This inverter is designed to light up the CCFL of LCD for Travel Mate series notebook It should be su

No.

Supplier

Model

Type

1

AU

UB141X01

TFT, 14.1" XGA

2

CPT

CLAA141XF01

TFT, 14.1" XGA

3

AU

B150PG01

TFT, 15.0 SXGA+

4

Hitachi

TX38D91VC1FAC

TFT, 15.0" SXGA+

5

AU

B150XG01

TFT, 15.0" XGA

6

IBM

ITSX95C

TFT 15.0" SXGA+

7

Hannstar

HDS150PX14-A

TFT 15.0" XGA

There are two control signals that come form system to control lamp brightness. One signal is named DAC_BRIG, which limits current to meet LCD lamp current specification. Another one is named PWM, which adjusts lamp brightness. This inverter brightness is adjusted by PWM burst mode. The PWM burst mode is that turning on and off the lamp at rate of 150Hz. The effective brightness is a function of the duty cycle.

Features

  1. Wide range 9V to 21V input voltage.
  2. Birghtness adjustment by PWM duty mode.
  3. Close loop controls lamp current.
Electrical Characteristics

No

Parameter

Symbol

Min.

Typ.

Max.

Unit

Comment

1

Input voltage

NV_PWR

9

14.8

21

*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

F

45

55

65

KHz

* Note 3

5

Output power

Pout

--

--

4.5

W

6

Efficiency

n

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

%

„ . Ton Duty = -—— Period

12

Lamp current over-shoot

I zero-PK

10

%

Line transient (10.8V to 21V/100us) and turn on transient

Waveform factor

1 rms

1.27

72

1.56

or 1rms

14

Unbalance Rate

1rms

-10%

0

+10%

Mulitple

15

Turn off current (Hight side)

IHl

0

A

PWM=30%

15

Turn off voltage (Low side)

Voff

150Vp-p

V

PWM=30%

No

Parameter

Symbol

Min.

Typ.

Max.

Unit

Comment

16

Voltage Rise time (Low side)

Trise

300us

us

PWM=30%

17

Voltage fall time (Low side)

Tfall

300us

us

PWM=30%

NOTE:

  • 1. The inverter can work in 7.5V input voltage (continuous), but 7.5V electronic characteristic will not be care.
  • 2. Limited lamp maximum current by DAC_BRIC signal: 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. When add 1V DAC, the 100% Lamp current will decrease 0.5mA.

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

  • 3. Inverter operating frequency should be within specification (45~65kHz) 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 30%.
  • 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. Audio noise should be less than 36dB at 10cm distance.
Electrical specification

No

Symbol

Min.

Typ.

Max.

Unit

Comment

1

V oper*

--

650

--

Vrms

Lamp operating voltage (650+/-50)

Il

6.2

6.5

6.8

mArms

DAC_BRIG: 0 V, PWM: 100%

Il

3.0

3.3

3.6

mArms

DAC_BRIG: 0 V, PWM:30%

Il

5.7

6.0

6.3

mArms

DAC_BRIG: 0V, PWM:100%

Il

2.7

3.0

3.3

mArms

DAC_BRIG: 1V, PWM:30%

F

45

55

65

kHz

n

80%

--

--

--

Thermal

+2 -1

Responses

  • atte
    What voltage should a 5738g inverter putout?
    7 years ago
  • Jean
    What voltage should an aspire 5738g inverter put out?
    7 years ago

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