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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I see your edited?
It’s incorrect to add a voltage at the test current because of the dynamic resistance. If you want decent accuracy throw the zeners away and use some low dropout 3. Is that the dynamic resistance of the zener?
The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL I don’t datashete it, where did the 9ohms come from? Actually, it was a candidate for a regulated supply fed by a CCS. Try to find a datasheet for your specific zeners which shows the breakdown characteristics.
Sign up using Facebook. I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3. 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.
I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect. Actually, as it happens I had reached the same conclusion. The dynamic resistance describes the small-signal behavior near the test current.
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. Andy aka k 10 First this stated in the question: There are a couple of issues here.
(PDF) 1N4729A Datasheet download
I wanted to confirm that I wasn’t doing anything stupid.
Semtech 1NA – PDF Datasheet – Zener Diodes In Stock |
See Fig 2 in diodes. The two Zeners in question are: Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high.
The problem is how you are modeling your circuit, because the series resistance you are using is so close the 1n729a resistance, it must included in the circuit model. Even so I expect that the diode you have does match its data sheet.
It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d expect. Does this conflict with what Kvegaoro is saying?
This query was simply to highlight my dismay at how poor these zeners really are! If you want to get 3. You don’t say what you saw there. 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.
What output volta de you require? Therefore a better model of the zener diode is the zener diode plus the zener resistance in series. Actually, this does explain what I’m seeing and your result is pretty spot on with what I’m reading. Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 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.
Post as a guest Name. Can I still get a reliable voltage if Vcc dips below 5V? At least at no load or very small load the LDO regulator will be way more efficient.