Acer Aspire 1800 Aspire 1800 Service Guide - Page 36

Electrical Characteristics No . Item Symbol 1 Input voltage INV_PWR 2 Input current Iin 3 Lamp current IL Min. 10 -3.3 4 Lamp current IL 2.7 4 Frequency F 50 5 Output power Pout -- 6 Efficiency 7 Starting voltage 8 Starting time 9 Dispoff# 10 Limited lamp maximum current 11 PWM signal *Note 4 η 76% Vs 1600 Tvs 1 2.8 0 DAC- 0 BRIG INV_PWM 142 3.0 30 12 Lamp current I zero-PK -over-shoot 13 Current Waveform factor Ip I rms 14 Unbalance Rate Ip −I−p Irms 15 Turn off IHL current (Hight side) 16 Turn off Voff voltage 17 Voltage Rise time Trise 18 Voltage fall Tfall time 19 Lamp current balance L bal 1.27 -15% ----- Typ. 16 0.33 -- -60 -- --- -3.3 0.5 Max. 20 -6.8 Unit V A mA 6.3 mA 70 KHz 4.8 W -- -- --- V 1.5 Sec 3.6 V 0.8 V 3.3 V Comment Note 1 DAC=0V *Note 2 DAC= 0.5V * Note 3 When two lamps total 9.6W At 0 ° 'C Backlight on/off signal Low level *Note 2 150 3.3 -- -- 2 0 158 Hz PWM signal frequency 3.6 V PWM signal amplitude 100 % 20 % Duty = -----T----o---n-----Period Line transient (10.8V to 21V/100us) and turn on transient 1.56 Multipl e I−p or I rms *10 +15% Mulitpl e -- 0 A -- 150Vp V -p -- 300us us -- 300us us ±0.5mA PWM=40% PWM=40% PWM=40% PWM=40% PWM=40~100% 28 Chapter 1