Toshiba Satellite 1700 Series, Maintenance Manual, Page: 49 / 156

1 Hardware Overview 1.15 INVERTER 14.1” (E)
Satellite 1700 Series Maintenance Manual 1-35
1.15 INVERTER 14.1” (E)
1.15.1 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.
1.15.2 Features
Fixed input voltage : +5V
Automatic brightness compensation for input voltage variation
Remote ON/OFF control
Slim size 105x13.5x6.2(mm)
1.15.3 Electrical characteristics
Ta=25
°
C
ITEM SYMBOL MIN. TYP. MAX. UNIT COMMENT
Input Vin 4.75 4.9 5.05 V OPERATING
VOLTAGE
Input current Iin --- --- 1.0 A
Efficiency
η
80 85 ---- %
No load backlight
voltage VCCFL 1000 --- ---- Vrms
Peak lamp current ICCFL 3.0 --- 6.5 mArms Lamp Current range
PWM Duty Cycle D 30 ---- 100 %
PWM Frequency Pf ---- 150 ---- HZ
Driving frequency f 40 50 60 KHZ
Operating ambient temperature : 0
°
C
∼
55
°
C
Storage ambient temperature : -20
°
C
∼
+80
°
C