NL6448BC33-59 NEC Electronics, NL6448BC33-59 Datasheet - Page 9

• Manufacturer Part Number: NL6448BC33-59
• Manufacturer: NEC Electronics

Specifications of NL6448BC33-59

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.3.2 Working for backlight lamp
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"
Note3: The asymmetric ratio of working waveform for lamps (Lamp voltage peak ratio, Lamp
Note4: This product consists of 2 lamps. 2 lamps contain in the 1 lamp holder, and both lamps are
Note5: In case "FO" is not the recommended value, beat noise may display on the screen, because
Note6: Method of lamp cable installation may invite fluctuation of lamp current and voltage or
Lamp current
Lamp voltage
Lamp starting voltage
Oscillation frequency
are the voltage value between low voltage side (Cold) and high voltage side (Hot).
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).
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.
of interference between "FO" and "1/th". Recommended value of "FO" is as following.
asymmetric of lamp working waveform. When designing method of lamp cable installation,
evaluate the fluctuation of lamp current, voltage and working waveform sufficiently.
Pb
Pa
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
FO =
Parameter
0
th: Horizontal synchronous cycle (See "4.9 INPUT SIGNAL TIMINGS FOR LCD
n: Natural number (1, 2, 3
PANEL SIGNAL PROCESSING BOARD".)
Sa
1
4
PRELIMINARY DATA SHEET DOD-PD-0090 (1st edition)
th
1
Symbol
VBLH
(2n-1)
IBL
Sb
VS
FO
1100
min.
850
2.0
50
-
)
typ.
520
5.0
-
-
-
Sa - Sb
Pa - Pb
Sb
Pb
max.
5.5
70
-
-
-
100 5 %
100 5 %
mArms
Vrms
Vrms
Vrms
Unit
kHz
NL6448BC33-59
at IBL=5.0mArms:
(Ta=
Note3, Note4
Note2, Note3
Note2, Note3
Note2, Note3
Ta = -10 C
Ta = 25 C
450cd/m
Remarks
Note5
25 C,
Note1)
2
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