LMH/ Texas Instruments Linear Voltage Regulators LMH/ Voltage Regulator datasheet, inventory, & pricing. The LM/LMC is a voltage regulator designed prima- rily for series regulator applications. By itself, it will supply output currents up to mA; but external. The LM is a monolithic integrated programmable voltage regulator, assembled in. lead dual in-line plastic package. The circuit provides internal current.

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It should be at least 2W rated and I’d use a 5W as they are about as cheap and much safer. I’m not overly familiar with such things but I suspect it was probably standard practice in that day.

The negative Vout will of course not happen with a ground referenced positive input supply, but would be possible if Vin was referenced against some negative value. Also, Q1 is a transistor – which I’m sure was just a mistake.

National Semiconductor

I actually managed to figure out the part about how it varies the voltage from by myself on the weekend, I was pretty happy with myself, I’m impressed you got the value like that though, right on the money haha. MJXS 71 1 3 LM was the bees knees voltage regulator controller datashedt maybe also the only one readily available ‘way back when’.

There are two aspects to this. Sign up using Facebook. On the functional block diagram of thepin 9 is the output directly below a zener diode.

LM IC Pinout, Specifications, Equivalent & Datasheet

The Model T of the power transistor world. I understand that it is responsible for varying the voltage and regulating ithow is it accomplishing this? This will be compared to a sample of the Vout voltage.


This circuit is the first time I’ve seen it used in any schematic. I checked the km723h, and it has ohms from emitter to base i. It is a good question and datazheet on-topic. The new replacement had these two pins shorted internally.

Go above this and kaput! Power supply with LM Ask Question. It is designed primarily to be used as a positive regulator, but it can also be made to function as a negative regulator.

It’s the terminology that often confuses beginners. I can’t seem to replicate this behaviour so I suspect the interaction with the transistors is super important. If things go wrong and Vout is not as high as it should be due to a failure somewhere then Q1 tries to tear the arms off the ie apply too much base voltage – if the is tougher than Q1 then Q1 may lose instead. Q1 is driven on by the ”s output transistor and in turn it drives Q3.

Be sure Vin does not exceed 35V!. Also able to use as either linear or switching type lm723n. None the less, I’m going to look up the datasheet and give her a test. There may be other packages available from other manufacturers, but I limited my search to these three.

LMH/ from Texas Instruments

I am familiar with the but don’t think I’ve ever actually used one so now I’m going to look into them as well as an interim PS would be nice Views Read View source View history. For finding the value of output voltage for this circuit you can use the formula below:. I have seen another LM in almost the exact same setup elsewhere, but the site was in Russian. Post as a guest Name. If you change dstasheet in steps of 2.


You can parallel LM’s – ideally add a small output resistor between Vout and feedback resistor network to achieve current sharing. Secondly, apologies to those who feel this question wasn’t researched enough nor novel. The 2N was the logical choice of pass transistor, and as it was NPN you needed Q1 to invert the drive polarity and give current gain. Spehro Pefhany dtasheet 4 This is very much a design question and of great value to any who want to move beyond the “plug in a black box component” type of “design”.

Thank you for your response!

If you wanted current limit the arrangement used was simple obvious and standard fare. Sign up using Email and Password. Is Q1 an amplifying stage?

In which case, since the outputs “V,” how lm72h3 they get it from ?

I suspect you’ll find a collector-base short on Q4. To use this IC for the different range of required output voltage, you can proceed with various circuits available in LM datasheet with having your needed output range. However, I don’t understand:. Don’t know why your reply got downvoted, definitely of value. The metal can and the flat-pack do not have enough pins and so they skip this one.

Russell McMahon k 9 Is that due to pin 9 being grounded?