LM 3-terminal 1A Positive Voltage Regulator DESCRIPTION. The UTC LM78XX family is monolithic fixed voltage regulator integrated circuit. They are. lm are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for lm LM datasheet, LM circuit, LM data sheet: FAIRCHILD – 3- TERMINAL 1A POSITIVE VOLTAGE REGULATORS,alldatasheet, datasheet.

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Hi David, It would be interesting to know which devices you were testing at the time. Be careful not to change the GND wiring pattern of any external components, either. datssheet

That is not correct, the uses a surface zener, and is fairly noisy. Hi Ancel, It is finally approaching End of Life. The difference of 8W will be dissipated in the regulator. The is one of those designs. Some designs are so well done that they are timeless. On Sun, Jun 25, at 8: So you won’t find a parameter “minimum input voltage”, but it is mentioned as a condition for proper operation within certain limits.

All parameters are specified under certain conditions, and for the output voltage we can see that the condition is that the input voltage is minimum That’s significantly better than a lot dattasheet ‘precision’ volt references.

When using both small signal and large current GND patterns, it is recommended to isolate the two ground. From the above it may look like you best make your input voltage a lot higher than the 12V output, but that’s not true.

LM Datasheet(PDF) – Unisonic Technologies

The same process can work with the LM for more current as they also have a negative tempco viz. The more elegant way is thewhich can do both CC and CV simultaneously datasheeh well as fold-back. Damage to the internal circuit or element may occur when the polarity of the V CC pin is opposite to that of. Linear regulators are different.

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But since there’s this voltage drop the input voltage has to be higher than the output voltage. As Brian pointed its long life was probably due in part to its rich set of capabilities some of which you cannot get in a “more modern” regulator.

Price is reasonable and they can do floating regulation. On Sunday, June 25, 4: What was the datazheet number? Even though the typical dropout voltage is 2 volts, you should use the maximum value in your design.

Isn’t the kinda obsolete? It l7810 a buried Zener reference, so is capable of pretty low noise compared to most newer, easier to use three-terminal ones with bandgap references.

On page 6 of the datasheet, the maximum dropout voltage Vd is listed as 2. Some variants actually use a bandgap reference instead of a zener. Temperature Coefficient of Vo.

PDF LM7810 Datasheet ( Hoja de datos )

They are suitable for applications that required. Subject of the new topic: If we look further we can see two values for line regulation; it appears dataseet this is best if the input voltage is at least 16V. Search Only Within This Topic. I am hoping to develop a device that can qualify and ‘bin’ the LMs so that I can batch them out for my applications.

Dennis Tillman W7PF toggle quoted message. This is a snapshot of page Regarding linear power supplies ST electronics used to make an LM variant that appeared to have lower noise than the standard and the schematic indicated that a bandgap reference was used.

Dean 4, 22 57 Jim Thompson may have designed some of the different versions. The maximum dropout voltage Vd is 2. My pet peeve is the cost of spec’d voltage references and the added circuitry they require when working with circuits that need a decent reference and also can use that same reference as the Vcc. I prefer it to almost anything else for positive supplies up to mA, for low noise analog and digital circuits.


The LM78xx has datasheet around forever and I would guess it’s specs have not changed since it was introduced. A thermistor is involved. A is a linear regulator, and does not step up the input voltage if the input is below the output for that you need a DC-DC boost regulator.

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Your email is included with the abuse report. But I suppose the output voltage of the 7×12 regs could not be guaranteed as accurately “out of the box” Ln7810 electronics used to make an LM variant that appeared to have lower noise than the standard and the schematic indicated that a bandgap reference was used.

minimum input voltage? – Electrical Engineering Stack Exchange

This cannot be undone. I still have a fair amount of work to do to qualify my process, but I hope to provide a DIY kit to deliver the capability to profile the voltage regulator and supply the required component values to make the precision hold over the temp.

Jun 26, They are like a variable series resistor between input and output, causing a voltage drop across the regulator. The current to your load flows through the regulator and is the same current as will be drawn from the input voltage. The is a classic, and still very useful.