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1N4729A DATASHEET PDF

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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No load except for the DMM. Kvegaoro 2, 11 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. 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.

(PDF) 1N4729A Datasheet download

N14729a check this supply. Working out the current limiting resistor we have: 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.

Andy aka k 10 I don’t get it, where datasheef the 9ohms come from? Null 4, 10 22 What’s odd is that the BZX55C is showing more-or-less the same behaviour although with different resistors. How much current will th load require?

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.

1NA ON Semiconductor / Fairchild | Ciiva

Home Questions Tags Users Unanswered. You do not see 3.

The dynamic resistance describes the small-signal behavior near the test current. Sign up or log in Sign up 1j4729a Google. 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.

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1NA datasheet & applicatoin notes – Datasheet Archive

If 1n429a include the dynamic resistance in the model, you must use a lower voltage 1n47729a the ideal zener. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high. What output volta de you require? I see your edited? I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3. I wanted to confirm that I wasn’t doing anything stupid. In my experience, low-voltage zeners anything below 5V all seem to have a very soft ‘knee’ and not datasyeet ‘vertical’ current-vs-voltage curve.

Actually, as it happens I had reached the same conclusion. Can you expand n14729a the statement: Sign up using Email and Password. It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d expect. I set up the standard test circuit shown below.

There are a couple of issues 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. It’s incorrect to add a voltage at the test current because of the dynamic datasheet. Post as a guest Name. At least at no load or very small load the LDO regulator will be way more efficient.

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I have a question about the regulation accuracy or lack of of a 3V6 Zener datashwet. As I pointed out in my query, I used the test currents from the relevant datasheets as a guide.

Therefore a better model of the zener diode is the zener diode plus the zener resistance in series. This query was simply to highlight my dismay at how poor these zeners really are!

Spehro Pefhany k 4 First this stated in the question: Buck8pe 8 The next problem is that at 70mA and 4 volts, the power is 0. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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 increase the resistor the voltage across the zener should go down. Is that the dynamic resistance of the zener? The two Zeners in question are: In fact, as I increase and decrease the resistor value, the Zener voltage increases and decreases along with it.

It seems odd then that the datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light. 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”.

You don’t say what you saw there.

Rather than use rules of thumb which you may or may not understand, you should eatasheet look at the data sheet of the part you’re using.