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

Newer power supplies regulate 3. For mine, I’m going to do some tests with a few heat sinks, with a small fan for forced air cooling. Vo is the maximum, R2 will be the potentiometer. Also, move the higher dtaasheet shottky rectifiers to the 12V output. If it is labeled “”, it gets more complex. So put a load of about mA to mA on the 3.

But if you can’t, leave the 12v rail as it is power directly from it for 12v applications. For any voltage lower, use datashwet 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. So the 12V output should put out 18V. Not sure about this series of chip, but the LM and LM78xx regulators can be damaged by this.


Darasheet you -really- need 0V output?

So I’ll need to spoof the other outputs back to the chip. Oh, and a huge heat sink. Modding the psu is a good idea. 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.

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That regulator requires 1. 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. Keep in mind, an unmodified PC power supply regulates the 3. This lr1084v giving me the impetus to work on this project again.

ST Microelectronics

Then the power supply should boost the PWM so that the 3. I am going to use the same linear regulator, and use 10 turn potentiometers to adjust voltage and maximum current. I really, really hate having a “coarse” and “fine” control, that is the mark of a cheap POS power supply. It would be cool to be able to get v out of it. The minimum output is 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.

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: Worst case, 5A 1. This prevents a situation happening where the output pin has a greater voltage on it than the input pin. Try googling for “FSP ” without the quotes. I’m in the process of modifying a PC power supply so that it puts out about 18V from the 12V output.


Quite a lot of heat.

Back inI built a “very linear” based bench power supply using a junkbox 30V transformer from my stash and a handful of parts. Working with adjustable voltage regulators. I use a small finned sink and the metal case for cooling. 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. See page 6 of the datasheet.

The only expensive item was a 5K ohm 10 turn potentiometer for voltage adjustment.

LDV Datasheet (PDF Download) 6/16 Page – STMicroelectronics

I have an Ultimaker and a 3D engraver. I’ve never worked with adjustable voltage regulators before, what supporting circuitry will I need to make this work? My plan is to rewire it so that the 3. The design was straight from the manufacturers datasheet. Making a datasheeet regulator to cover that wide an output range could be interesting.