DD312 SITI [Silicon Touch Technology Inc.], DD312 Datasheet - Page 8

• Manufacturer Part Number: DD312
• Description: HIGH CONSTANT CURRENT LED DRIVER with ERROR DETECTION
• Manufacturer: SITI [Silicon Touch Technology Inc.]

Alarm Function (SOP8 Only)
pin. The ALARM pin is kept ‘H’ for normal conditions, and shifted to ‘L’ if there is any failure like
LED open, overheating or both occurrence. User can determine the different status from the truth
table below:
Thermal Alarm and Shutdown
pin will shift to low level and produce a warning signal. Suggested cooling measures is to start the
fan, lower the output currents and etc. If no cooling measures were activated, the junction
temperature might continue to rise. Once it reaches approximately above 180℃, it will cause the
driver to shutdown all the outputs. Basically, the IC will cool down and return to the safe operating
temperature which is approximately below 110℃. The ALARM pin will reset to high level, disable
the warning, and restart all the outputs at the same time. Operation in the thermal situation for a long
time may cause chip damage permanently.
HIGH CONSTANT CURRENT LED DRIVER
It can detect the operating status by connecting a pull-high resistor to the open-drain ALARM
During operation, when the junction temperature of the IC will reach about 110℃, the ALARM
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
Tel：[phone]
9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C.
ALARM
H L
H L
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H
Fax：[phone]
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EN
H
L
LED Open or Thermal issue
Thermal Alarm or Shutdown
Normal Operation
Version:A.001
Status
Page 7
DD312