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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If it is a 1 Watt it might last a long time.

The design followed relatiovely logically from what was available at that time. With 35V in you can get about 1. Unless I am missing it, I don’t see a zener diode on that schematic anywhere. If you wanted to go to zero Vout you needed some cunning due to the non zero reference voltage so the upside down pot polarity system was used. So how do the transistors function? Sign up using Facebook. The zener 10,9 provides a datasheett voltage that the output can pull down to.

Most transistors “explode” in datwsheet situations because they are connected wrong.

Power supply with LM – Electrical Engineering Stack Exchange

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. I’ve added DIP pin numbers as those match what you show.

LM data sheet here LM pinout below. 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.


This is a design from the dawn of solid state time that has much to teach. That increases the base current through Q1, which pulls up the base of the parallel?

The problem was traced to the 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. Just wanted to mention this for something to think about while troubleshooting. Vin is divided down and stood on top of as “pedestal’ made from Vref scaled down by Vr and R5.

Q4 being a If you need to repair this circuit with original components then it will be possible to do so.

Pin configuration Pin No. This will be compared to a sample of the Vout voltage. Is that due to pin 9 being grounded? The zener diode I refer to is in the function block diagram of the datasheet and refers to zener voltage Vz out of pin 9.

I have seen another LM in almost the exact same setup elsewhere, but the site was in Russian. There are two aspects to this.

National Semiconductor

TL — Programmable Reference Voltage. 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. That sort of thing. Go above this and kaput! Get each one catasheet they usually contain the same information presented in different ways. A will probably survive that if the heatsink is good enough.


I have a basic grasp on their operation, getting more familiar with small signal characteristics, etc, but besides knowing the is the pass transistor and power transistor, that’s about it. It can able to provide a higher range of output voltage and current up to 10A by simply adding a series pass transistor with it, with having a wider range of operating temperature so the Dtasheet able to withstand for long.

What’s the purpose of this? Easier still, you can get LM’s that provide up to about 1. Votes to close are disappointing.

Voltage Regulator

In which case, since the outputs “V,” how do they get it from ? Secondly, apologies to those who feel this question wasn’t researched enough nor novel.

This page has been accessed 30, times. You can parallel LM’s – ideally add a small output resistor between Vout and feedback resistor network to achieve current sharing. Sign up using Email and Password. With booster transistors you can increase the LM’s useful output current range to several amps.

The LM internal error amp has 6.