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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Try googling for “FSP ” without the quotes. 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. So I’ll need to spoof the other outputs back to the chip.

Do you ls1084v need 0V output? 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 control of the regulated output to a transistor unless it’s a switching reg.

How would I go about boosting the available voltage? So what does all this mean. But if you can’t, leave the 12v rail as it is power directly from it for 12v applications. Worst case, 5A 1. Test equipment, replica and original sci fi props and costume pieces, and whatever else I feel like datashheet the time.


You will need to determine which control IC is on the board and let us know. Then the power supply should boost the PWM so that le1084v 3. 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. That regulator requires 1.

The minimum output is 1. This is giving me the impetus to work on this project again. Vo is the maximum, R2 will be the potentiometer. Working with adjustable voltage regulators. Thanks for the advice guys. I’ve never worked with adjustable voltage regulators before, what supporting circuitry will I need to make this work? This prevents a situation happening where the output pin has a greater voltage on it than the input pin. Oh, and a huge heat sink.

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

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. 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.

My plan is to rewire it so that the 3. Also, move datashet higher current shottky rectifiers to the 12V output.

For mine, I’m going to do some tests with a few heat sinks, with a small fan for forced air cooling. Not sure about this series of chip, but the LM and LM78xx regulators datasheef be damaged by this. 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.


Keep in mind, an unmodified PC power supply regulates the 3. So the 12V output should put out 18V. Quite a lot of heat. I use a small finned sink and the metal case for cooling. 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.

LD1084V Datasheet

Newer power supplies regulate 3. I have an Ultimaker and a 3D engraver. Making a switching regulator to cover that wide an output range could be interesting. Modding the psu is a good idea. 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. Panici Full Member Posts: 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: I was looking at the LD Datasheet: The design was straight from the manufacturers datasheet.

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

It would be cool to be able to get v out of it. See page 6 of the datasheet. The only expensive item was a 5K ohm 10 turn potentiometer for voltage adjustment.