1NA datasheet, 1NA pdf, 1NA data sheet, datasheet, data sheet, pdf, BKC International Electronics, V, 1 W silicon zener diode. 1NA. 1NA. 1NA. 1NA. . This datasheet contains the design specifications for product develop- ment. Buy MULTICOMP 1NA online at Newark element 1NA – Zener Single Diode, V, 1 W, DO, Technical Datasheet: 1NA Datasheet.
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You don’t say what you saw there. I set up the standard test circuit shown below.
If you increase the resistor the voltage across the zener should go down. 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 dxtasheet.
Sign up using Email and Password. If you want to get 3. Sign up using Facebook. If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener. 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. I wanted to confirm that I wasn’t doing anything stupid.
Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high. You do not see 3. See Fig 2 in diodes. I see your edited? Actually, as it happens I had reached the same conclusion.
Double check this supply. Datashert closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL In my experience, low-voltage zeners anything below 5V all seem to have a very soft ‘knee’ 1nn4729a not particularly ‘vertical’ current-vs-voltage curve.
At least at no load or very small load the LDO regulator will be way datasheeet efficient. 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.
I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3. Post as a guest Name. If you want decent accuracy throw the zeners away and use some low dropout 3. How much current will th load require? Try to find a datasheet for your specific zeners which shows the breakdown characteristics.
Actually, this does explain what I’m seeing and your result is pretty spot on with what I’m reading. Actually, it was a candidate for a regulated supply fed by a CCS. 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.
(PDF) 1N4729A Datasheet download
I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect. Is that the dynamic resistance of the zener? 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.
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. Email Required, but never shown. Home Questions Tags Users Unanswered. The ones with voltage of 5. 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. I have a question about the regulation accuracy or lack of of a 3V6 Zener diode.
That part of kveagaro’s answer is not correct.
Because it rises as per 1n479a quote you must have an unstable power source of 5V and this is rising as you increase the load resistance.
It’s incorrect to add a voltage at the test current because of the dynamic resistance. Buck8pe 8 WhatRoughBeast 49k 2 28 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.
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 dayasheet voltage. I don’t get it, where did the 9ohms come from? Can I still get a reliable voltage if Vcc dips below 5V?
1NA Datasheet(PDF) – Diotech Company.
Even so I expect that the diode you have does match its data sheet. Andy aka k 10 Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3.
You may be on right but it sure makes working out the correct resistor value 1n47729a chore. The next problem is that at 70mA and 4 volts, the power is 0. Sign up or log in Sign up using Google. Can you expand on the statement: