Advantech IDK-1110WR Series, User Manual, Page: 17 / 37

11 IDK-1110W User Manual
Chapter 2
E
lectrical
Characteristics
2.2 Backlight Unit
2.2.1 Parameter guideline for LED backlight
Following characteristics are measured under a stable condition using an inverter at
25°C (Room Temperature):
Note1 The constant current source is needed for white LED back-light driving.
When LCM is operated over 60 deg.C ambient temperature, the IL of the
LED back-light should be adjusted to 460mA max.
There are 6 Groups LED shown as below, VLEDA-LEDK=9.6V ,Ta=25
°C
Note1 Condition: Ta=25
°C,
continuous lighting
Life time is estimated data. Definitions of failure:
1. LCM brightness becomes half of the minimum value.
2. LED doesn’t light normally.
When LCM is operated over 40
°C
ambient temperature, the ILED should be followed:
Parameter Symbol
Value
Unit Note
Min. Typ. Max.
LED Driver voltage VLED 4.5 5 5.5 V
Power Supply Current
For LED Driver ILED - 1.4 - A VLED=5V
VADJ=3.3V
(duty 100%)
ADJ Input Voltage V
ADJ
- 3.3 VLED V duty=100%
LED_EN Voltage V
EN
- 3.3 - V
LED voltage V
AKL
- 9.6 10.8 V I
L
= 540mA,
Ta = 25°C
LED current I
L
- 540 - mA Note1
- 460 - mA Note1
LED Life Time - - 50K - Hour Note2