JHT01 Service Manual
4-13
PWM burst mode. The PWM burst mode is that turning on and off the lamp at a
rate of 150Hz. The effective brightness is a function of the duty cycle.
4.1 Features
•
Wide range 9V to 21V input voltage
• Brightness adjustment by PWM burst mode.
•
Close loop controls lamp current.
4.2 Absolute maximum rating
• Environment temperature:
Operating temperature: 0°C ~ 55°C
Storage temperature: -20°C ~ 70°C
Humidity: 0 ~ 90% without condensation
MTBF: MIN 50000 hours. (In Compal system)
4.3 Electrical characteristic
No Item Symbol Min. Typ. Max. Unit Comment
1 Input voltage INV_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 1.4.1.1.1 DAC=1V
5 Frequency F 45 55 65 KHz *Note 3
6 Output power Pout -- -- 4.5 W
7 Efficiency
η
80% -- -- --
8
Starting
voltage
V
s
1600 -- -- V At 0’C
9 Starting time Tvs 1 -- 1.5 Sec
2.8 3.3 3.6 V Backlight on/off signal
10 Dispoff#
0 0.5 0.8 V Low level
11
Limited lamp
maximum
current
DAC-
BRIG
0 3.3 V *Note 2
142 150 158 Hz PWM signal frequency
12
PWM signal
*Note 4
INV_PW
M
3.0 3.3 3.6 V PWM signal amplitude
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