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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Vo is the maximum, R2 will be the potentiometer. 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. Also, move the higher current shottky rectifiers to the 12V output. Quite a lot of heat. So the 12V output should put out 18V. This prevents a situation happening where the output pin has a greater voltage on it than the input pin. But if you can’t, leave the 12v rail as it is power directly from it for 12v applications.

Panici Full Member Posts: Try googling for “FSP ” without the quotes. You will need to determine which control IC is on the board and let us know. Newer power supplies regulate 3. 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?

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


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: Keep in mind, an unmodified PC power supply regulates the 3.

LDV 데이터시트(PDF) – STMicroelectronics

I use a small finned sink and the metal case for cooling. I was looking at the LD Datasheet: Then the power supply should boost the PWM so that the 3.

Not sure about this series of chip, but the LM and LM78xx regulators can be damaged by this. So what does all this mean. My plan is to rewire it so that the 3. I am going to use the same linear regulator, and use 10 turn potentiometers to adjust voltage and maximum current. How would I go about boosting the available voltage? It would be cool to be able to get v out of it.

I have a half-dozen PC power supplies with that chip I’m figuring out how to mod, but haven’t had time fatasheet dig any deeper.

So put a load of about mA to mA on the 3. This is giving me the impetus to work on this project again. I’m in the process of modifying a PC power supply so that it puts out about 18V from the 12V output. Working with adjustable voltage regulators. Making a switching regulator to cover that wide an output range could be interesting. So I’ll need to spoof the other outputs back to the chip.


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. If it is a TL, it is quite a bit simpler datasheft that chip has been around for a very long time and is well documented. That regulator requires 1. Test equipment, replica and original sci fi props and costume pieces, and whatever else I feel like at the time. I have an Ultimaker and a 3D engraver.

If it is labeled “”, it gets more complex. Do you -really- need 0V output?

LD1084V Datasheet PDF

The minimum output is 1. I really, really hate having a “coarse” and “fine” control, that is the mark of a cheap POS power supply. For mine, I’m going to do some tests with a few heat sinks, with a small fan for forced ddatasheet cooling. Oh, and a huge heat sink. Worst case, 5A 1. 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.

Modding the psu ls1084v a good idea. The design was straight from the manufacturers datasheet.