Boost driver for long LED strings
rsdio tipped us to an app note on a Boost driver for long LED strings.
The long strings of LEDs commonly found in TV and display backlighting, street lights, and parking garage lights require a current driver capable of producing high voltages. This reference design provides such a driver using the MAX16834, and demonstrates how very-high dimming ratios can be obtained.
Thanks rsdio!
This entry was posted in power supply and tagged boost driver, LED.
Comments
I’m so glad that you brought this up (besides also being a fan of Maxim appnotes)…
For a couple months I’ve been trying to get around to doing a constant-current HBLED driver board, but it’s so far down in my pile of things to do. I ‘ve felt like I’ve had to do my own because I’ve got a bunch of goofy LEDs that take weird currents like 240/400/500/800 that I can’t find affordable off-the-shelf drivers for.
So how about a really Dangerous HBLED driver board, namely one with programmable current levels (perhaps with something like an I2C/SPI digipot, or even DIP switches, in a pinch) for the 240-1000mA range? Ultimately the problem that I’d like to solve is for wireless, separately addressible single/short-string HBLED halogen tracklight replacements.
Just a thought…!