LX1689 Ver la hoja de datos (PDF) - Microsemi Corporation
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LX1689 Datasheet PDF : 14 Pages
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LX1689
TM
®
Third Generation CCFL Controller
PRODUCTION DATA SHEET
TYPICAL APPLICATION
VBATT
GND
BRITE
ENABLE
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%
3.5mArms | 6.65K 1%
3.0mArms | 6.65K 1%
2.5mArms | 11.8K 1%
2.0mArms | 11.8K 1%
1.5mArms | 11.8K 1%
| 221 1%
| 255 1%
| 294 1%
| 200 1%
| 249 1%
| 332 1%
C1
100nF 16V
VDD_A
3.0V < VBATT < 5V
Nominal 3.2V to 4.2V
U2 FDC6305N
FAIRCHILD 6
1
C4
VDD_A
4
100nF 16V
C3
100nF 16V
GND
AOUT
BOUT
DIM_CLK
VDD_P
VDD_A
VBATT
OC_SNS
3
R5
2,5
10
C11
1.0uF 10V
10%
T1 SGE2697-1
MICROSEMI
1
6
C8
2
100nF
4,5 50V
3
1:53
LMT1410
C9*
2pF
C6
+
100µF
10V 20%
TANT
DIM_MODE OV_SNS
N.C.
DIV_248
I_SNS
C2 BRITE_C
100nF 16V
R1
BRITE_R
6.65K 1%
BRITE_IN
BRITE_OUT
EA_OUT
EA_IN
R4
10K
C5
470pF 16V
C7
1nF
16V
R3
4.99K 1%
R6
120
C10
1.5nF
25V 5%
COG
Lamp
Lamp
275VRMS ±
IOUT = 3.5m
100kHz
R7
255Ω 1%
Enable input
Logic Level: 2.5V to 3.3V
ON: Logic 'HI' = >1.5V
OFF: Logic 'LOW' =< 0.8V
ENABLE
I_R
LX1689CPW
R2
51.1K
1%
*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
FIGURE 2 – LX1689 Typical 1W Application
DIMMING TABLE
DIM_MODE
VDD_A
Floating or VDD_A/2
DIM_CLK
External Clock Source
VDD_A
DIMMING MODE
External Burst
Dimming from divided
DIM_CLK input
Analog Dimming
DIMMING POLARITY*
Conventional
Conventional
Floating or VDD_A/2
GND
Analog Dimming
Reverse
GND
GND
VDD_A
GND
Internal Burst
Dimming from divided
Run Frequency
Internal Burst
Dimming from Divided
Run Frequency
Conventional
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.
Copyright © 2000
Rev. 1.1, 2006-02-27
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
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