DM621 TSSOP24 12-CHANNELS PRE-PROGRAMMABLE CONSTANT CURRENT LED DRIVER

Product Descriptions

The DM621 is an innovative LED driver that integrates a new data transmit interface to accomplish 2-wires  control  for  lighting  applications.    By  the combination  of  SIN  and  DCK,  DM621  could  be  pre-programmed  to  set  the  operating  modes  that  involve  GCK  frequency  division,  PWM  grayscale selection,  inverse  IOUT  PWM  signal,  and  GCK  frequency  selection.    DM621  also  provides  the  auto-latch  function  and  incorporates  a  particular PWM  method  (AS-PWM).    The  IOUT  waveform  is  averagely  divided  into  16  sections in order to reduce the flickers and enhance the visual refresh rate.

The DM621 could  also  be  constructed  as  a  PWM  controller  for  LED  drivers.      In  this  case,  resistors  must be connected at output pins to achieve this function (Fig.18).

This chip incorporates 4x3-channel constant current circuitry with current value set by 3  external  resistors  and  256/1024/4096/16384  gray  scale  PWM  function  unit.    Each  channel provides a maximum current of 90mA.    The maximum output sustaining voltage of 28V would make more serial LEDs possible.    And DM621 also integrates an internal regulator  to  make  power  supply  voltage  up  to  12V.      Meanwhile,  retiming  of  DCKO  and  SOUT is advantageous in the LED decorating and long-cascade applications.

Product Features

z 4 x 3(R/G/B) Output Channels

z 8/10/12/14-bits PWM grayscale Control

z Maximum Clock Frequency: 20MHz

z Constant Current Output: 5mA to 90mA

z Maximum Output Sustaining voltage: 28V

z Power Supply Voltage: 5V to 12V

z Average Separated IOUT PWM Waveform

z Auto-latch Function

z Retiming of DCKO and SOUT for long cascade applications

z Serial Shift-In Architecture for Data of Grayscale, frequency Division and PWM bit number

z Incorporating      internal      GCK oscillator  12MHz    (Refresh rate = 46.8KHz @ 8-bits PWM)

z Package:  TSSOP24 (with thermal pad), QFN20 (with thermal pad)

Specifications

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