When DAC_BRIG voltage is 0V and INV_PWM enables (100%), lamp has max. current.

When DAC_BRIG voltage is 3.3V and INV_PWM enables (100%), lamp has min. current.

DAC_BRIG signal comes from system chipset with internal resistance of 3K

*2. Inverter operating frequency should be within specification (45~65kHz) at max. and min. brightness load.

*3. 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 30%.

*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 be 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.

.

Electrical specification

No

Symbol

Min.

Typ.

Max.

Unit

Comment

.

 

 

 

 

 

 

 

 

 

 

 

 

 

1

V oper*

--

700

--

Vrms

Lamp operating voltage

 

Il

5.7

6.0

6.3

mArms

DAC_BRIG: 0V,

 

 

 

 

 

 

PWM:100%

 

Il

2.7

3.0

3.3

mArms

DAC_BRIG: 0V,

 

 

 

 

 

 

PWM:30%

 

F

45

55

65

kHz

 

 

 

 

 

 

 

 

 

η

80%

--

--

--

 

 

 

 

 

 

 

 

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.

LCD

Item

 

Specification

 

 

 

 

 

 

 

 

Vendor & model

AU UB

Samsung

Hannstar

Hannstar

IBM ITUX97C

name

141X03

LTN141XF-

HSD150PXII-

HSD150PKII-

 

 

 

L05

B

B

 

 

 

 

 

 

 

Mechanical Specifications

 

 

 

 

 

 

 

 

 

 

LCD display area

14.1

14.1

15.0

15.0

15.0

(diagonal, inch)

 

 

 

 

 

 

 

 

 

 

 

Display technology

TFT

TFT

TFT

TFT

TFT

 

 

 

 

 

 

Resolution

XGA

XGA

XGA

SXGA+

UXGA

 

(1024x768)

(1024x768)

(1024x768)

(1400x1050)

(1600X1200)

 

 

 

 

 

 

32

Chapter 1

Page 37
Image 37
Acer 270 manual Electrical specification, Thermal

270 specifications

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