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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A was used to regulate the HV output 15KV. The circuit is MUCH easier to understand if you draw it with the internals shown and arrange it around the in logical fashion. The Model T of the power transistor world.

Hard to know what to conclude from this: I’m not overly familiar with such things but I suspect it was probably standard practice in that day. Does it imply there darasheet actually two transistors connected in parallel? I am just datazheet through all the responses now.

National Semiconductor

The datashest being a very curious designation. If you need to repair this circuit with original components then it will be possible to do so. The metal can and the flat-pack do not have enough pins and so they skip this one. There may be other packages available from other manufacturers, but I limited my search to these three.

This circuit is the first time I’ve seen it used in any schematic.

Voltage Regulator

See at end for specific details datssheet your circuit’s operation. I know for sure the is okay and funnily enough discovered 3 out of 4 new ones I bought are nonfunctional.


The design followed relatiovely logically from what was available at that time. So how do the transistors function? But again, all with certain limitations. 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 To get more output voltage you need to use “booster” transistors.

This page has been accessed 30, times. Secondly, apologies to those who feel this question wasn’t researched enough nor novel. On lk723h functional block diagram of thepin 9 is the output directly below a dattasheet diode. I checked theand it has ohms from emitter to base i.

Email Required, but never shown. It’s the terminology that often confuses beginners. I’m quite lost after spending some time monkeying with this, so any direction is greatly appreciated.

LMH datasheet & applicatoin notes – Datasheet Archive

With the voltage turned right down of course. Above I named the ratio of R6: Then study the example application circuits given in it. Spehro Pefhany k 4 This can be helpful if you are a beginner trying to decipher the terminology. Agreed – the inverting pin is fed by a very “interesting” arrangement – in fact that’s the exact part that confuses me besides the Vz being pulled to ground.

The current limit works by dropping voltage across R It is a pin IC that needs some outboard components to tell it what to do.

None the less, I’m going to look up the datasheet and give her a test. Call ratio of R6: Several companies manufacture the LM, but the data sheets are pretty much the same. In which case, since the outputs “V,” how do they get it from ? Above formula gives this graph. Is Q1 an amplifying stage? Sign up using Email and Password.


For 2A current limit R10 is about 0. The new replacement had these two pins shorted internally. It acts to produce 6. That sort of thing. 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. LM was the bees knees voltage regulator controller and maybe also the only one readily available ‘way back when’.

Views Read View source View history. Don’t worry, this question won’t stay closed. To those of you who have offered assistance thank you very kindly for your time. All the zener does in the diagram there is provide a stable voltage between pins 9 and 10, correct? Sorry for the barrage of questions, answer at your earliest convenience.

I will try to search more thoroughly next time before asking. 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. I understand that it is responsible for varying the voltage and regulating ithow is it accomplishing this?

However, I don’t understand:.