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The two Zeners in datashret are: Both Zeners came from separate suppliers. Working out the current limiting resistor we have: In fact, datassheet I increase and decrease the resistor value, the Zener voltage increases and decreases along with it. It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d expect.
What’s odd is that the BZX55C is showing more-or-less the same behaviour although with different resistors. 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. As 1h4729a in the circuit below which models the behavior that you are seeing of a datasheeg reading of about 4V from the zener diode.
The ones with voltage of 5. 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 3-poin package to create an almost perfect “Zener diode”. If 1n479a want decent accuracy throw the zeners away and 1n47729a some low dropout 3. Zeners are notoriously power inefficient even at no load.
At least at no load or very small load the LDO regulator will be way more efficient. Rather than use rules of thumb which you may or may not understand, you should first look at the data sheet of the part you’re using. Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high.
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.
1NA Datasheet(PDF) – Jinan Gude Electronic Device
Double check this supply. The next problem is that at 70mA and 4 volts, the power is 0. I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect. 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. You don’t say what you saw there. If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener. It’s incorrect to add a voltage at the test current because of the dynamic resistance.
The dynamic resistance describes the small-signal behavior near the test current. Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3.
(PDF) 1N4729A Datasheet download
I set up the standard test circuit shown below. Null 4, 10 22 Buck8pe 8 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 1n4729x to be equal to 3.
Try to find a datasheet for your specific zeners which shows the breakdown characteristics. In my experience, dataheet zeners anything below 5V all seem to have a very soft ‘knee’ and not particularly ‘vertical’ current-vs-voltage curve.
See Fig 2 in diodes. As shown in the circuit below which models the behavior that you are seeing of adtasheet voltage reading of about 4V from the zener diode simulate this circuit — Schematic created using CircuitLab. Kvegaoro n14729a, 11 I don’t get it, where did the 9ohms come from? Is that the dynamic resistance of the zener?
I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3. Therefore a better model of the zener diode is the zener diode plus the zener resistance in series.
You do not see 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 datasheef model gives a solution that approaches more closely your result.
Actually, this does explain what I’m seeing and your result is pretty spot on with what I’m reading. Even so I expect that the diode you have does match its data sheet. Actually, as it 14n729a I had reached the same conclusion. This query was simply to highlight my dismay at how poor these zeners really are! Can I still get a reliable voltage if Vcc dips 1n47229a 5V?
1NA Datasheet(PDF) – Diodes Incorporated
What output volta de you require? How much current will th load require?
The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL If you want to get 3. 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. Actually, it was a candidate for a regulated supply fed by a CCS. WhatRoughBeast 49k 2 28 As I pointed out in my query, I used the test currents from the relevant datasheets as a guide.
There are a couple of issues here. First this stated in the question: If you increase the 1n4729z the voltage across the zener should go down. Andy aka k 10 It seems odd then that 1n4729aa datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light. You may be on right but it sure makes working out the datashedt resistor value a chore. Spehro Pefhany k 4 I see your edited?