NL6448BC33-54 Просмотр технического описания (PDF) - NEC => Renesas Technology
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NL6448BC33-54 Datasheet PDF : 28 Pages
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NL6448BC33-54
4.3.2 Working for backlight lamp
(Ta=25°C, Note1)
Parameter
Symbol min.
typ.
max. Unit
Remarks
Lamp current
Lamp voltage
Lamp starting voltage
Oscillation frequency
IBL
2.0
5.0
VBLH
-
520
850
-
VS
1100
-
FO
50
-
at IBL=5.0mArms:
5.5 mArms
220cd/m2
Note3, Note4
-
Vrms
Note2, Note3
-
Vrms
Ta = 25°C
Note2, Note3
-
Vrms
Ta = -10°C
Note2, Note3
70
kHz
Note5
Note1: This product's backlight consists of 2 lamps, and these specifications are for each lamp.
Note2: The lamp voltage cycle between lamps should be kept on a same phase. "VS" and "VBLH"
are the voltage value between low voltage side (Cold) and high voltage side (Hot).
Note3: The asymmetric ratio of working waveform for lamps (Lamp voltage peak ratio, Lamp
current peak ratio and waveform space ratio) should be less than 5 % (See the following
figure.). If the waveform is asymmetric, DC (Direct current) element apply into the lamp. In
this case, a lamp lifetime may be shortened, because a distribution of a lamp enclosure
substance inclines toward one side between low voltage terminal (Cold terminal) and high
voltage terminal (Hot terminal).
Pa
Sa
0
Sb
Pb
Pa - Pb × 100 ≤ 5 %
Pb
Sa - Sb × 100 ≤ 5 %
Sb
Pa: Supply voltage/current peak for positive, Pb: Supply voltage/current peak for negative
Sa: Waveform space for positive part, Sb: Waveform space for negative part
Note4: This product consists of 2 lamps. 2 lamps contain in the 1 lamp holder, and both lamps are
connected to 1 low voltage cable. Lamp current must be 5.0mArms typical for each lamp,
and sum of 2 lamps must be 10mArms typical. The lamp current should be measured by
high-frequency current meter at the low voltage terminal.
Note5: In case "FO" is not the recommended value, beat noise may display on the screen, because
of interference between "FO" and "1/th". Recommended value of "FO" is as following.
FO =
1 × 1 × (2n-1)
4 th
th: Horizontal synchronous cycle (See "4.9 INPUT SIGNAL TIMINGS FOR LCD
PANEL SIGNAL PROCESSING BOARD".)
n: Natural number (1, 2, 3 ⋅⋅⋅⋅⋅⋅⋅⋅)
Note6: Method of lamp cable installation may invite fluctuation of lamp current and voltage or
asymmetric of lamp working waveform. When designing method of lamp cable installation,
evaluate the fluctuation of lamp current, voltage and working waveform sufficiently.
DATA SHEET DOD-PD-0072 (2nd edition)
9
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