high power led driver circuit diagram for 12v dc input and 630ma output

[homik52]

hello,


i want to make high power led driver that has input voltage 12v dc and the output is 40v dc......

 

[DeepOne]

may be this can be useful. but I did not check this sheme in work. probably else need to add external power transistor.

 

[homik52]

may be this can be useful. but I did not check this sheme in work. probably else need to add external power transistor.

i want drive 8 high power led each 1w consuming.
if i want to read about the led driver, from where i can read?

 

[DeepOne]

These schemes from http://www.radiokot.ru/forum/viewtopic.php?f=11&t=46546&sid=945cd5e37e522da679aa2d790b25b72e
, but there in russian language. However possible use on-line google translator.
Suppose, first it is necessary to get acquainted with datasheet
http://www.onsemi.com/pub_link/Collateral/MC34063A-D.PDF
MC34063.pdf:

i want drive 8 high power led each 1w consuming.

probably possible separate them on two groups, because MC34063 is inexpensive chip.