August , 2012, REV2.
1
BCT3256
6 Channel Constant Current LED Driver
Low Dropout Current Sink
General Description
The BCT3256 is a high performance constant current white LED driver.
The BCT3256 uses an internal resistor to set the bias current for 6 LEDs, which are matched to 3%.
The BCT3256's advantages over ballast resistors include much lower bias variation with supply
voltage variation, significantly lower dropout
voltage, and in some applications, significantly improved efficiency.
The BCT3256 requires only a 50mV dropout
voltage at a 20mA load on each output to match the LED brightness.
Users can easily configure the LED current from 1.
25mA to 20mA by a serial pulse interface.
The dim...