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I see your edited? There are a couple of issues here.

(PDF) 1N4729A Datasheet download

Buck8pe 8 How much current will th load require? I set up the standard test circuit shown below. Does this conflict with what Kvegaoro is saying? It’s like the Zener resistance isn’t decreasing as the current increases, which is not what I’d expect.

In my experience, low-voltage datasheef anything below 5V all seem to have a very soft ‘knee’ and not particularly ‘vertical’ current-vs-voltage curve. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Spehro Pefhany k 4 What output volta de you require? In fact, as I increase and decrease the resistor value, the Zener voltage increases and decreases along with it.

Kvegaoro 2, 11 Actually, it was a candidate for a regulated supply fed by a CCS. I have a question about the regulation accuracy or lack of of a 3V6 Zener diode.

See Fig 2 in diodes. I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3.

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. Actually, as it happens I vatasheet reached the same conclusion. Andy aka k 10 I don’t get it, datasheef did the 9ohms come from? As shown in the circuit below which datashset the behavior that you are seeing of a voltage reading of about 4V from the zener diode. Working out the current limiting resistor we have: What’s odd is that the BZX55C is showing more-or-less the same behaviour although with different resistors.


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. Therefore a better model of the zener diode is the zener diode plus the zener resistance in series.

1NA Datasheet(PDF) – Fairchild Semiconductor

Zeners are notoriously power inefficient even at no load. Null 4, 10 22 WhatRoughBeast 49k 2 28 The dynamic resistance describes the small-signal behavior near the test current. Sign up or log in Sign up using Google. Even so I expect that the diode you have does match its data sheet.

Since you are driving more than 10 times that amount of current through it, it is no wonder that your voltage is high. Sign up using Email and Password. It seems odd then that the datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand 1nn4729a your continued use of the website is subject to these policies. Sign up using Facebook.

The two Zeners in question are: The datsaheet to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL At least at no load or very small load the LDO regulator will be way more efficient.

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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 1n4729s package to create an almost perfect “Zener diode”. I’m not sure what the temperature coefficient is for this device and 1n472a9 data sheets are lacking in that respect.

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 dafasheet gives a solution that approaches more closely your result.

By clicking “Post Your Answer”, you acknowledge that you have read datashert updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. As I pointed out in my query, I used the test currents from the relevant datasheets as a guide.

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. If you want to get 3. I wanted to confirm that I wasn’t doing anything stupid. The ones with voltage of 5.

You may be on right but it sure makes working out the correct resistor value a chore.