Toshiba Satellite 1700 Series Maintenance Manual page 47

1 Hardware Overview
1.14 INVERTER 14.1" (For 888F1P)
1.14.1 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 PWM signal, which is controlled by the PC87570 of
motherboard.
1.14.2 Features
Fixed input voltage : +5V
Automatic brightness compensation for input voltage variation
Remote ON/OFF control
Slim size 105x13.5x6.2(mm)
1.14.3 Electrical characteristics
Ta=25°C
ITEM
Input
Input current
Efficiency
No load backlight
voltage
Peak lamp current
PWM Duty Cycle
PWM Frequency
Driving frequency
Operating ambient temperature : 0°C∼55°C
Storage ambient temperature : -20°C∼+80°C
Satellite 1700 Series Maintenance Manual
SYMBOL MIN. TYP.
Vin 4.75 4.9
Iin --- ---
η
80 85
VCCFL 1000 ---
ICCFL 3.0 ---
D 30 ----
Pf ---- 150
f 40 50
1.14 INVERTER 14.1" (For 888F1P)
MAX. UNIT
5.05 V OPERATING
VOLTAGE
1.0 A
---- %
---- Vrms
6.0 mArms Lamp Current range
100 %
---- HZ
60 KHZ
COMMENT
1-33