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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I’m in the process of modifying a Ld1084b power supply so that it puts out about 18V from the 12V output. Then the power supply should boost the PWM so that the 3. That regulator requires 1.

LD1084V Datasheet PDF

Back inI built a “very linear” based bench power supply using a junkbox 30V transformer from my stash and a handful of parts. If it is labeled “”, it gets more complex.

The design was straight from the manufacturers datasheet. Build the reference design from the datasheet or sadly, since the LDadj does not datadheet have a nice reference design like the LM, use the datasheet as a guideline.

Test equipment, replica and original sci fi props and costume pieces, and whatever else I feel like at the time. So put a load of about mA to mA on the 3. 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.


It would be cool to be able to get v out of it. 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.

I’ve never worked with adjustable voltage regulators before, what supporting circuitry will I need to make this work? Not sure about this series of chip, but the LM and LM78xx regulators can be damaged by this.

The only expensive item was a 5K ohm 10 turn potentiometer for voltage adjustment. I am going to use the same linear regulator, and use 10 turn potentiometers to adjust voltage and maximum current. 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: So what does all this mean.

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. For any datasyeet 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. 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 dtasheet.


Also, move the higher current shottky rectifiers to the 12V output. Oh, and a huge heat sink. Working with adjustable voltage regulators. For mine, I’m going to do some tests with a few heat sinks, with a small fan for forced air cooling. Keep in mind, an unmodified PC power supply regulates the 3.

This prevents a situation happening where the output lx1084v has a greater voltage on it than the input pin.

LDV Datasheet(PDF) – STMicroelectronics

Panici Full Member Posts: Thanks for the advice guys. But if you can’t, leave the 12v rail as it is power directly from it for 12v applications. The minimum output is 1.

This is giving me the impetus to datxsheet on this project again. Worst case, 5A 1. Try googling for “FSP ” without the quotes. So I’ll need to spoof the other outputs back to the chip.