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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Vo is the maximum, R2 will be the potentiometer.

Then the power supply should boost the PWM so that the 3. If it is labeled “”, it gets more complex.

LDV Datasheet (PDF Download) 10/16 Page – STMicroelectronics

Back inI built a “very linear” based bench power supply using a junkbox 30V transformer from my stash and a handful of parts. The design was straight from the manufacturers datasheet. Worst case, 5A 1. My plan is to rewire it so that the 3. This prevents a situation happening where the output pin has a greater voltage on it than the input pin. I’m in the process of modifying a PC power supply so that it puts out about 18V from the 12V output.

This is giving me the impetus to work on this project again. Keep in mind, an unmodified PC power supply regulates the 3. If it is a TL, it is quite a bit simpler as that chip has been around for a very long time and is well documented. For mine, I’m going to do some tests with a few heat sinks, with a small fan for forced air cooling.


I have an Ultimaker and a 3D engraver. I really, really hate having a “coarse” and “fine” control, that is the mark of a cheap POS power supply. Newer power supplies regulate 3. 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: Quite a lot of heat. Try googling for “FSP ” without the quotes.

Making a switching regulator to cover that wide an output range could be interesting. Also, move the higher current shottky rectifiers to the 12V output. Modding the psu is a good idea. 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. See page 6 of the datasheet. 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.

Working with adjustable voltage regulators. You will need to determine which control IC is on the board and let us know.

LD1084V Datasheet PDF

Not sure about this series of chip, but the LM and LM78xx regulators can be damaged by this. Test equipment, replica and original sci fi props and costume pieces, and whatever else I feel like at the time.

Oh, and a huge heat sink. I’ve never worked with adjustable voltage regulators before, what supporting circuitry will I need to make this work? Build 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. How would I go about boosting the available voltage? Thanks for the advice guys.


I am going to use the same linear regulator, and use 10 ld1084c potentiometers to adjust voltage and maximum current. I was looking at the LD Datasheet: 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. Panici Full Member Posts: So the 12V output should put out 18V. The minimum output is 1.

LD1084V Datasheet

So put a load of about mA to mA on the 3. The only expensive item was a 5K ohm 10 turn potentiometer for voltage adjustment. But if you can’t, leave the 12v rail as it is power directly from it for 12v applications.

So what does all this mean. It would be cool to be able to get v out of it. Do you -really- need 0V output? 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 use a small finned sink and the metal case for cooling. That regulator requires 1.

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