NL6448BC33-53 データシートの表示（PDF） - NEC => Renesas Technology
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NL6448BC33-53 Datasheet PDF : 29 Pages
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NL6448BC33-53
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
at IBL=5.0mArms:
IBL
2.0
5.0
5.5 mArms
350cd/m2
Note3
VBLH
-
520
-
Vrms
Note2, Note3
850
-
VS
TBD
-
-
Vrms
-
Vrms
Ta = 25°C
Note2, Note3
Ta = -10°C
Note2, Note3
FO
50
-
70
kHz
Note4
2
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 (Power supply voltage peak ratio,
power supply 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: 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 cycle (See "4.9 INPUT SIGNAL TIMINGS FOR LCD PANEL
SIGNAL PROCESSING BOARD".)
n: Natural number (1, 2, 3 ⋅⋅⋅⋅⋅⋅⋅⋅)
Note5: Method of lamp cable installation may invite fluctuation of lamp current and voltage or
asymmetric of lamp working waveform. When design the backlight inverter, evaluate the
fluctuation of lamp current and voltage or asymmetric of lamp working waveform
sufficiently.
PRELIMINARY DATA SHEET DOD-M- 1309 (2nd edition)
9
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