Acer TravelMate 290 TravelMate 290E Service Guide - Page 36

Electrical Characteristics No . Parameter Symbol 1 Input voltage NV_PWR Min. 9 2 Input Iin -- current 3 Lamp IL 3.0 current 4 Lamp IL 2.7 current 4 Frequency F 45 5 Output power Pout 6 Efficiency η -80% 7 Starting Vs voltage 1600 8 Starting Tvs 1 time 9 Dispoff# 2.8 0 10 Limited DAC- 0 lamp BRIG maximum current 11 PWM signal *Note 4 INV_PW 142 M 3.0 30 12 Lamp I zero-PK -- current over-shoot 13 Current Waveform factor 1.27 Ip I rms 14 Unbalance -10% Rate Ip −I−p Irms 15 Turn off IHl -- current (Hight side) 15 Turn off Voff -- voltage (Low side) Typ. 14.8 0.33 --55 ----3.3 0.5 150 3.3 -- -- 2 0 -- -- Max. 21 Unit V -- A 6.8 mA 6.3 mA 65 KHz 4.5 W -- -- --- V 1.5 Sec 3.6 V 0.8 V 3.3 V Comment 7.5V (continuous) can work *Note 1 DAC=0V *Note 2 DAC=1V * Note 3 At 0'C Backlight on/off signal Low level *Note 2 158 Hz PWM signal frequency 3.6 V PWM signal amplitude 100 % Duty = -----T----o---n-----Period 10 % Line transient (10.8V to 21V/100us) and turn on transient 1.56 Multiple I−p or I rms *10 +10% Mulitple 0 A 150Vp- V p PWM=30% PWM=30% 28 Chapter 1