In looking to complete a high powered LED project, I came across the Luxeon BuckPuck as a current regulator used for driving the Luxeon LEDs. My hope is to be able to change the brightness of the LED, and it sounds like the BuckPuck allows you to do just that, but I can't quite seem to make out how their sample circuit allows you to adjust it using an IC. Their sample circuit on page 7 of their data sheet (http://www.luxeonstar.com/3021-buckpuck.pdf) apparently has a piezo transducer??
Can anyone explain how efficient dimming can be controlled via an IC? There is no need for infinite adjustability, just 2 or 3 settings.
Also, would using a LM327 as a positive voltage regulator allow me to efficiently step up from 5 volt to 12 volt for use with the BuckPuck? The spec sheet says that with an external transistor it can handle up to 1A, but I don't know if there are other implications or not
Thanks
Can anyone explain how efficient dimming can be controlled via an IC? There is no need for infinite adjustability, just 2 or 3 settings.
Also, would using a LM327 as a positive voltage regulator allow me to efficiently step up from 5 volt to 12 volt for use with the BuckPuck? The spec sheet says that with an external transistor it can handle up to 1A, but I don't know if there are other implications or not
Thanks