LQ150X1LGN2A Datasheet, PDF (12/24 Pages) Sharp Electrionic Components – TFT-LCD MODULE

LD-16Z09-10
6-2. Backlight
The back light system is an edge-lighting type with 2 CCFTs (Cold Cathode Fluorescent Tube).
The characteristics of the lamp are shown in the following table.
The value mentioned below is at the case of one CCFT.
CCFT Model Name : KTBE24MSTF-530.5KB270-Z-L (STANLEY ELECTRIC CO.,LTD)
Parameter
Symbol Min. Typ. Max. Unit
Remark
Lamp current range
IL
3.0
4.0
5.0 mArms ʲNote1ʳ
Lamp voltage
V_L
ʵ
1050 1200 Vrms IL=4.0 mArms Ta=25ˆ 60kHz
Lamp power consumption PL
ʵ
4.2
4.8
W ʲNote2ʳ
IL=4.0 mArms Ta=25ˆ 60kHz
Lamp frequency
FL
40
60
70
kHz ʲNote3ʳ
Kick-off voltage
Vs
ʵ
ʵ 2200 Vrms Ta=0ˆ 60kHzʲNote4ʳ



Lamp life time
TL 50,000 ʵ
ʵ
hour ʲNote5ʳ
ʲNote1ʳ A lamp can be light in the range of lamp current shown above.
Maximum rating for current is measured by high frequency current measurement equipment
connected to V_LOW at circuit showed below.
(Note : To keep enough kick-off voltage and necessary steady voltage for CCFT.)
Lamp frequency : 40ʙ70kHz
Ambient temperature : 0ʙ50ˆ
.PEVMF





*OWFSUFS

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ʙ
ʲNote2ʳ Referential data per one CCFT by calculation ( IL ʷ VL ) .
The data don’t include loss at inverter.
ʲNote3ʳLamp frequency of inverter may produce interference with horizontal synchronous frequency, and this
may cause horizontal beat on the display. Therefore, adjust lamp frequency, and keep inverter as far as
from module or use electronic shielding between inverter and module to avoid interference.
ʲNote4ʳThis is transformer output voltage at 33pF for the ballast capacitor of a DC-AC inverter.








The kick-off voltage may rise up in the user set, please decide the open output voltage by checking not
to occur lighting failure under operating state.
The open output voltage should be applied to the lamp for more than 1 second to startup. Otherwise the
lamp may not be turned on.
ballast capacitor(33pF)

1
Module
2
Inverter
V
ʙ
ˎ 2pin VLOW