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Old 18th December 2003, 10:16 PM   #21
azira is offline azira  United States
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Quote:
What's the use of a LED driver ( ? ) if a resistor is enough ?
maybe unrelated but in the digital world, many chips won't be able to source or sink the current needed to drive an LED or drive it for long periods of time. I've often had to use drivers (or buffers) to light LEDs from the outputs of other devices like an FPGA or microcontroller.
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Old 18th December 2003, 10:22 PM   #22
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Originally posted by azira
maybe unrelated but in the digital world, many chips won't be able to source or sink the current needed to drive an LED or drive it for long periods of time.

aren't there leds that shine different colors when driven by different voltage / current / frequency?

so you can use a driver to control the color.
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Old 19th December 2003, 06:26 PM   #23
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Default Low current LEDs

Some chips can't drive standard LED's, some do. Always check datasheets for that. I use Fairchild HLMP-1700 ( red ) and HLMP-1790 ( green ) from Farnell with no problems whatsoever. Iforward is 1 to 7 mA on those.

Never heard of a chip that can't drive them

http://www.fairchildsemi.com/pf/HL/HLMP-1700.html
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