7.0 Parameter guide line for CFL inverter
CCFL current (ICFL)
CCFL Frequency (FCFL)
CCFL Ignition Voltage (Vs)
CCFL Voltage (Reference)
CCFL Power consumption
Lamp Life Time
At 6mA ICFL
Hr Note1, 5
Note2：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.
(1) 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%).
(2) There should not be any spikes in the waveform.
(3) The waveform should be sine wave as possible.
(4) 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 is over the maximum value for a long time, it may cause fire.
Therefore, it is recommend that the inverter should have the current limit circuit.
Note3：The inverter open voltage should be designed larger than the lamp starting voltage at
T=0oC, 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
Note4：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
Note5：Brightness (ICFL=6mA) to be decreased to the 50% of the initial value.
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2004 All Right Reserved.
No Reproduction and Redistribution Allowed.
G084SN05 V.1 ver.0.2