16-CHANNEL CONSTANT CURRENT LED DRIVER

 WITH PROGRAMMABLE PWM OUTPUTS

General Description

      DM633 is a 16-channel constant current sink LED driver. Each channel has adjustable 12-bits (4096 steps) grayscale PWM control current outputs. 7-bit global brightness control is included in supporting user to adjust chip current easily. It incorporates shift registers, data latches, constant current circuitry with current value set by an external resistor, selectable oscillator source for PWM functioning, and built-in LED open/short detection circuit to detect error status. It supports thermal alarm and shutdown function, system retrieve the message to indicate when junction temperature over limitation of chip. It is specifically designed for LED display and lighting applications.

Features

• Constant-current outputs: 5mA to 90mA 

• 12-bit PWM control current output per channel 

• 7-bit high accuracy global brightness control

• Maximum output voltage: 17V

• Maximum clock frequency: 25MHz 

• Selectable internal/external PWM reference clock 

• PWM free-running capability (refresh rate ~ 4.4k Hz with internal oscillator ~ 18 MHz) 

• Build-in real-time LED open/short detection

• Thermal Alarm and Shotdown –

                    Alarm : Junction Temperature >110℃

                    Shutdown : Junction Temperature > 180℃

•  Package and pin assignment (except QFN32 ) compatible to conventional LED driver

       series (ST2221C, DM134/5/6, DM13C)

• Power supply voltage: 3.3V to 5.5 V