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16-channel white LED driver
26 May 2010, Opto-Electronics
AnalogicTech’s AAT2400/2401 is a highly integrated, high efficiency white LED lighting solution which consists of a master device (AAT2400) and a slave device (AAT2401). The devices operate from a regulated 12 V or 24 V d.c. power supply.
The master device supplies a 40 V rail to drive 10 series LEDs with a typical forward voltage of 3,6 V with up to 100 mA. 16 precision current sinks split evenly between the master and slave devices provide a constant current drive for up to 160 white LEDs. Feedback from each of the current sinks is fed back to the boost converter to ensure the optimum voltage is applied to the LED strings. A high-speed, SPI-compatible interface allows fast, independent digital control of each current sink programmed to a maximum value using an external resistor.
An 8-bit dot correction register compensates for variations in LED brightness, while two 12-bit registers control the greyscale current and delay time. Channel ON/OFF control is also included. Each master and slave contains a 2-bit register which allows up to 256 LED strings to be controlled in a single system. The greyscale PWM clock is internally generated or can be externally supplied. Fault handling and detailed reporting is handled by the SPI bus while a fault is indicated via a fault pin. The system monitors open- or short-circuit LEDs, and includes over-voltage, over-current and over-temperature protection.
The AAT2400 and AAT2401 are available in lead-free, thermally enhanced 36-pin 5 x 5 mm TQFN packages. For more information contact Marinus Rudman, Hi-Q Electronics, +27 (0)21 595 1307, marinus@hi-q.co.za, www.hi-q.co.za |
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