Acer 270 - Manual (Page 36)

Chapter 1 31
3. Automatic brightness compensation for input voltage variation.
NOTE: Please pay attention to the fellowing:
*1. Limited lamp maximum current by DAC_BRIC signal:
Electrical Characteristics
No
.
Parameter Symbol Min. Typ. Max. Unit Comment
1 Input
voltage
NV_PWR 9 14.8 21 V
2 Input
current
Iin -- 0.33 -- A
3
Lamp
current
IL 2.7 -- 6.3 mA *Note 1
4
Frequency
F 45
55
65
KHz
* Note 2
5 Output
power Pout -- -- 4.5 W
6 Efficiency
η
80% -- -- --
7 Starting
voltage Vs 1600 -- --- V At 0’C
8 Starting
time Tvs 1 -- 1.5 Sec
9 Dispoff# 2.8 3.3 3.6 V Backlight on/off signal
0 0.5 0.8 V Low level
10 Limited
lamp
maximum
current DAC-
BRIG 0 3.3 V *Note 1
11 PWM
signal
*Note 4 INV_PW
M 142 150 158 Hz PWM signal frequency
3.0 3.3 3.6 V PWM signal amplitude
30 -- 100 %
12 Lamp
current
over-shoot I zero-PK -- -- 10 % Line transient (10.8V to
21V/100us) and turn on
transient
13 Current
Waveform
factor 1.27 1.56 Multiple
or *10
14 Unbalance
Rate -10% 0 +10% Mulitple
15 Turn off
voltage Voff -- -- 100Vp-
P V PWM=40%
16 Voltage
Rise time Trise -- -- 300us us PWM=40%
17 Voltage fall
time Tfall -- -- 300us us PWM=40%
Duty
Ton
Period
------------------- =
rms
p
I
I
2
rms
p
I
I
−
rms
p p
I
I I
−
−
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