LED Driver alternative

Avo Mk8 · Dec 10, 2022

cireland said:
Would this work?

Osram OT 90/220-240/700 3DIMLT+E - LED accessories

www.ledeshop.net

Yes I think it would. Also it's likely that the programming resistor from the old one could be transferred to this. But I don't know if any of the other control terminals, Dali etc. need to be left disconnected (or not) once the o/p current is set.

But it's not in stock!

plugsandsparks · Dec 10, 2022

KAZ786 said:
Thank you all again for your time on this matter.

These are coming up in the £50.00 range, is this cheap, and why the 500ma over 700ma?

what do you recon on the following;

LPC-100-700 | MEAN WELL LED Driver, 72 → 143V Output, 100.1W Output, 700mA Output, Constant Current | RS

uk.rs-online.com

OT-FIT-75/220-240/700-D-LT2-UF-L | Osram LED Driver, 54 → 240V Output, 75W Output, 0.15 → 0.7A Output, Constant Current | RS

uk.rs-online.com

OT-FIT-75/220-240/550-D-NFC-L | Osram LED Driver, 54 → 216V Output, 75W Output, 0.125 → 0.55A Output, Constant Current | RS

uk.rs-online.com

OT-FIT-100/220-240/750-D-NFC-L | Osram LED Driver, 54 → 216V Output, 100W Output, 0.25 → 0.75A Output, Constant Current | RS

uk.rs-online.com

500mA is less than 600mA so not going to stress the LEDS,

Tridonic Linear Outdoor LCO 75W LED Driver fixC L SNC2 (500mA)

A fixed output built-in LED driver providing a 500mA output current at a 92% efficiency. This driver was designed for luminaires of protection class I.

www.bltdirect.com

thats a good price

Avo Mk8 · Dec 10, 2022

This one might just do:

75W Osram Optotronic Programmable LED Driver 35-115V

Optotronic 1DIM NFC outdoor driver by Osram can be used to produce a 35-115V and run to a power of 75 watts maximum. Ideal for industrial application.

www.bltdirect.com

And there is a beefier version at a bit more money.
I'm not sure if it will work out of the box without being (NFC) programmed first! The current is set with a resistor as per the original one. There's loads of technical info on the above website but I haven't looked through it all.

KAZ786 · Dec 10, 2022

Tridonic Linear LED Driver LC 75W 250-550mA flexC lp EXC Tridonic 28001808

Shop the Tridonic Linear LED Driver LC 75W 250-550mA flexC lp EXC, model number 28001808. Enjoy reliable and efficient performance for your lighting needs.

www.bltdirect.com

Any thoughts on above

Avo Mk8 · Dec 10, 2022

KAZ786 said:
Tridonic Linear LED Driver LC 75W 250-550mA flexC lp EXC Tridonic 28001808

Shop the Tridonic Linear LED Driver LC 75W 250-550mA flexC lp EXC, model number 28001808. Enjoy reliable and efficient performance for your lighting needs.

www.bltdirect.com

Any thoughts on above

Looks good to me. Gives 550mA with current selecting resistor of 0 ohms, ie a link, so you don't need to buy a programming resistor! Seems good to go.
Only think I didn't see was anything about isolation of the output from the mains input, but I think it's implied.
Try one!

plugsandsparks · Dec 10, 2022

If you are going for that type of form factor (they would typical be inside a linear light fitting, then why not

Tridonic Non-SELV 100W Constant Current LED Driver (250-700mA)

An IP20 rated constant current LED driver from the Tridonic EXCITE Non-SELV series. This driver is IP20 rated and has an adjustable output current between 250 and 700mA.

www.bltdirect.com

8.33K resistor gives 600mA same minimum voltage so no downside

Lucien Nunes · Dec 11, 2022

E2A: see posts below, the following might be incorrect due to the differences between Gen 1 & 2 configuration.

I am not convinced that the LED is presently running at 605mA. The Osram LEDset guide gives the resistor value as:
Rset [Ω] = (5 V/Iout [A]) x 1000
For 605mA that would be 8.3kΩ and although I can't see the colours on that resistor clearly enough to say what the value is, it doesn't look like 8.2 kΩ. The band that Brian sees as green, I see as blue, which would make it 16kΩ leading to a lamp current of 310mA, i.e. it might be significanly underrun (which could be a factor in the LEDs all outlasting the drivers.) I would want to double-check that before choosing an alternative driver.

brianmoooore · Dec 11, 2022

Lucien Nunes said:
The band that Brian sees as green, I see as blue, which would make it 16kΩ leading to a lamp current of 310mA,

I see that band as a blueish green or a greenish blue. Could be either TBH, but 15k is the standard value, although 16k is in the E24 series, of course.
It's definitely one or the other.

