LX1689 datasheet(9/14 Pages) MICROSEMI

9 / 14 page

Microsemi

Integrated Products

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 9

Rev. 1.1, 2006-02-27

LX1689

Third Generation CCFL Controller

PRODUCTION DATA SHEET

TY PICAL APPLICATION

120

470pF 16V

51.1K

4.99K 1%

100nF 16V

100µF

10V 20%

TANT

100nF

50V

C9*

2pF

C10

1.5nF

25V 5%

COG

255

Ω 1%

100nF 16V

6.65

K 1%

BATT

GND

BRITE

ENABLE

Lamp

GND

I_R

EA_OUT

EA_IN

BRITE_OUT

I_SNS

OV_SNS

OC_SNS

BATT

VDD_A

VDD_P

ENABLE

BRITE_IN

BRITE_R

BRITE_C

DIV_248

DIM_MODE

DIM_CLK

AOUT

BOUT

3.0V < V

BATT < 5V

1nF

16V

T1 SGE2697-1

MICROSEMI

1:53

LMT1410

275V

RMS ±

OUT = 3.5m

100kHz

Nominal 3.2V to 4.2V

N.C.

U2 FDC6305N

FAIRCHILD

*C9 PCB CAPACITOR COPPER AREAS TO EQUAL

APPROXIMATELY

342MM FOR 0.80MM THICK PCB

PCB CAP AREA FORMULA (K TYPICIALLY = 5.35)

AREA(MM²) = D(mm) x C x 113097 E+9 / K

10K

VDD_A

C11

1.0uF 10V

10%

VDD_A

Enable input

Logic Level: 2.5V to 3.3V

ON: Logic 'HI' = >1.5V

OFF: Logic 'LOW' =< 0.8V

BRITE Input Control Range

(Linear DC)

Min. Brite 'LO' <= 0.50V

Max. Brite 'HI' >= 2.00V

(2.5V to 3.3V Logic PWM)

Min. Brite Pos Duty <= 1.6%

Max. Brite Pos Duty >= 92%

PWM freq 7.5Khz to 100Khz

Burst Rate Freq: 195Hz ± 4%

Alternate Maximum Lamp Current Table

Lamp current | R1 value | R7 Value

4.0mArms | 6.65K 1% | 221 1%

3.5mArms | 6.65K 1% | 255 1%

3.0mArms | 6.65K 1% | 294 1%

2.5mArms | 11.8K 1% | 200 1%

2.0mArms | 11.8K 1% | 249 1%

1.5mArms | 11.8K 1% | 332 1%

LX1689CPW

2,5

4,5

FIGURE 2 – LX1689 Typical 1W Application

DIMMING TABLE

DIM_MODE

DIM_CLK

DIMMING MODE

DIMMING POLARITY*

VDD_A

External Clock Source

External Burst

Dimming from divided

DIM_CLK input

Conventional

Floating or VDD_A/2

VDD_A

Analog Dimming

Conventional

Floating or VDD_A/2

GND

Analog Dimming

Reverse

GND

VDD_A

Internal Burst

Dimming from divided

Run Frequency

Conventional

GND

Internal Burst

Dimming from Divided

Run Frequency

Reverse

* Conventional polarity means that the lamp brightness increases with increasing voltage on the BRITE_IN pin.

Reverse polarity means that brightness decreases with increasing voltage.

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