, if this thing is meant to be used as regulated supply voltage. This query was simply to highlight my dismay at how poor these zeners really are!
If you want decent accuracy throw the zeners away and use some low dropout 3. Try to find a datasheet for your specific zeners which shows the breakdown characteristics. You may be on right but it sure makes working out the correct resistor value a chore.
Kvegaoro 2, 1n4279a I don’t get it, where did the 9ohms come from? 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 simulate this circuit — Schematic created using CircuitLab.
Zeners with nominal voltages dxtasheet than 5V or so have very soft ‘knees’ poor regulation and are not really that useful as usually better alternative are available.
If you want to get 3. I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect. I have a question about the regulation accuracy or lack of of a 3V6 Zener diode.
(PDF) 1N4729A Datasheet download
I suppose the point is, at datashest, according to the datasheet, the voltage across the zener should be 3. Because it datasjeet as per the quote you must have an unstable power source of 5V and this is rising as you increase the load resistance.
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. WhatRoughBeast 49k 2 28 Null 1n4729, 10 22 Zeners are notoriously power inefficient even at no load.
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. Sign up using Email and Password. You do not see 3. Working out the current limiting resistor we have: Double check this supply.
I set up the standard test circuit shown below.