Avo Mk8 · Dec 11, 2022

Lucien Nunes said:
I am not convinced that the LED is presently running at 605mA. The Osram LEDset guide gives the resistor value as:
Rset [Ω] = (5 V/Iout [A]) x 1000
For 605mA that would be 8.3kΩ and although I can't see the colours on that resistor clearly enough to say what the value is, it doesn't look like 8.2 kΩ. The band that Brian sees as green, I see as blue, which would make it 16kΩ leading to a lamp current of 310mA, i.e. it might be significanly underrun (which could be a factor in the LEDs all outlasting the drivers.) I would want to double-check that before choosing an alternative driver.

Thank you Lucien for the cautionary words.

The formula you use above is for Osram "Gen 2" devices.
But the OP's part number I think indicates a Gen 1 device according to the Osram bumf?
See below - I'm not clear if this changes anything or not - your thoughts would be appreciated please.

[ElectriciansForums.net] LED Driver alternative

Lucien Nunes · Dec 11, 2022

Good spot, I think you're right and I've edited the above post. Can we discover the relationship of resistor to current for Gen. 1 drivers?

Avo Mk8 · Dec 11, 2022

Lucien Nunes said:
Good spot, I think you're right and I've edited the above post. Can we discover the relationship of resistor to current for Gen. 1 drivers?

I found this (description! of link in my post #7) see below:
My attempts at unravelling this from the 274uA current, (presumably from 12V) - and I really haven't understood this - suggested someting like 7V across Rset, which would be driving the lamp a bit over 400mA.

Post crossed with yours Lucien!
I thought I had worked out the source impedance of the 274uA and I had a potential divider of that and Rset which led to a voltage across Rset that I mention above.
Clearly something wrong with that!! Yes - it's a constant current source DUH! Prefer your version.

Lucien Nunes · Dec 11, 2022

Oops, post crossed with yours.

It seems the Gen1 interface sets the fraction of the rated output current, not the absolute current, in the relationship: Iout = Inom ((Vset-1)/9). Vset can be derived from an active voltage source in a remote control, optionally referenced to the driver's +12V aux supply, or can be created passively by a resistor driven by a constant 274μA bias current that flows out of the control terminal. Thus for a 16kΩ resistor:
Vset = 274μ * 16k = 4.4V
Iout = 700 * ((Vset-1)/9) = 263mA

That's an even lower fraction of the panel's rating and is starting to sound unlikely.

To set a Gen1 driver of 700mA rating to 605mA with a resistor, one would need:
Vset = 605/700 * 9 +1 = 8.8V
Rset = Vset/274μ = 32kΩ or 33kΩ as the nearest preferred value.

Perhaps we are not seeing the colours on the resistor correctly, but I can't resolve them to anything like 33kΩ

KAZ786 · Sep 27, 2024

hi,

coming back to this after a couple of years;
resistor colors are as follows Orange,blue, black,red, brown

Tridonic Linear Outdoor LCO 75W LED Driver fixC L SNC2 (500mA)

A fixed output built-in LED driver providing a 500mA output current at a 92% efficiency. This driver was designed for luminaires of protection class I.

bltdirect.com

Is this still an option

Avo Mk8 · Sep 27, 2024

KAZ786 said:
resistor colors are as follows Orange,blue, black,red, brown

The resistor value appears to be 36K 5%, a little off Lucien's 33K sum above.
If it is 36K, I calculate it's programming the power supply to produce 684mA, somewhat over the target 605mA.
Maybe that's why lamps were suffering?

KAZ786 said:
Is this still an option

Yes I think so.

The Tridonic driver will give 500mA so the lamps will produce a little less light output, but they ought to last longer!

plugsandsparks · Sep 27, 2024

Sadly these drivers are now discontinued, been looking for a couple of 100W versions and had to resort to Ebay.
The replacements are current set by NFC programming which you can get done but there is a charge. No sure of the available steps and you may get closer to 600mA rather than settling for 500mA
If you go to the Tridonic website its straight forward to choose a suitable driver

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