BlackBuck 8M few questions

According to

BlackBuck 8M - 8A Buck Laser Driver - NDB7A75, NUBM44, NUMB05, NUBM06, NUBM08 | eBay

On picture with tag "The connection method if you are not using external modulation sources"

on laser diode or LED must be 2...5 V forward voltage

but I received around 10,5V

https://drive.google.com/drive/folde...mM?usp=sharing

IMAG0592.jpg


also I try connect like tag "The connection method using an external signal"

I have an arduino as PWM/TTL
Frequency around 1,95 kHz
Duty cycle from 35% on 1% power in arduino to around 95% on 99% power in arduino

but on LED i still receiving around 10,5V

I also try like this

https://www.hackster.io/macinblack/l...arduino-719d14

with potentiometer but also unsuccessfully

Arduino with this cheaper chinese driver work perfect

12V TTL 1W 1.6W 3W 445nm 450nm Laser Diode LD Driver Power Supply Stage Light | eBay


What I do wrong?