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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I’d like to repair this but more than anything, I’d like to know what I’m doing rather than just plugging in components. Also, Q1 is a transistor – which I’m sure was just a mistake.

Second, the input voltage must be at least 3. The Voltage Regulator Description: If it is a 1 Watt it might lm723u a long time. I understand lm723b it is responsible for varying the voltage and regulating ithow is it accomplishing this?

Frankly, assuming there are no shorts, the only thing that can kill Q1 is if Q4 is dead, and then only if you have a relatively low resistance load on the power supply. If you wanted to go to zero Vout you needed some cunning due to the non zero reference voltage so the upside down vatasheet polarity system was used.

Vin is divided down and stood on top of as “pedestal’ made from Vref scaled down by Vr and R5. What went into the design of that portion, especially with the feedback transistor?

The old one had 2 datashest the pins open while which were being used for voltage feedback sensing. Call ratio of R6: I can’t seem to replicate this behaviour so I suspect the interaction with the transistors is super important. LM was the bees knees voltage regulator controller and maybe also the only one readily available ‘way back when’.


What’s the purpose of this? Go above this and kaput! The error amplifier 4 5 inputs is used to compare a reference voltage with the voltage to be controlled. See at end for specific details of your circuit’s operation. First, the LM has a maximum allowable input voltage of 40 volts. Thank you for your response! You may find there are several data sheets available from different manufacturers. 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 When the load voltage across R10 exceeds about 0.

It is designed primarily to be used as a positive regulator, but it can also be made to function as a negative regulator. My response below suggests a plug-in choice: Sorry I can’t remember which pins. I checked theand it has ohms from emitter to base i.

Submitted by webmaster on 15 January If you change k in steps of 2. Post as a guest Name.

Just wanted to mention this for something to think about while troubleshooting. If you use a resistor datahseet turn the on and the to turn it off, the will need to be sinkig most of the current when idle and so must be used near its current rating often.

Voltage Regulator

The zener 10,9 provides a stable voltage that the output can pull down to. Be sure Vin does not exceed 35V!. My question is more to do with how the circuit itself operates because I’m not sure. I actually managed to figure out the datashheet 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.


I tested it with a 5-ohm power resistor.

Power supply with LM – Electrical Engineering Stack Exchange

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When you study the data sheets, you will see that you can use the LM “on its own”, though with a few necessary external resistors and capacitors. I have seen datzsheet LM in almost the exact same setup elsewhere, but the site was in Russian.

Most recently one of the transistors Q1 actually exploded on it. Q4 being a The LM internal error amp has 6. On the functional block diagram of thepin 9 is the output directly below a zener diode.

LMH/ from Texas Instruments

This is the conventional schematic symbol dqtasheet a voltmeter. For getting an output voltage range from 2v to 7v you can use the circuit below, which is a Basic Voltage Regulator circuit using LM voltage regulator IC. LM data sheet here. Spehro Pefhany k 4 In which case, since the outputs “V,” how do they get it from ?

National Semiconductor

Is that due to pin 9 being grounded? Thank you very much for your reply, this explains a lot in only a few lines. Retrieved from ” http: LM data sheet here LM pinout below. The current limit is crude in that it has no “foldback” action – it limits current AT 2A if you try to draw too much. Pin 6 provides a buffered reference voltage – the forerunner of a modern bandgap reference.