Toshiba Satellite 1700 Series, Руководство по обслуживанию

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1 Hardware Overview 1.9 DC-AC INVERTER 12.1” (For 888F1A)
Satellite 1700 Series Maintenance Manual 1-23
1.9 DC-AC INVERTER 12.1” (For 888F1A)
1.9.1 Description
The inverter is designed to light up the CCFL of LCD. The input voltage is fixed at +5V. It
can also adjust the backlight by using an analog signal that comes from NS87570.
1.9.2 Features
Fixed input voltage : +5V
Automatic brightness compensation for input voltage variation
Remote ON/OFF control
Digital brightness control
Slim size 130x20x6.2 (mm)
1.9.3 Electrical characteristics
Ta=25
°
C
ITEM SYMBOL MIN. TYP. MAX. UNIT COMMENT
Input Vin 4.75 4.9 5.05 V
Input current Iin --- --- 1.0 A
Efficiency
η
80 85 ---- %
No load backlight
voltage VCCFL 1000 ---- ---- Vrms
Lamp current ICCFL 3.0 ---- 6.0 mArm
s Inverter control
Lamp current range.
Driving frequency f 40 50 60 KHz max. brightness load
PWM duty Cycle D 30 100 %
PWM frequency pf 150 Hz
Operating temperature : 0
°
C
∼
55
°
C
Storage temperature : -20
°
C
∼
+80
°
C