Test Driver 560mini 5V/5A 1$

[Borislav@87]

I had bought these drivers a long time ago for a test. This one is step down 5V and 5A. In a test with two 18650 batteries to a damaged NUBM0F laser diode, the driver put out 4.3A and held them steady. I didn't feel it heating up.

High Efficiency Output 3.3V 5V 9V 12V 5A mini560 Step Down DC-DC Converter Voltage Regulator Buck Stabilized Power Supply Module

https://a.aliexpress.com/_mLJTCBQ

 

[paul1598419]

These are voltage regulators, not current, and won't work in place of a good current regulator. I bought some many years ago hoping to modify them, but it wasn't readably doable.

 

[Borislav@87]

These are voltage regulators, not current, and won't work in place of a good current regulator. I bought some many years ago hoping to modify them, but it wasn't readably doable.

Yes it is. Just sharing the result with two 18650 batteries. With lab power even at 6V it holds 4.2A

 

[paul1598419]

Unfortunately that current won't remain constant as your load changes.

 

[Borislav@87]

Yes, probably. But it will not exceed 5A under any circumstances. For blue diodes like NUBM0E, nubm0f, nubm44, it will work. With two batteries they will work at about 4A

 

[paul1598419]

As your load increases with the decease of effective resistance of your laser diode you run the risk of thermal runaway and destruction of your diode. You'd be better off just using a resistor to limit the current to 4.2 amps at some value just above 0 resistance. That way it can't go over 4.2 amps regardless of your load.

 

[Borislav@87]

@paul1598419
It is, but the NUBM0F can withstand up to 6A without problems. Especially for him, I see no problem working with this driver. In this case, 4.2A is nothing for this laser diode. I doubt it will damage the diode because 4A is quite far from the maximum it can handle. My 7-8W lasers have been running at 5.2A for a long time and still work.

 

[paul1598419]

@paul1598419
It is, but the NUBM0F can withstand up to 6A without problems. Especially for him, I see no problem working with this driver. In this case, 4.2A is nothing for this laser diode. I doubt it will damage the diode because 4A is quite far from the maximum it can handle. My 7-8W lasers have been running at 5.2A for a long time and still work.

It would depend on the voltage it ran at. I would expect a failure of either the diode or the voltage regulated driver if you use it in place of a current regulated source. A much better solution would be a current limiting resistor.