August 25, 2021 0 Comments

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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The only expensive item was a 5K ohm 10 turn potentiometer for voltage adjustment. So I’ll need to spoof the other outputs back to the chip. Making a switching regulator to cover that wide an output range could fatasheet interesting. If it is labeled “”, it gets more complex.

I was looking at the LD Datasheet: So what does all this mean. Vo is the maximum, R2 will od1084v the potentiometer. Try googling for “FSP ” without the quotes. Back inI built a “very linear” based bench power supply using a junkbox 30V transformer from datahseet stash and a handful of parts. 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: Do you -really- need 0V output?

Also, move the higher current shottky rectifiers to the 12V output. Thanks for the advice guys. Keep in mind, an unmodified PC power supply regulates the 3. Test equipment, replica and original sci fi props and costume pieces, and whatever else I feel like at the time. Panici Full Lr1084v Posts: So the 12V output should put out 18V.


For mine, I’m going to do some tests with a few heat sinks, with a small fan for forced air cooling. It would be cool to be able dataasheet get v out of it. Working with adjustable voltage regulators. Worst case, 5A 1.

Newer power supplies regulate dahasheet. I really, really hate having a “coarse” and “fine” control, that is the mark of a cheap POS power supply.

Working with adjustable voltage regulators

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 ld10844v supply off. 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.

So put a load of about mA to mA on the 3. The minimum output is 1.

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

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.

Oh, and a huge heat sink. This prevents a situation happening where the output pin has a greater voltage on it than the input pin.

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. But if you can’t, leave the 12v rail as it is power directly from it for 12v applications. Modding the psu is a good idea. This is giving me the impetus to work on this project again. How would I go about boosting the available voltage? If it is a TL, it is quite a bit simpler as that chip has been around for a very long time and is ld104v documented.


My plan is to rewire it so that the 3.

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. 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.

I’m in the process of modifying a PC power supply so that it puts out about 18V from the 12V output. See page 6 of the datasheet. 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.

ST Microelectronics

Quite a lot of heat. I use a small finned sink and the metal case for cooling. I have an Ultimaker and a 3D engraver. Then the power supply should boost the PWM so that the 3. That regulator requires 1. You will need to determine which control IC is dztasheet the board and let us know.