recommend a good led driver chip

[M. András]

hi im looking at some high power leds to replace the current lighting in my house http://uk.farnell.com/cree/cxa2011-0000-000p00h040f/led-array-cxa2011-ezwht-4000k/dp/1886686 or http://uk.farnell.com/bridgelux/bxra-n6300-00l0e/led-array-6300lm-neut-white-4000k/dp/1876129 and i need a recommendation for suitable led driver chips, maybe 1 of these which would be good for the cree led array http://uk.farnell.com/xp-power/ldu4860s1000/led-driver-dc-dc-48w/dp/1961538?in_merch=New%20Products but i cannot find such a solution to the bridgelux dimm capability would be good

[IanB]

Wouldn't something mains powered like this be more convenient?

http://uk.farnell.com/lightech/9010481050p/led-48wdc1050ma-al-housing-converter/dp/1888133

[M. András]

Wouldn't something mains powered like this be more convenient?

http://uk.farnell.com/lightech/9010481050p/led-48wdc1050ma-al-housing-converter/dp/1888133

its can be an option too, but for a quick search dimming only available with trailing edge dimmers on the mains side which looks expensive for a quick google search, also it would be expensive to buy 5 unit of this, compared to my first idea get a good quality toroid transformer and use it as a central supply to all of the led arrays in the house, only inside

[M. András]

i was playing a bit with the national's webench tool, and i want some info from this circuit if there is any practicular things to watch out when i lay it out and make the prototype for the first time from this, i hope i calculated right the dynamic resistance of the led according to the example from the national site, however i noticed its gave line frequency 60Hz but im not in the US so here the mains frequency is 50Hz but of course it will be rectified and filtered before it reaches the pcb. files are in the included zip. thanks for all of you who give me a reply