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Does this conflict with what Kvegaoro is saying? I see your edited? It’s incorrect to add a voltage at the test current because of the dynamic resistance.
Sign up or log in Sign up using Google. First this stated in the question: Sign up using Email and Password. This query was simply to highlight my dismay at how poor these zeners really are!
Spehro Pefhany k 4 Double check this supply. The ones with voltage of 5. 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. 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. 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.
As I pointed out in my query, I used the test currents from the relevant datasheets as a guide. Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3. I have a question about the regulation accuracy or lack of of a 3V6 Zener diode.
Both Zeners came from separate suppliers. Working out the current limiting resistor we have: Actually, this does explain what I’m seeing and your result is pretty spot dayasheet with what I’m reading.
You do not see 3. Rather than use rules of thumb which you may or may not understand, you should first look at the data sheet daatsheet the part you’re using. The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL No load except for the DMM. For low voltage shunt regulation either use a datasheey regulator LDO or a device such as the TL which has a band gap reference, and an opamp in a 3-poin package to create an almost perfect “Zener diode”.
Email Required, but never shown. Can you expand on the statement: Kvegaoro 2, 11 I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3. 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 approaches more closely your result.
If you want to get 3. I set up the standard test circuit shown below. Therefore a better model of the zener diode is the zener diode plus the zener resistance in series. Home Questions Tags Users Unanswered. It seems odd then that the datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light.
1NA Datasheet(PDF) – Jinan Gude Electronic Device
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.
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.
It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d expect. Even so I expect that the diode you have does match its data sheet. The next problem is that at 70mA and 4 volts, the power is 0.
(PDF) 1N4729A Datasheet download
There are a couple of 1b4729a here. 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. Post as a guest Name. I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect.
Actually, it was a candidate for a regulated supply fed by a CCS. Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high.
Zeners are notoriously power inefficient even at no load. The two Zeners in question are: You may be on right but it sure makes working datashet the correct resistor value a chore. Try to find a datasheet for your specific zeners which shows the breakdown characteristics.