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
BLOCK DIAGRAM
WWW .
Microsemi
.C
OM
V_BATT
ENABLE & BIAS
GENERATOR
BLOCK
PW M CONTROL
BLOCK
RAMP_D
OUTPUT DRIVERS BLOCK
AO UT
O UTPUT
STEERING
LOGIC
ENABLE
SLEEP
SHUTDOW N
VDD_A
DUAL LDO
10K
FAULT
5.3V
BOUT
+
RAMP_C
VDD_P
UVLO BIAS
2.0V
REF
-
BRITE_OUT
10K
2.95V
EA_OUT
+
-
PW R_GD
DIM CLOCK
IGNITE
ERROR
AMP
I_R
DIGITAL DIM
0.5V
50K
EA_IN
BRITE_IN
-
F EXT
2.0V
+
50K
100K
75K
100K
+
-
DDIM
LAMP FEEDBACK
CONDITIONING BLOCK
0.5V
VDD_A
-
+
2.0V
-
+
I_SNS
LSNS
RECTIFIER
OC_SNS
OC_SNS
RECTIFIER
OV_SNS
OV_SNS
RECTIFIER
BRITE_C
FAULT
0.5V
-
+
ANADIM
100K
200K
BRITE_O UT
VDD_A
-
+
BRITE_R
I
1
-
1V
-
+
RESET
+
-
300m V
GND
200K
I
1
DIM _CLK
+
6BIT
VDAC
6 BIT
COUNTER
RUN MODE
FAULT DET
STRIKE MO DE
FAULT DET
DIM _ M ODE
3 STATE
DECODER
DIV_248
3 STATE
DECODER
EXT
ANLG
INT
MUX
&
DIV
N
R
STRIKE
DETECTION
BLOCK
FAULT
IGNITE
B
LOCK
D
IAGRAM
B
LOCK
D
IAGRAM
Q
Q
D
Q S
R
RS
RMP_D OUT
20 BIT
COUNTER &
POW ER ON
RESET LOGIC
10 BIT
REGISTER
10 BIT
IDAC
DIGITAL DIM
ANALOG DIM
RAMP
GENERATO R
RAMP_C
TIMMING
GENERATOR
BLOCK
DIMMING
CONTROL
BLOCK
F
IGURE
1
– Simplified Block Diagram
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 8
MICROSEMI [ MICROSEMI CORPORATION ]
