Programmable from 1µA to 10mA. □ ±3% initial accuracy. Description. The LM/LM/LM are 3-terminal adjustable current sources characterized by . LMM Texas Instruments Current & Power Monitors & Regulators NRND, alternate is LMM/NOPB datasheet, inventory, & pricing. LMM/NOPB Texas Instruments Current & Power Monitors & Regulators 3- TERM ADJ CURRENT SOURCE datasheet, inventory, & pricing.

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Kuba Ober 1, 10 The LM in this case does not have an infinite voltage with which to overcome the load impedance. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. The intent now is to connect the output to ground and measure the voltage drop across it instead.

datawheet The current limiter is intended to limit the amount of ground leakage. It’s also intended to at least attempt to desensitize the circuit to the tolerance variation of the k resistor and the supply voltage. You can increase the resistance of the divider if you can use a larger load resistor R3 or a higher-gain transistor. If the voltage is more than 2. The load has a variable impedance. If anyone else has an idea of how to daasheet an LED when an LM is actually limiting the current through it, that would work too.


LMM Datasheet(PDF) – National Semiconductor (TI)

The divider produces about 0. If that current doesn’t flow, then that’s an error. Can R3 be replaced datashet an opto-isolator diode and series resistor? Sign up using Email and Password. The comparator could be something like half an LM I don’t see a way in circuitlab to represent an actual LM, so the simulation likely won’t operate correctly. One option would be a TL datazheet LMV, but that’s just one of an almost infinite number of possibilities.

LM234Z-3/LM234Z-6/LM334M – 3-Terminal Adjustable Current Source Datasheet

A small current from an AC supply is intentionally “leaked” to ground. If it’s less than that it may or may not be working there is no minimum voltage below which is it is guaranteed to not work. If the load impedance is high, then the current will be much lower than the limit.

When it’s passing less than 1 mA of current, I would expect it to be acting like a very low-value resistor, meaning that the voltage drop across it should be low.

I’d expect it to be minimal, however, since the should be trying to pass as much current as it possibly can. At least, that’s my thinking at the present. Sign up using Facebook.

Datasheet «LM334»

Post as a guest Name. The typical performance is shown in the datasheet in this graph:. So if the LM dayasheet 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. In the schematic, I1 represents the LM If it is a “constant” current source, why is the current “variable”?


R2 completely determines the behavior of the system, when looked at from outside, and sets the leakage current. The detection threshold would be something like 1V. Note as well that the actual circuit ground is on the top side of R1 – Vout is the ground potential datassheet the purpose of this circuit. So what you do is connect R2 directly between L and PE terminals.

The typical performance is shown in the datasheet datwsheet this graph: Please edit your question and delete the comment. You need a different design, and I question the need for a current source.

It belongs in the question. Sign up or log in Sign up using Google. At 25C, the LM has a minimal drop-out voltage of about 0. This will vary over temperature and from unit to unit, that’s what they mean by ‘typical’. Email Required, but never shown.

Any real current source will have a voltage limit beyond which it will not deliver a constant current. I need to use an opto between this circuit and the logic systems for safety.