The LD is a series of low dropout positive voltage regulators The LD series includes a current limiting circuit and a trimmed band-gap reference. LDV 5a Low Drop Positive Voltage Regulator Adjustable And Fixed 5A LOW DROP POSITIVE Details, datasheet, quote on part number: LDV. The LD is a LOW DROP Voltage Regulator able to provide up to 5A of Output Current. Dropout is guaranteed at a maximum of V at the maximum output.

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That regulator requires 1. But if you can’t, leave the 12v rail as it is power directly from it for 12v applications.

LD1084V Datasheet

So put a load of about mA to mA on the 3. Datasyeet the reference design from the datasheet or sadly, since the LDadj does not really have a nice reference design like the LM, use the datasheet as a guideline.

Working with adjustable voltage regulators. Oh, and a huge heat sink.

STMicroelectronics LDV – PDF Datasheet – Linear Voltage Regulators In Stock |

Making a switching regulator to cover that wide an output range could be interesting. How would I go about boosting the available voltage?

For mine, I’m going to do some tests with a few heat sinks, with lr1084v small fan for forced air cooling. Also, move the higher current shottky rectifiers to the 12V datasheft. Modding the psu is a good idea. So what does all this mean. Panici Full Member Posts: Not sure about this series of chip, but the LM and LM78xx regulators can be damaged by this. I was looking at the LD Datasheet: I use a small finned sink and the metal case for cooling. Thanks for the advice guys. This prevents a situation happening where the output pin has a greater voltage on it than the input pin.


Worst case, 5A 1. For any voltage lower, use an lm or a switching reg, you could use a pass transistor and pass control of the regulated output to a transistor unless it’s a switching reg.

This is giving me the impetus to work on this project again. You will need to determine which control IC is on the board and let us know. Try googling for “FSP ” without the quotes. If it is a TL, it is quite a bit simpler as that chip has satasheet around for a very long time and is well documented. I’m not sure yet if it is really checking each one, or just feeding them all into a voltage divider so if any one output goes dead, it shuts down.

Newer power supplies regulate 3.

LD1084V Datasheet PDF

Test equipment, replica and original sci fi props and costume pieces, and whatever else I feel like at the time. I have ld10084v Ultimaker and a 3D engraver. Possible if you have an outside extra capacitance connected to the power supply, via some external circuit or you are experimenting with supercaps, and you turn the power supply off.

I’ve never worked with adjustable voltage regulators before, what supporting circuitry will I need to make this work? So the 12V output should put out 18V.

Back inI built a “very linear” based bench power supply le1084v a junkbox 30V transformer from my stash and a handful of parts. And it gets worse if you mod the PC supply to put out, for instance in my case 18V in order to get at least 15V at the highest point: The minimum output is 1. My plan is to rewire it so that the 3. Quite a lot of heat. It would be cool to be able to get v out of it.


Do you -really- need 0V output? Keep in mind, an unmodified PC power supply regulates the 3.

Then the power supply should boost the PWM so that the 3. Vo is the maximum, R2 will be the potentiometer. I really, really hate having a ld1084g and “fine” control, that is the mark of a cheap POS power supply. I’m in the process of modifying a PC power supply so that lld1084v puts out about 18V from the 12V output. The design was straight from the manufacturers datasheet. See page 6 of the datasheet. The only expensive item was a 5K ohm 10 turn potentiometer for voltage adjustment.

So I’ll need to spoof the other outputs back to the chip.

I have a half-dozen PC power supplies with that chip I’m figuring out how to mod, but haven’t had time to dig any deeper. I am going to use the same linear regulator, and use 10 turn potentiometers to adjust voltage and maximum current. If it is labeled “”, it gets more complex.