LM3447-PAR-230VEVM: does not work truly

Hello,

Your current waveform does not look correct.

What are you using for the load? How many LEDs and what Vf?

How are you measuring current? How is the board being powered? The board common is not earth ground if connected to line due to the bridge rectifier so care must be used when looking at waveforms.

Are the LEDs lighting up? Do you know what the input power is measuring?

Regards,

Hi,
Load is 2 (parallel)*10 (serial)=20 led, v=3,2V >> Vout=3,2*10=32 V
You can see leds: www.marketdijital.com/1-Watt-Edison-Opto-Powerled-50-Adet-Beyaz-6500-C-120-Lumen,PR-3106.html
I measured current with osciloscope having current and voltage probes.

Yes leds are lighting up.

Hello,

Have you measured the output voltage? It should be fine if it's approximately 32 volts.

Are you running this from building power or some other source?

Are you running it without any modifications?

It should just work so either something is connected incorrect, something was damaged or it just didn't work when it arrived. Have you looked at the current without anything else connected to the board?

Thanks,

Yes it is 32 V,
Input voltage is 220 V.
There is no modification.
Yes, when the anything is connected, the current is zero.

Hello,

When you say "Yes, when the anything is connected, the current is zero", does this mean the oscilloscope or other test equipment?  A power supply, such as this LED driver, has a rectifier bridge to rectify the incoming AC voltage.  Test equipment can be referenced to earth ground so if you connect an oscilloscope probe ground to the common of the board it will create a short through the rectifier bridge and possibly damage the board or equipment (if this is what you mentioned).

Does the board work without any test equipment connected?  Is your current  probe an isolated (hall effect) type of measurement?  If so you can monitor the current of the circuit without causing any ground current paths to flow.

Thanks,