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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What we did instead was we found a drop in replacement buck regulator on digikey: How about two s in series.
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 I’ll be taking a better look at the switching transients on the rails tomorrow to see if they’re causing me any issues. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. I’m going to reqire a lot more SNR before I’ll move back to a linear supply.
I think you’re SOL. Those DC-DC converters have been around for years and are amazing. Now I’m currently in the process of probing the board and trying to catch any issue that may be caused by the switching transients on the power rails.
Hi roydm; a missed point here by a lot of folks was “drop-in replacement so no board cycle would be needed”.
Does anyone know of a 15V fixed output 3 terminal regulator that can l,7815 up to 40V or more input voltage, preferably in the to package? Hello all, I am working on a power supply board which has produces 15V, and 24V outputs. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. Current requirements aren’t too high, mA would probably suffice.
LM7815 Positive +15v Voltage Regulator
I’m perplexed why you might use a buck converter for the 24V, but not the 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 lm78155 board any more to fit the extra components required for an adjustable regulator. Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor.
Translation Assistance for Engineers Of course I can. Dan – Owner http: I’m using one on a TIA with over dB of gain and power supply noise is not an issue.
National Semiconductor – datasheet pdf
I don’t know how much spare capacity is on the 24V rail. It could come in handy someday. The TL runs out-of-regulation sometimes with insufficient input to output headroom when the 28V input is at absolute minimun but it has done the job for several years in a product. Sounds like you might end up with a smoking crater in the board anyway. The circuit draws mA at max load. The transformer we’re using outputs roughly VDC unfiltered which gets sent into a lm regulator to make the 15V output, we lm78115 use a transformer with lower output because we need the higher voltage to feed the buck regulator which outputs 24V.
Register now while it’s still free! You could then stick with the LM Resources Few production environments have the luxury of ordering new equipment to replace existing machines on their shop floor. You don’t need a heatsink and they are fully protected, so even if you short the output they won’t burn up. I used a couple of them in a doorbell camera project I did a few years back.
Can you feed the 15v and 5V regulators from the 24V regulator output? A string of 1Nx can also be used.
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.
Such issues are ln7815 result of project complexity, size, uniqueness and regulation, as well as the need for virtual team collaboration.
The Eng-Tips staff will check this out and take appropriate action. Red Flag This Post Please let us know here why this post is inappropriate. 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. Students Click Here Join Us! Does anyone have any ideas? Thanks for the lesson zapped! I have saved my bacon from being fried by using a power zener in series with the input.