4 Channels Constant Current LED Driver With Cascade DMX512 Protocol and Differential Interface
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The MY9941, 4 channels constant current LED driver with 14bits grayscale APDM (Adaptive Pulse Density Modulation) control, supports standard/4x DMX512 protocol and fully differential interface suited for long distance cascade applications. The distinctive DMX512 decoding approach could decode precisely a standard DMX512 signal. And each device loads one/two/three/four grayscale data according to two slot selection pins. The differential interface provides wide common-mode range to support long distance transmission without common-ground power systems.
The device operates over 7V to 40V input voltage range and provides 4 open-drain constant current sinking outputs that are rated to 40V and delivers up to 350mA of high accuracy current to each string of LED. The current at each output is programmable by means of four external current setting resistors. The MY9941 provides the gamma correction, gamma value is 2.2, to transform 8bits DMX data to 14bits APDM data in order to enhance brightness contract. The 14bits adaptive pulse density modulation makes sure that the frame refresh rate is higher than 2KHz. And an accurate oscillator is built in for free running APDM grayscale control and DMX512 deconder.
Furthermore, MY9941 also supports 4X DMX512 interface to enhance data refresh rate by four times. MY9941 could drive High Power LED directly by shorting the output channels and changing the slot data number. The POL function makes MY9941 as a PWM generator to support driving high power LEDs. MY9941 is available in SSOP24/TSSOP20 packages and specified over the -40°C to +85°C ambient temperature range.