Advantech IDK-1112P-50XGA1, User Manual

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9 IDK-1112P User Manual
Chapter 2
LCD Display
2.4 Backlight Unit
The following characteristics are measured under stable condition at 25°C
Table 2.2: Backlight Driving Conditions
Parameter Symbol
Values
Unit Note
Min. Typ. Max.
Converter Power Supply Voltage Vi 10.8 12 13.2 V
Converter Power Supply Ripple Voltage ViRP - - 500 mV
Converter Power Supply Current Ii - 0.7 0.85 A
@ Vi = 12V
(Duty 100%)
Converter Inrush Current IiRUSH - - 3.0 A
@ Vi rising
time =10ms
(Vi =12V)
Backlight Power Consumption PBL - 8.4 10.2 W
@ Vi = 12V
(Duty 100%)
EN Control Level
Backlight On
BLON
2.5 3.3 5 V
Backlight Off 0 - 0.3 V
PWM Control Level
PWM High Level
E_PWM
2.5 3.3 5 V
PWM Low Level 0 - 0.15 V
PWM Noise Range VNoise - - 0.1 V
PWM Control Duty
Ratio
-
2 - 100 % @200Hz
PWM Control Fre-
quency
fPWM 190 200 20k Hz (3)
LED Life Time LL 30,000 - - Hrs (2)
Note (1) LED current is measured by utilizing a high frequency current meter as
shown below:
Note (2) The lifetime of LED is estimated data and defined as the time when it
continues to operate under the conditions at Ta = 25±2 °C and Duty
100% until the brightness becomes
≤ 50% of its original value. Operating
LED at high temperature conditions reduces lifetime and leads to color
shifts.
Note (3) At 200Hz PWM control frequency, duty ratio range is restricted from 2%
to 100%, When PWM control frequency is 20kHz, duty ratio range is
restricted from 10% to 100%.