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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Even if it specified at 70mA, there is going to be some there and in this case it is not negligible therefore it must eatasheet 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. Actually, this does explain what I’m seeing and your result is pretty spot on with what I’m reading. Try to find a datasheet datwsheet your specific zeners which shows the breakdown characteristics.
Andy aka k 10 WhatRoughBeast 49k eatasheet 28 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. Can I still get a reliable voltage if Vcc dips below 5V?
Even so I expect that the diode you have does match its data sheet. Double check this supply.
Sign up using Facebook. In fact, as I increase and decrease the resistor value, the Zener voltage increases and decreases along with it. I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3.
I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect. There are a couple of issues here. 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.
(PDF) 1N4729A Datasheet download
What output volta de you require? If you want decent accuracy throw the zeners away and use some low dropout 3. What’s odd is that the BZX55C is showing more-or-less the same behaviour although with different resistors.
I set up the standard test circuit shown below. The dynamic resistance describes the small-signal behavior near the test current. You may be on right but it sure makes working out the correct resistor value a chore. Actually, it was a candidate for a regulated supply fed by a CCS. I don’t get it, where did the 9ohms come from? Spehro Pefhany k 4 If you want to get 3. That part of kveagaro’s answer is not correct. The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL See Fig 2 in diodes.
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.
1NA Datasheet(PDF) – Diodes Incorporated
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.
Typically the dynamic resistance of the 1NA is about 5 ohms, so you could approximate it with an ideal 3. Actually, as it happens I had reached the same conclusion. Because it rises as per the quote you must have an unstable power source of 5V and this is rising as you increase daatsheet load resistance. Sign up or log in Sign up using Google. Zeners are notoriously power inefficient even at no load. 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.
Null 4, 10 22 First this stated in the question: Sign up using Email and Password. Buck8pe 8 I wanted to confirm dataheet I wasn’t doing anything stupid.
It’s like the Zener resistance isn’t datashete as the current increases, which is not what I’d expect. 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”. It seems odd then that 1n47729a datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light.
How much current will th load require?