NOTE:
*1. The display can not happen flicker or shutdown.
*2. Limited lamp maximum current by DAC_BRIC signal:
DAC_BRIG signal comes from system with internal resistance of 3K Ω .
When add 1V DAC, the 100% Lamp current will decrease 0.5mA.
Lamp limited current | DAC_BRIG | INV_PWM |
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Max. | 0V | 100% |
Min. | 3.3V | 100% |
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*3. Inverter operating frequency should be within specification (50~70kHz) at max. and min. brightness load.
*4. INV_PWM enable implies INV_PWM signal is High level (On duty cycle is 100%). It is a square wave of 150Hz to adjust backlight brightness that is a function of PWM duty cycle. Backlight brightness is maximum value under INV_PWM at 100% and brightness is minimum under INV_PWM at 40%.
*5.The system interface signals belong to 3.3V.
*6. Please make sure open lamp output voltage should be within starting voltage specification.
*7. Inverter should pass human body safety test.
*8. Inverter should be no smoking by any component open/short test.
*9. Transformer voltage stress should not be over 85% under any condition. (turn on overshoot transient and line transient.)
*10. Inverter should without acoustic at 10cm distance..
Electrical specification
No | Symbol | Min. | Typ. | Max. | Unit | Comment | |
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| V oper* | 785 | Vrms | Lamp operating voltage | |||
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| IL | 6.2 | 6.5 | 6.8 | mArms | DAC_BRIG: 0 V, PWM: | |
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| 100% | |
1 |
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IL | 3.3 | 3.6 | 3.9 | mArms | DAC_BRIG: 0 V, | ||
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| PWM:40% | |
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| IL | 5.7 | 6.0 | 6.3 | mArms | DAC_BRIG: 0.5V, | |
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| PWM:100% | |
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| IL | 3 | 3.3 | 3.6 | mArms | DAC_BRIG: 0.5V, | |
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| PWM:40% | |
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| f | 50 | 60 | 70 | kHz |
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| η | 76% |
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Thermal
All components on inverter board should follow below rules:
1.Component using conditions (component stress) must be within component specification including voltage rating, current rating, temperature etc.
2.Component temperature should follow below:
∆T <=40° C, at 25° C and without airflow.
Component temperature can’t the Bezel deformed of system.
Chapter 1 | 29 |