August 13, 2019 posted by

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. For mine, I’m going to do some tests with a few heat sinks, with a small fan for forced air cooling.

LDV 데이터시트(PDF) – STMicroelectronics

Vo is the maximum, R2 will be the potentiometer. So put a load of about mA to mA on the 3. So the 12V output should put out 18V. The minimum output is 1. Build the reference design from the datasheet or sadly, since the LDadj does not really have a nice datashset design like the LM, use the datasheet as a guideline.

The design was straight from the manufacturers datasheet. I am going to use the same linear regulator, and use 10 turn potentiometers to adjust voltage and maximum current. Panici Full Member Posts: Making a switching regulator to cover that wide an output range could be interesting. Working with adjustable voltage regulators.

So what does all this mean. 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. If it is labeled “”, it gets more complex. Oh, and a huge heat sink. Also, move the higher current shottky rectifiers to the 12V output. Then the power supply should boost the PWM so that the 3.


I have an Ultimaker and a 3D engraver. 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.

ST Microelectronics

This prevents a situation happening where the output pin has a greater voltage on it than the input pin. Keep in mind, an unmodified PC power supply regulates the 3. I’m in the process of modifying a PC power supply so that it puts out about 18V from the 12V output. Modding the psu is a good idea. 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: Not sure about this series of chip, but the Dafasheet and LM78xx regulators can be damaged by this.

So I’ll need to spoof the other outputs back to the chip. Thanks for the advice guys. I really, really hate having a “coarse” and “fine” control, that is the mark of a cheap POS power supply. I’ve never worked with adjustable voltage regulators before, what supporting circuitry will I need to make this work?

This is giving me the impetus to work on this project again. For any voltage lower, use an lm or a dtasheet reg, you could use a pass transistor and pass control of the regulated output to a transistor unless it’s a switching reg.


I use a small finned sink and the metal case for cooling.

LD1084V Datasheet PDF

Do you -really- need 0V output? I was looking at the LD Datasheet: Back inI built a “very linear” based bench power supply using a junkbox 30V transformer from my stash and a handful of parts. I have a half-dozen PC power supplies with that chip I’m figuring out how to mod, ld1084f haven’t had time to dig any deeper. Quite a lot of heat. Worst case, 5A 1. 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.

My plan is to rewire it so that the 3. Newer power supplies regulate 3.

How would I go about boosting the available voltage? See page 6 of the datasheet. You will need to determine which control IC is on the board and let us know. But if you can’t, leave the 12v rail as it is power directly from it for 12v applications.

The only expensive item was datxsheet 5K ohm 10 turn potentiometer for voltage adjustment. It would be cool to be able to get v out of it. That regulator requires 1.

Test equipment, replica and original sci fi props and costume pieces, and whatever else I feel like at the time.