Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
Copyright © 2000
Rev. 1.1, 2006-02-27
WWW.Microsemi .COM
LX1689
Third Generation CCFL Controller
TM
®
ELECTRICAL CHARACTERISTICS (CONTINUED)
LX1689
Parameter Symbol Test Conditions
Min Typ Max
Units
`
ANALOG DIMMER BLOCK
BRITE_IN Input Current BRITE_IN
II
BRITE_IN = 0 to 5V -1 1 µA
BRITE_IN < 0.45V 20 52 100 mV
BRITE_IN > 2.05V; T
A
= 25°C 0.96 1.04 1.12 V
Conventional Dimming
BRITE_OUT
BRITE_IN >
2.05V 0.94 1.04 1.14 V
BRITE_IN < 0.45V; T
A
= 25°C 0.98 1.06 1.14 V
BRITE_ IN < 0.45V 0.96 1.06 1.16 V
Reverse Dimming
BRITE_OUT
BRITE_IN >
2.05V 10 62 120 mV
`
DIGITAL DIMMER BLOCK
Minimum Duty Cycle; BRITE_IN ≤ 0.55V 2 10 15 %
Maximum Duty Cycle; BRITE_IN =1.90V 85 92 100 %
Conventional Dimming
Duty Cycle
Maximum Duty Cycle; BRITE_IN ≥ 1.95V 100 %
Maximum Duty Cycle; BRITE_IN ≤ 0.55V 100 %
Maximum Duty Cycle; BRITE_IN = 0.6V 85 92 100 %
Reverse Dimming
Duty Cycle
Minimum Duty Cycle; BRITE_IN ≥ 1.95V 2 10 15 %
`
TIMING GENERATOR BLOCK
Number of Lamp Return Current
Cycles before Run Mode
N
IGNITE
To switch to Run Mode 8 Cycles
I_SNS Run Mode Checking Interval Lamp return current cycles, 8192 x 1 /f
O
126 mS
Fault Comparator Threshold Voltage I_ SNS Open Lamp Fault Detect, T
A
=25°C 250 305 350 mV
PK
Number of Strike sweep Attempts
Before Fault Shutdown
N
STRK_FAULT
FLAMP Sweep Cycles, I_SNS = 0V_SNS = 0V 15
Power On Delay Before Strike T
D_PWRON
16384 X Lamp Run Period 252 ms
Number of Sweeping Strike Frequency
Steps per Attempt
1024 Steps
Number of Output Pulses per Striking
Step
16 Cycles
`
LAMP FEEDBACK CONDITIONING BLOCK
I_SNS =10V 80 150 µA
I_SNS Input Current I_SNS
IIN
I_SNS = -10V -200 -350 µA
OV_SNS Input High Threshold V
TH_OV_SNS
Active Over Voltage Protection ± 2 ± 2.2 V
PK
OV_SNS Input Low Threshold V
TL_OV_SNS
Inactive Over Voltage Protection ± 1.8 ± 2 V
PK
OV_SNS = 10V 260 400 µA
OV_SNS Input Current OV_SNS
IIN
OV_SNS = -10V -320 -450 µA
OC_SNS Input High Threshold V
TH_OC_SNS
Active Over Current Protection ± 2 ± 2.2 V
PK
OC_SNS Input Low Threshold V
TL_OC_SNS
Inactive Over Voltage Protection ± 1.8 ± 2 V
PK
OC_SNS = 10V 45 80 µA
OC_SNS Input Current OC_SNS
IIN
OC_SNS = -10V -110 -180 µA
I_SNS = 0.3VDC, T
A
= 25°C 0.27 0.31 0.35 V
I_SNS = 2.0VDC, T
A
= 25°C 1.95 2 2.05 V
I_SNS = -0.3VDC, T
A
= 25°C 0.24 0.3 0.36 V
Full Wave Rectifiers RMS Transfer I_SNS
RMS
I_SNS = -2.0VDC, T
A
= 25°C 1.75 1.9 2.05 V
E
E
L
L
E
E
C
C
T
T
R
R
I
I
C
C
A
A
L
L
S
S
