LM334M DATASHEET PDF

Mikakazahn My goal dxtasheet to make an alarm of sorts when that impedance exceeds a threshold, and the way I want to do that is to detect when the is in current limiting mode. Tyler Think of it rather as a current limiter. So if the LM is connected low side and sinking 1mA, and you want to know when the forward voltage drops below 1V you can use a comparator with a 1V reference. Post as a guest Name.

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Tyler Think of it rather as a current limiter. If anyone else has an idea of how to light an LED when daatasheet LM is actually limiting the current through it, that would work too. Sign up using Facebook. The divider produces about 0. Please edit your question and delete the comment. Post as a guest Name. If the voltage is more than 2. Sign up or log in Sign up using Google. The trip point is intended to be no higher than ohms per volt — 10k. It belongs in the question.

If the load impedance is high, then the current will be much lower than the limit. If the load lm is low, then the current will hit the limit.

The typical performance is shown in the datasheet in this graph:. Sign up using Email and Password. The simplest way to detect that would be by biasing a PNP transistor with a scaled-down version of l3m34m drop out voltage.

Spehro Pefhany k 4 I need to use an opto between this lmk and the logic systems for safety. When the 1 mA of current is reached, lmm should begin to increase its resistance, thus increasing the voltage drop across it. So for low currents, it might be delivering more-or-less constant current at 0. The current limiter is intended to limit the amount of ground leakage.

You can increase the resistance of the divider if you can use a larger load resistor R3 or a higher-gain transistor. The detection threshold would be something like 1V. All of that is true. Furthermore, I think datsaheet rather crazy that you allow such high ground impedance 10k. My goal is to make an alarm of sorts when that impedance exceeds a threshold, and the way I want to do that is to detect when the is in current limiting mode. A couple of resistors and a comparator with built-in reference would do the job in a much simpler fashion.

Note as well that the actual circuit ground is on the top side of R1 — Vout is the ground potential for the purpose of this circuit. Othewise, the load is getting the maximum voltage that the source can provide, and is not running at full current. Usually when a current supplied less than the current required, there is a voltage drop. Any real kmm source will have a voltage limit beyond which it will not deliver a constant current.

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LM334M National Semiconductor, LM334M Datasheet

Note as well that the actual circuit ground is on the top side of R1 — Vout is the ground potential for the purpose of this circuit. Please edit your question and delete the comment. The divider produces about 0. If the load impedance is low, then the current will hit the limit. The actual earth is on the far side of R1. The reference could be derived from a regulated supply voltage such as 5V with a voltage divider. The typical performance is shown in the datasheet in this graph: The current limiter is intended to limit the amount of ground leakage.

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