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. If you want to get 3. 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 simulate this circuit — Schematic created using CircuitLab.
If you want decent accuracy throw the zeners away and use some low dropout 3. For all private orders, please choose from among those companies only. At least at no load or very small load the LDO regulator will be way more efficient.
1N 데이터시트(PDF) – First Components International
Please be advised that only post services such as China Post, EMS are permitted to deliver private packages to Russia. This item cannot be shipped to United StatesPlease contact seller to resolve this.
Please give us your feedback about this page Click Here. 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.
I suppose the point is, at 70mA, according to the datasheet, the voltage across the zener should be 3. Zener impedance is measured at two points to insure a sharp knee on the breakdown curve and to eliminate unstable units 2. I see your edited?
Kvegaoro 2, 11 In fact, as I increase and decrease the resistor value, the Zener voltage datasheeh and decreases along with it. Other Product from Integrated Circuits. Actually, it was a candidate for a regulated supply fed by a CCS. Null 4, 10 22 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. For use in stabilizing and clipping circuits with high power rating.
Home Questions Tags Users Unanswered. 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. Reference Currency HKD The dynamic resistance describes the small-signal behavior near the test current. What output volta de you require? Is that the dynamic resistance of the zener? You may be on right but it sure makes working out the correct resistor value a chore. The closer to the minimum input voltage the more difficult it will be to avoid large changes in current flowing through the TL It seems odd then that the datasheets would specify an Izt of 69mA if it didn’t show the zener in the best light.
You can also buy SquareTrade Protection Plan for the products:.
Help improve your experience on DHgate. It’s incorrect to add a voltage at the test current because of the dynamic resistance.
If you include the dynamic resistance in the model, you must dataxheet a lower voltage for the ideal zener. How much current will th load require? Working out the current limiting resistor we have: You don’t say what you saw there.
The ones with voltage of 5. 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”. Does this conflict with what Kvegaoro is saying?
WhatRoughBeast 49k 2 28 Post as a guest Name. Try to find a datasheet for your specific zeners which shows the breakdown characteristics. See Fig 2 in diodes. Sign up using Email and Password. More Wholesale Integrated Circuits Resources wholesale diode 5mm wholesale super diodes wholesale diode ipl wholesale lazer diodes wholesale diode 1w Integrated Circuits on Sale discount diode ipl discount white diode 3w discount zener diodes discount types diodes discount led pure white diodes Online Shopping Integrated Circuits diode online lighting emitting diode green online diode wiring online small diodes online diode violet online Integrated Circuits Suppliers common diodes supply diode 5mm supply super diodes supply diode 1w supply diode regulator supply Integrated Circuits Coupons emitting diodes coupons 8mm diode coupons diode rgb coupons through hole diode coupons lllt diode coupons Shop By Country smd diode white Canada 5w diode Australia white diodes NZ diodes sale UK flashing diodes Canada high diode Australia mini diode NZ smd diodes UK.
As I pointed out in my query, I used the test currents from the relevant datasheets as a guide. 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.
Buck8pe 8 Andy aka k 10 Other Zener voltages and tolerances are available upon request. You May Also Like.