led driver ic ?

[mark krawczuk]

hi, can anybody recommend a led driver ic , that can power at least 10
WHITE LEDs, 100mA 265,000mcd ?? from a 6 volt dc supply ? with good
efficiency ?
than ks,
mark k

 

[TT_Man]

"mark krawczuk" <krawczuk@adam.com.au> wrote in message
news:f5ydndEALaF8_hbanZ2dnUVZ_u-unZ2d@adnap.net.au...

hi, can anybody recommend a led driver ic , that can power at least 10
WHITE LEDs, 100mA 265,000mcd ?? from a 6 volt dc supply ? with good
efficiency ?
than ks,
mark k

look at maxim-ic.com

 

[Lostgallifreyan]

"mark krawczuk" <krawczuk@adam.com.au> wrote in
news:f5ydndEALaF8_hbanZ2dnUVZ_u-unZ2d@adnap.net.au:

hi, can anybody recommend a led driver ic , that can power at least 10
WHITE LEDs, 100mA 265,000mcd ?? from a 6 volt dc supply ? with good
efficiency ?

If they're all on at same brightness, try a DC-DC boost converter and a
single series resistor. If the total Vf is very slightly less than the DC
output of the converter the efficiency will be very good. Whatever you do
should include this, as the losses of 1A through a limit resistor with LED's
at maybe 4V Vf on a 6V supply will not be efficient. If you want efficiency
without voltage boost you'll need to sense the current and use feedback to
control a PWM or similar supply, and things get expensive that way. Can't
make specific advice because I don't know anything about your LED network.
Series? Parallel? Individually switched? Brightness control?

 

[Sjouke Burry]

mark krawczuk wrote:

hi, can anybody recommend a led driver ic , that can power at least 10
WHITE LEDs, 100mA 265,000mcd ?? from a 6 volt dc supply ? with good
efficiency ?
than ks,
mark k


Look at
http://www.automotivedesignline.com/products/192700098

and similar ones.

 

[ian field]

"TT_Man" <Someone@ntlworld.com> wrote in message
news:aJKij.47121$745.26476@newsfe1-win.ntli.net...

"mark krawczuk" <krawczuk@adam.com.au> wrote in message
news:f5ydndEALaF8_hbanZ2dnUVZ_u-unZ2d@adnap.net.au...
hi, can anybody recommend a led driver ic , that can power at least 10
WHITE LEDs, 100mA 265,000mcd ?? from a 6 volt dc supply ? with good
efficiency ?
than ks,
mark k

look at maxim-ic.com

Linear Technology (LT) also do a few IIRC.