led P9834 with P9823 chipset inside, voltage step down program

Hello everybody!

I have buy this led : http://www.aliexpress.com/item/P9834-F5-5mm-straw-hat-RGB-LED-with-P9823-chipset-inside-full-color-frosted-voltage-step/1709721555.html.

At begining I thought p9834 is same that p9823 (and p9823 it's same that ws2812). I have already play with ws2812 (or p9823) and it's work good with the neo-pixel sample. But the neo-pixel sample don't work with this led (p9834) :o .

anybody have already try this led ?