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32 Chapter 1
*2. Inverter operating frequency should be within specification (51-59kHz) at max. and min.
brightness load.
*3. INV_PWM enable implies INV_PWM signal is High level (On duty cycle is 100%). It it 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%.
*4.The system interface signals belong to 3.3V.
*5. Please make sure open lamp output voltage should be within starting voltage specification.
*6. Inverter should pass human body safety test.
*7. Inverter should no smoking by any component open/short test.
*8. Transformer voltage stress should not be over 85% under any condition.
(turn on overshoot transient and line transient.)
*9. Audio noise should be less than 36dB at 10cm distance.
.
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 shold follow below:
! ∆T <=30 degree C, at 25, 35 degree C.
! Component temperature should be less than 70 degree C inside system at 35 degree C.
Electrical specification
No
.
Symbol Min. Typ. Max. Unit Comment
1 V oper* -- 680 -- V
Il 6.0 6.3 6.6 A
Il 2.7 3.0 3.3 mArms Enable= H,
PWM Duty = 100%
V
100 mArms Enable = H,
PWM Duty = 30%
Voltage form Falling
and Rising time
300 Vrms
At IL = 5.5 mArms
f 505560kHz*2
η 80% 85% -- --
LCD
Item Specification
Vendor & model
name
AU UB
141X03
Samsung
LTN141XF-
L05
Hannstar
HSD150PXII-
B
Hannstar
HSD150PKII-
B
IBM ITUX97C
Mechanical Specifications
LCD display area
(diagonal, inch)
14.1 14.1 15.0 15.0 15.0
Display technology TFT TFT TFT TFT TFT
Resolution XGA
(1024x768)
XGA
(1024x768)
XGA
(1024x768)
SXGA+
(1400x1050)
UXGA
(1600X1200)