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7. VP-531 POWER BOARD
A. Description
The VP-531 power board is designed for lighting up the back-lights of LCD module.
B. Electrical characteristics
B-1 FOR HANNSTAR PANEL
INPUT VOLTAGE
INPUT CURRENT
NO LOAD BACKLIGHT
VOLTAGE
LAMP CURRENT
DRIVING FREQUENCY
EFFICIENCY
Operating Life Time
Note:
Life time(Hr) can be defined as the time in which it continues to operate under the
condition:
Ta=25 3 C, I
1. When the brightness becomes 50%
2. When the startup voltage (Vs) at 0 C becomes higher than the maximal value of
Vs specified above
B-2 DC/DC power
B.2.1 Input
12V
B.2.2 Output
Item
Output voltage
Vcc
5V
B.2.3 Efficiency:78% typ. at maximum load.
MIN.
11.4V
--------
--------
3mA rms.
40KHz
--------
50,000
=6.0Ma(ms) and f
=30 KHz until one of the following event occurs:
L
L
max. load Min. load tolerence
1.2A
0.1A
17
TYP.
MAX.
12V
12.6V
0.85A
1A
640V rms.
--------
6mA rms.
7mArms
55KHz
70KHz
75%
--------
-------
--------
ripple & noise(max.)
150Vpp
COMMENT
Vin=12V MAX.
BRIGHTNESS
Vin = 12V
Hours (noto)
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