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30 Chapter 1
Electrical Characteristics
No
.
Parameter Symbol Min. Typ. Max. Unit Comment
1 Input
voltage
NV_PWR 9 14.8 21 V 7.5V (continuous) can
work
*Note 1
2 Input
current
Iin -- 0.33 -- A
3
Lamp
current
IL 3.0 -- 6.8 mA DAC=0V
*Note 2
4
Lamp
current
IL 2.7 -- 6.3 mA DAC=1V
4
Frequency
F45
55
65
KHz
* Note 3
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 2
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
current
(Hight
side)
IHl----0APWM=30%
15 Turn off
voltage
(Low side)
Voff -- -- 150Vp-
p
V PWM=30%
Duty
Ton
Period
-------------------
=
rms
p
I
I
2
rms
p
I
I
−
rms
pp
I
II
−
−
SG_TM420_Ch1.fm Page 30 Thursday, September 26, 2002 9:23 AM