520nm diode driver

Hi, i was thinking of replacing the diode of my laser. I got a 405nm laser. I made it watertight, but at the same time, easy to swap diodes if it dies. But i want to get a 50mW PL520 osram diode.

Now, the driver board and BMS controll circuit is something hard to replace in this laser and something i don't want to replace as soldering that toghether and shaping it perfectly so everything fits takes days of hard work.

( Laser Driver Board for 5-250mW 405nm Blue-violet Laser Module | eBay )

My question is whether this driver is suitable for this Osram diode. It is a boost driver, and it could output 6.1 volts . I tested it. This driver is also no load protected and i could easily get 200mA out of it. It would be awesome if it is compatible so i could set the current for the 520nm diode, plug it in and seal it

Thanks

Edit, forgot to mention, i couldn't find any information about this anywhere

Anyone who can explain?

Hopefully someone will chime in that knows. I can offer moral support but that's about it. :tinfoil: Does sound like it would be much nicer if you could just swap the diode out. :thinking: Hoping the best

Yea that would be awesome. If it isn't possible i will leave it the way it is. Maybe upgrading to a higher power diode but sure i won't change that embedded driver

6.1V may not be enough to get to even specified power levels. Typical operating voltage at specified current (50mW, 125mA) is 6.9V, but can be up to 8V for the PL520-B1 (Varies depending on batch/temperature etc) according to the datasheet. If the maximum driver output is 6.1V you likely won't be able to reach full specified power.

diachi said:

6.1V may not be enough to get to even specified power levels. Typical operating voltage at specified current (50mW, 125mA) is 6.9V, but can be up to 8V for the PL520-B1 (Varies depending on batch/temperature etc) according to the datasheet. If the maximum driver output is 6.1V you likely won't be able to reach full specified power.

Click to expand...

hi, thanks for your reply. The 6.1v output was without load. It is a constant current driver. Do you think the voltage will rise when a 520nm diode load has been detected? It is not fixed voltage tough.

This driver can handle power without load so i decided to test voltage without load. Anyway thanks!

BlackOps said:

hi, thanks for your reply. The 6.1v output was without load. It is a constant current driver. Do you think the voltage will rise when a 520nm diode load has been detected? It is not fixed voltage tough.

This driver can handle power without load so i decided to test voltage without load. Anyway thanks!

Click to expand...

If it got to 6.1V without load then that's probably going to be the maximum output... It may even be unstable when running like that.

With no load it'll up the voltage trying to reach the set current, but it will be unable to as there is no load. It'll keep going until it reaches the maximum output voltage, which in this case sounds like 6.1V.

Build/buy a test load and try it out to be sure, but I don't think it'll work, at least not at full power.

diachi said:

If it got to 6.1V without load then that's probably going to be the maximum output... It may even be unstable when running like that.

With no load it'll up the voltage trying to reach the set current, but it will be unable to as there is no load. It'll keep going until it reaches the maximum output voltage, which in this case sounds like 6.1V.

Build/buy a test load and try it out to be sure, but I don't think it'll work, at least not at full power.

Click to expand...

Hi, thanks for your help. I tested it and it unfortunately didn't go higher then 6

this driver could push 250/300mA. Would it be possible for me to install a M140 diode and underpower it? I don't need 1W. Something like 100 or 250 mW would be awesome

BlackOps said:

Hi, thanks for your help. I tested it and it unfortunately didn't go higher then 6

this driver could push 250/300mA. Would it be possible for me to install a M140 diode and underpower it? I don't need 1W. Something like 100 or 250 mW would be awesome

Click to expand...

From the sounds of it if you keep the diode that's in it now you should probably get what is called a boost driver that can drive the diode at the full voltage it requires using the power you have available but somebody that knows more than I do (almost anyone here) should help set you on the right path......

BlackOps said:

Hi, thanks for your help. I tested it and it unfortunately didn't go higher then 6

this driver could push 250/300mA. Would it be possible for me to install a M140 diode and underpower it? I don't need 1W. Something like 100 or 250 mW would be awesome

Click to expand...

PLT5 450B is what you want with a Nano or Flexdrive. DTR has a module. SL has a cheap host to put it in. It doesn't need much heatsinking at all.

M140 Nano @1.1a 10440 cell.