China Driver - strange current measure

Hi,

i have bought this driver (3A TTL Laser Driver Board Step Down Driver Module 405nm 445nm 450nm | eBay)

I tried to adjust the values, but with a testload (4*1N4001 + 1Ohm 5W ~> M140 LD) i got this.

look the attachements

the measured current has a peak over the adjusted value.

at lpf3.jpg u can see the differenz between measurement methods. Above is simple the voltage over the diode, below measurement is the ld current.

who knows about this driver ?

greetings

Attached Thumbnails