LITEMAX ALF2011, Руководство пользователя

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Page 11
Backlight unit
The backlight system is an edge-lighting type with a CCFT(Cold Cathode Fluorescent
Tube). The characteristics of a single lamp are shown in the following tables.
Parameter Symbol Min. Typ. Max. Unit Remark
Lamp voltage V
L
720 800 880 Vrms Note 1
Lamp current I
L
4 6.5 7 mArms Note 1
Power consumption P
L
- 5.2x6 - W Note 2
- - 1500(T=0 ℃
)
Lamp starting voltage V
S
1150(T=25
℃
)
Vrms Note 3
Frequency F
L
40 52 60 KH
Z
Note 4
Lamp life time L
L
50000 - - Hr Note 1, 5
Note (1) T= 25
℃
Note (2) Inverter should be designed with the characteristic of lamp. When you are
designing the inverter, the output voltage of the inverter should comply with
the following conditions.
(a) The area under the positive and negative cycles of the waveform of the lamp
current and lamp voltage should be area symmetric (the symmetric ratio should
be larger than 90%).
(b) There should not be any spikes in the waveform.
(c) The waveform should be sine wave as possible.
(d) Lamp current should not exceed the maximum value within the operating
temperature (It is prohibited to over the maximum lamp current even if operated
in the non-guaranteed temperature). When lamp current over the maximum
value for a long time, it may cause fire. Therefore, it is recommend that the
inverter should have the current limited circuit.
Note (3) The inverter open voltage should be designed larger than the lamp starting
voltage at T=0
o
C, otherwise backlight may be blinking for a moment after turning
on or not be able to turn on. The open voltage should be measured after ballast
capacitor. If an inverter has shutdown function it should keep its open voltage for
longer than 1 second even if lamp connector is open.
Note (4) Lamp frequency may produce interference with horizontal synchronous
frequency and this may cause line flow on the display. Therefore lamp frequency
shall be detached from the horizontal synchronous frequency and its harmonics
as far as possible in order to avoid interference.
Note (5) Brightness (I
L
= 6.5mA) to be decrease to the 50% of the initial value.
Note (6) CN2 connector (backlight): BHSR-02VS-1 (JST)
Mating connector: SM02B-BHS-1-TB (JST)
Pin no. Symbol Function
Remark
1 H CCFL power supply
(H.V.) Cable color: Pink (central);
Dark Gray others)
2 L
CCFL power supply
(GND)
Cable color: White