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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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Keep in mind, an unmodified PC power supply regulates the 3.

Working with adjustable voltage regulators

See page 6 of the datasheet. It would be cool to be able to get v out of it. My plan is to rewire it so that the 3. Making a switching regulator to cover that wide an output range could be interesting.

Thanks for the advice datashet. So I’ll need to spoof the other outputs back to the chip. I have an Ultimaker and a 3D engraver. So the 12V output should put out 18V. You will need to determine which control IC is on the board and let us know.

LD1084V Datasheet PDF

Test equipment, replica and original sci fi props and costume pieces, ldd1084v whatever else I feel like at the time. Newer power supplies regulate 3. If it is labeled “”, it gets more complex.

Back inI built a “very linear” based bench power supply using a junkbox 30V transformer from my stash and a handful of parts. For any voltage lower, use an lm or a switching reg, you could use a pass transistor and pass datzsheet of the regulated output to a transistor unless it’s a switching reg.


Try googling for “FSP ” without the quotes. 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. For mine, I’m going to do some tests with a few heat sinks, with a small fan for forced air cooling. This is giving me the dayasheet to work on this project again. Quite a lot of heat.

LDV Datasheet(PDF) – STMicroelectronics

Panici Full Member Posts: The only expensive item was a 5K ohm 10 turn potentiometer for voltage adjustment. The design was straight from the manufacturers datasheet. I was looking at the LD 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.

Modding the ld10084v is a good idea. This prevents a situation happening ld0184v the output pin has a greater voltage on it than the input pin.

So put a load of about mA to mA on the 3. I really, really hate having a “coarse” and “fine” control, that is the mark of a cheap POS power supply.

ST Microelectronics

I’ve never worked with adjustable voltage regulators before, what supporting circuitry will I need to make this work? 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. How would I go about boosting the available voltage? Not sure about this series of chip, but the LM and LM78xx regulators can be damaged by this. I use a small finned sink and the metal case for cooling.


I’m in the process of modifying a PC power supply so that it puts out about 18V from the 12V output. 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. 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.

Then the power supply should boost the PWM so that the 3.

Oh, and a huge heat sink. Do you -really- need 0V output? Working with adjustable voltage regulators.

I am going to use the same linear regulator, and use 10 turn potentiometers to adjust voltage and maximum current. Vo is the maximum, R2 will be the potentiometer. 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. That regulator requires 1. Also, move the higher current shottky rectifiers to the 12V output. Worst case, 5A 1. 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.