LM, LMA, LM, LM, LM SNOSBT0L –FEBRUARY – REVISED SEPTEMBER LM, LMA and LM Family Wide VIN. LM 3-terminal 1A Positive Voltage Regulator DESCRIPTION. The UTC LM78XX family is monolithic fixed voltage regulator integrated circuit. They are. LM Positive +15v Voltage Regulator. LM Positive +15v Voltage Regulator. Price: $ Datasheet: application/pdf icon LMpdf. LM + 15v.
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Hello all, I am working on a power supply board which has produces 15V, lm78815 24V outputs. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. I’m using one lm7185 a TIA with over dB of gain and power supply noise is not an issue. Join your peers on the Internet’s largest technical engineering professional community.
I can do anything. Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor. Register now while it’s still free! With that much drop and assuming more than a few tens of milliamps in currentI would use a buck converter and save a ton of power.
LM Positive +15v Voltage Regulator | NightFire Electronics LLC
Otherwise, use a zener as suggested, or even put another with a 15V zener in the ground leg makes for a 30 volt regulator ahead of the for the 15V. Can you feed the 15v and 5V regulators from the 24V regulator output? Does anyone lj7815 any ideas? I’m perplexed why you might use a buck converter for the 24V, but not the Not very elegant but it works and it moves the problem from lm78815 exotic 40 V parts to handling the heat produced in the zener.
Dan – Owner http: The Eng-Tips staff will check this out and take appropriate action. At first he had a part in lm78155 that he used back at college – it was a similar buck regulator, but its switching transients were so bad that it required an awful LC filter on the output to keep it stable and useable I have seen a high voltage version of the LM that can do up to 60Vin, I may try to use that if I have to, but we’re trying not to have to modify this board any more to fit the extra components required for an adjustable regulator.
You could then stick with the LM Red Flag This Post Please let us know here why this post is inappropriate.
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LM Positive Voltage Regulator +15v 1A TOAB
We were thinking of using a 30V zener diode to bring the voltage back down, though it would be nice if we didn’t need to. Such issues are the result of project complexity, size, uniqueness and regulation, as well as the need for virtual team collaboration.
I pulled the 15V regulator out of the board on order to use a separate 15V lab power supply to measure the current draw. Hi roydm; a missed point here by a lot of folks was “drop-in replacement so no board cycle would be needed”. It could come in handy someday. I need one that is rated for 40VDC or higher.
LM7815 / L7815 / 7815
So far all I could find is the Fairchild KA78T15 regulator, which WOULD be perfect, however from what I’ve been able to tell its an obsolete part and only Rochester Electronics is selling those parts and this board is expected to last 10 years, so we don’t want to be limited to one supplier. Close this window and log in. By joining you are opting in to receive e-mail. I am hesitant to do this since it may produce unwanted transients into the circuitry that runs off the 15V rail.
I shall put that PDF in my “interesting parts” directory. If your 15V load current is fairly fixed you can proceed the regulator with a power resistor to skim off half the voltage on a ‘dumb’ part instead of toasting the semiconductor regulator. Also I tested a few of our zener’s in stock and the best onewe had was only 1. I don’t know how much spare capacity is on the 24V rail. I had forgotten when I originally posted this that the 24V rail gets turned on separately since its for a completely different circuit and can’t be used with the Promoting, selling, recruiting, coursework and thesis posting is forbidden.
I used a couple of them in a doorbell camera project I did a few years back.
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That will remove voltage that would otherwise be ‘seen’ be the regulator. How about two s in series. Keith Cress kcress – http: You don’t need a heatsink and they are fully protected, so even if you short the output they won’t burn up.
Need a 40V input rated version of the lm regulator. Are you an Engineering professional? Does anyone know of a 15V fixed output 3 terminal regulator that can handle up to 40V or more input voltage, preferably in the to package? I have saved my bacon from being fried by using a power zener in series with the input. Resources Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor.
Hahaha, yeah goodness I didn’t know such things existed either! The circuit draws mA at max load. Sounds like you might end up with a smoking crater in the board anyway. There is a homework forum hosted by engineering. Now I’m currently in the process of probing the board and trying to catch any issue that may be caused lm78815 the switching transients on the power rails. Click Here to join Eng-Tips and talk with other members!
Best bet is the LM What we did instead was we found a drop in replacement buck regulator on digikey: