點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
新竹市科學園區展業一路9號7樓之1
9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C.
DM634
Tel：886-3-5645656
Fax：886-3-5645626
DM634
16-CHANNEL CONSTANT CURRENT LED DRIVER
WITH PROGRAMMABLE PWM OUTPUTS
General Description
DM634 is a 16-channel constant current sink LED driver. Each channel has adjustable 16-bits
(65536 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
z Constant-current outputs: 5mA to 90mA
z 16-bit linear PWM control current output per channel
z 7-bit high accuracy global brightness control
z Maximum output voltage: 17V
z Maximum clock frequency: 25MHz
z Selectable internal/external PWM reference clock
z PWM free-running capability (refresh rate ~ 275 Hz with internal oscillator ~ 18 MHz)
z Build-in real-time LED open/short detection
z Thermal Alarm and Shotdown –
Alarm : Junction Temperature >110℃
Shutdown : Junction Temperature > 180℃
z Package and pin assignment (except QFN32) compatible to conventional LED driver series
(ST2221C, DM134B/5B, DM13C)
z Power supply voltage: 3.3V to 5.5 V
Applications
z Indoor/Outdoor LED Video Display
z LED Variable Message Signs (VMS) System
z LED Decorative Lighting
Package Types
z SOP24, SSOP24, TSSOP24E (with exposed pad)
16-channel 16-bit PWM Constant Current LED Driver
Version : A.003
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