LX1689
I N T E G R A T E D
P R O D U C T S
Third Generation CCFL Controller
P
RODUCTION
D
ATA
S
HEET
TYPICAL APPLICATION
3.0V < V
BATT
< 5V
V
BATT
GND
BRITE
ENABLE
WWW .
Microsemi
.C
OM
C1
100nF 16V
Nominal 3.2V to 4.2V
U2 FDC6305N
6
FAIRCHILD
T1 SGE2697-1
MICROSEMI
1
2
6
Lamp
C8
100nF
50V
Lamp
1
4,5
3
275V
RMS
±
I
OUT
= 3.5m
100kHz
1:53
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%
LMT1410
C9*
2pF
C4
100nF 16V
C3
100nF 16V
VDD_A
3
4
+
C6
100µF
10V 20%
TANT
R5
10
2,5
GND
AOUT
VDD_A
VDD_P
VDD_A
V
BATT
OC_SNS
OV_SNS
I_SNS
BRITE_OUT
EA_OUT
EA_IN
I_R
BOUT
DIM_CLK
DIM_MODE
DIV_248
C2
BRITE_C
100nF 16V
BRITE_R
R1
6.65
K 1%
C11
1.0uF 10V
10%
Alternate Maximum Lamp Current Table
Lamp current | R1 value |
4.0mArms
3.5mArms
3.0mArms
2.5mArms
2.0mArms
1.5mArms
| 6.65K 1%
| 6.65K 1%
| 6.65K 1%
| 11.8K 1%
| 11.8K 1%
| 11.8K 1%
R7 Value
| 221 1%
| 255 1%
| 294 1%
| 200 1%
| 249 1%
| 332 1%
N.C.
R4
10K
C5
470pF 16V
C7
1nF
16V
R3
4.99K 1%
R6
120
C10
1.5nF
25V 5%
COG
R7
255Ω 1%
BRITE_IN
ENABLE
Enable input
Logic Level: 2.5V to 3.3V
ON: Logic 'HI' = >1.5V
OFF: Logic 'LOW' =< 0.8V
LX1689CPW
R2
51.1K
1%
*C9 PCB C
APACITOR COPPER AREAS TO EQUAL
APPROXIMATELY
34
2
MM FOR
0.80
MM THICK
PCB
PCB CAP
AREA FORMULA
(K
TYPICIALLY
= 5.35)
A
REA
(
MM
²) = D(mm) x C x 113097 E
+9
/ K
F
IGURE
2
– LX1689 Typical 1W Application
DIMMING TABLE
DIM_MODE
DIM_CLK
VDD_A
External Clock Source
DIMMING MODE
External Burst
Dimming from divided
DIM_CLK input
DIMMING POLARITY*
Conventional
Floating or VDD_A/2
VDD_A
Analog Dimming
Conventional
Floating or VDD_A/2
GND
Analog Dimming
Internal Burst
Dimming from divided
Run Frequency
Internal Burst
Dimming from Divided
Run Frequency
Reverse
GND
GND
VDD_A
GND
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. 1.0b, 2003-03-31
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
MICROSEMI [ MICROSEMI CORPORATION ]
