cashio 445 + aixiz 300mw-1w driver

Hello.

I have a problem with my aixiz driver: When i connect the driver to the battery, it powers the diode fine for like a second or so. After this the power drops significantly and goes very faint, i think it stops lasing? Soon after this it stops completely. If i wait a few seconds it works again, so it clearly is heat limited.

I can hear a buzzing sound from the driver when it is running.

Is there any tricks i should know or is this driver busted or simply not working with this diode?

Here is the driver in question: 1W 445nm blue laser diode driver / 405nm laser driver | eBay

Or could it be that its my diode cooling that is at fault here? First time i tested it i had no heatsinking and only very quickly tested it, and it burned my fingers immediately. So i took an aluminium plate, drilled a hole and pressed the diode in there. Should i apply silicon paste to spread heat from the diode to the aluminium plate?

You definately need a heat sink or you will kill your diode. what are you using for batteries?

The aluminium plate acts as a heat sink. It does not even get war to touch. So either the heat does not conduct well enough or the problem is somewhere else.

The battery is a 3.7V li-ion. I have another one of these diodes with a microdriver running of the same battery, so that is not the problem. That one came pre-mounted in aixiz housing, so it does not help me determine if the problem is in the aixiz driver or in my mounting (or in the diode for that matter).

I think you should, put some thermal glue between the
aluminum case and the module.
It sound like a driver problem to me.

Jim

Its definitely a driver problem, driver needs to be replaced! the buzzing sound is from the connections on the pcb layout frying due to high resistance, i think its because of the wires too thin on the pcb.
I had the same problem with a microsized driver since then im using a full sized to-220 package and hand soldering them , they are not as small as the pcb's but they are small enough to fit into any build at the fraction of the cost..and best of all, they never died on me!!