Three individual switching regulators for each color provide constant-current output to drive high-power RGB LEDs. These integrate a high-side N-channel DMOS switch for DC-to-DC step-down (buck) conversion. A true average current IAVG is output using a cycle-by-cycle, controlled on-time method.
Output current for each color is user-selectable by a current sense resistor: RS = 0.2V / IAVG. Output voltage is automatically adjusted to drive various numbers of LEDs in a single string. This ensures the optimal system flexibility and efficiency.
Various communication protocols are implemented with the Atmel AVR onboard Micro Controller. This allows wired LED control using the DMX standard or any other RS-485 / RS-232 based communication.
Connecting a RF-ISM module allows wireless LED control. XBee adaptors or IQRF transceiver modules can be directly connected to the driver board.
LED dimming is accomplished by a pulse width modulation signal allowing 255 steps of brightness for each color - thus a theoretical range of 16 million colors.
The High Power LED Driver is developed and produced by our partner Engineering von Gunten.
(Product specification is preliminary information)