Hi,
We have tried to use in our project LM3414HV.
We used:
Radj: 3.9 kOHM (About 800mA output limit)
L: 47 UH / 1.5A
RFS: 40 kOHM - 500kHZ
D: 100V 3A
Cvcc: 1uF 16V
According to this design, We should get 800mA constant current output.
Input voltage: 52V
Test 1: 22 x Red LED 2.1V = 46V / Result: Output voltage 44V 500mA
If I increase the input voltage step by step, the output current is increasing as well. But never stop at 800mA. For example, I tried with 62V input voltage. Output current is about 900-950mA
Test 2: 10 x Far Red LED 2.2V = 22V / Result: Output voltage 22V 800mA
If I increase input voltage from 52 to 62V, again never stop at 800mA output current and I have seen about 1000-1050mA. And I tried to reduce output voltage about 30-40V, output current reduce under 800mA about 700-750mA
What is the problem? Why I can not limit output current? Why output current not stay stable?
I need your support asap. Best regards.
