DM412 

3-CHANNEL CONSTANT CURRENT LED DRIVERS 

WITH LED OPEN DETECTION

General Description

DM412 is a PWM enabled LED driver specifically designed for LED video display or lighting applications. Each channel has linear adjustable 16-bits (65536 steps) grayscale PWM control current outputs. It incorporates shift registers, data latches, 3-channel constant current circuitry with current value set by 3 external resistors, and built-in oscillator for PWM functioning. Data, clock, and latch buffer outputs are designed for cascading another chip. Its built-in open detection function help users locate LED failures without additional circuits. The output polarity reverse function is designed for more high power LED applications.

Features

l Maximum constant current outputs: 200mA determined by three external resistors

l Maximum sinking output voltage: 17V

l Maximum serial-in clock frequency: 20 MHz

l bit linear PWM control current outputs

l Built-in buffers for cascading clock, data, and strobe to next driver

l PWM free-running capability (refresh rate (~ 267 Hz) with internal oscillator (~ 17.5 MHz))

l Selectable auto/manual strobe (Patent pending)

l LED open detection

l Output polarity reverse function

l Power supply voltage: 4V ~ 5.5V