1 Hardware Overview
1.8
DC-AC INVERTER 12.1" (For 888F1R)
Description
The inverter is designed to light up the CCFL of LCD. Its input voltage is fixed at +5V. It
can also adjust the backlight by using a analog signal which comes from NS87570.
1.8.1
Features
Fixed input voltage : +5V
Automatic brightness compensation for input voltage variation
Remote ON/OFF control
Digital brightness control
Slim size 130x20x6.2 (mm)
1.8.2
Electrical characteristics
Ta=25°C
ITEM
Input
Input current
Efficiency
No load backlight
voltage
Lamp current
Driving frequency
PWM duty Cycle
PWM frequency
Operating temperature: 0°C∼55°C
Storage temperature : -20°C∼+80°C
Satellite 1700 Series Maintenance Manual
1.8 DC-AC INVERTER 12.1" (For 888F1R)
SYMBOL
MIN.
Vin
4.75
Iin
---
η
80
V CCFL
1000
I CCFL
2.0
f
40
D
30
pf
TYP.
MAX.
UNIT
4.90
5.05V
V
---
1.0
A
85
----
%
----
----
Vrms
----
6.0
mArms
50
60
KHz
100
%
150
Hz
COMMENT
Inverter control
Lamp current
range.
max. brightness
load
1-21