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Email Required, but never shown. Since you are driving more than 10 times that amount of current through it, it datxsheet no wonder that your voltage is high.
Working out the current limiting resistor we have: Andy aka k 10 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.
Does this conflict with what Datashfet is saying? Null 4, 10 22 The two Zeners in question are: It’s like the Zener resistance isn’t decreasing as the current increases, which is datasueet what I’d expect. That part of kveagaro’s answer is not correct. How much current will th load require? You do not see 3.
1NA datasheet & applicatoin notes – Datasheet Archive
Sign up using Facebook. Spehro Pefhany k 4 First this stated in the question: Actually, as 1n4729w happens I had reached the same conclusion.
Sign up using Email and Password. Actually, it was a candidate for a regulated supply fed by a CCS. Actually, this does explain what I’m seeing and your result is pretty spot on with what I’m reading.
What output volta de you require? Can I still get a reliable voltage if Vcc dips below 5V? If you want to get 3. I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3. If you include the dynamic resistance in the model, you must use a lower voltage for the ideal zener.
Double check this supply. Zeners are notoriously power inefficient even at no load.
I’m not sure what the temperature coefficient is for this device and the data sheets are lacking in that respect. 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.
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. Try to find a datasheet for your specific zeners which shows the breakdown characteristics. I have a question about the regulation accuracy or lack of of a 3V6 Zener diode. 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.
I set up the standard test circuit shown below. In fact, as I increase and decrease the resistor value, the Zener voltage increases and decreases along with it.
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. The next problem is that at 70mA and 4 volts, the power is 0. The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL The ones with 1n472a of 5. Even so I expect that the diode you have does match its data sheet.
I don’t get it, where did the 9ohms come from? What’s odd is that the BZX55C is showing more-or-less the same behaviour although with different resistors.
The dynamic resistance describes the small-signal behavior near the test current. It’s incorrect to add a voltage at the datasneet current because of the dynamic resistance. 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 wanted to confirm that I wasn’t doing anything stupid. If you increase the resistor the voltage across the zener should go down.
Post as a guest Name. Indeed it would seem to be a much easier solution to just get an adjustable LDO, if this 1n472a is meant to 1n4729z used as regulated supply voltage. 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 1n4729z equal to 3.
Kvegaoro 2, 11 This query was simply to highlight my dismay at how poor these zeners really are!