Acer Aspire 1430 Aspire 1400 Notebook Service Guide - Page 37

3. Automatic brightness compensation for input voltage variation. Electrical Characteristics No . Parameter Symbol Min. Typ. Max. Unit 1 Input NV_PWR 9 14.8 voltage 2 Input Iin -- 0.33 current 3 Lamp IL 2.7 -- current 4 Frequency f 50 55 5 Output Pout -- -- power 6 Efficiency η 80% -- 7 Starting Vs voltage 1500 -- 8 Starting Tvs 1 -- time 9 Dispoff# 2.8 3.3 0 0.5 10 Limited DAC- 0 lamp BRIG maximum current 11 PWM INV_PW 142 150 signal M *Note 4 30 3.3 40 -- 21 V -- A 6.6 mA 60KHz KHz 4.5 W -- -- --- V 2 Sec 3.6 V 0.8 V 3.3 V 158 Hz 3.6 V 100 % 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 -- 11 mA 1.56 Multiple 2 0 +10% Mulitple Conditions *Note 1 * Note 2 Backlight on/off signal Low level *Note 1 PWM signal frequency PWM signal amplitude Duty = -----T----o---n-----Period Line transient (10.8V to 21V/100us) and turn on transient or I−p I rms *10 NOTE: Please pay attention to the fellowing: *1. Limited lamp maximum current by DAC_BRIC signal: When DAC_BRIG voltage is 0V and INV_PWM enables (100%), lamp has max. current. When DAC_BRIG voltage is 3.3V and INV_PWM enables (100%), lamp has min. current. DAC_BRIG signal comes from system chipset with internal resistance of 3K Ω Chapter 1 31