I want to drive 3 high power LEDs in series (voltage Drop 6.3-8.4V) at up to 700 mA using a Buckpuck driver (700 mA). What I want to do is to regulate the LEDs using PWM with my Arduino to be able to fade up the LEDs, hold for a desired amount of time and fade out and hold for a desired amount of time (the on/of durations may be asymmetric). I am thinking to power the LEDs through the buckpuck river using a 9v 1 A external power source. I will then connect the control pin of the buckpuck driver to the 5v Arduino circuit to use PWM to control fading of the LEDs. Do you think that will work? Could you also suggest any alternative ways of doing this? Also any precautions I need to take to avoid frying the circuit?
Hello Arpan. Yes it will work. This is how all drivers work. Since there is a 5V input on the driver there is no need to worry about the Arduino. Also, don't forget to set a common GND (connect the Arduino GND to Buckpuck driver GND).
It will work. The LEDs power is not important as long as the driver supports it. If you want you can also isolate the high-power side from your Arduino using a fast optocoupler or some opto-isolated MOSFET driver like HCPL-J312.
there should be no problem.
only take care that u use an PWM - Pin (not every digital output Pin supports PWM) on most Boards marked with "~"
Thanks for all your inputs. I have ordered the components of the circuit and will try it out soon.
Hi Arpan, it seems you are involed in some interesting research.
To control BuckPuck with an arduino please use connections from fig 14 or 15 from datasheet (I would suggest 14 - for minimum component use).
The software for the task you have described seems really simple - please PM me if you would like to get it for kickstarting your project.
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