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PDF LX1688CPW Data sheet ( Hoja de datos )
| Número de pieza | LX1688CPW | |
| Descripción | MULTIPLE LAMP CCFL CONTROLLER | |
| Fabricantes | Microsemi Corporation | |
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RangeMAX™
LX1688
INTEGRATED PRODUCTS
MULTIPLE LAMP CCFL CONTROLLER
DESCRIPTION
The LX1688 is a fixed frequency,
dual current/voltage mode, switching
regulator that provides the control
function for Cold Cathode Fluorescent
Lighting (CCFL). This controller can
be used to drive a single lamp, but is
specifically designed for multiple lamp
LCD panels. The IC can be configured
as a master or slave and synchronize up
to 12 controllers.
The LX1688 includes highly
integrated universal ‘PWM or DC’
dim input that allows either a PWM or
DC input to adjust brightness without
requiring external conditioning, since a
single external capacitor CPWM can
be used to integrate a PWM input.
Burst mode dimming is possible if the
user supplies a low frequency PWM
signal on the BRITE input and no
CPWM capacitor is used. The
controller utilizes Linfinity’s patented
direct drive fixed frequency topology
and patented resonant lamp strike
generation technique.
Safety and reliability features
include a dual feedback control loop that
permits regulation of maximum lamp
strike voltage as well as lamp current.
Regulating maximum lamp voltage
permits the designer to provide for ample
worst-case lamp strike voltage while
conservatively limiting maximum open
circuit voltage. In addition the controller
features include auto shutdown for an
open or broken lamp, and a lamp fault
detection with a status reporting output.
To improve design flexibility the IC
includes the ability to select the polarity
of both the chip enable and dim (BRITE)
inputs. Also included is a switched VDD
output of up to 10mA that will allow the
user to power other circuitry that can be
switched on and off with the inverters
enable input. This preserves the micro
power sleep mode with no additional
components.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
DIM M ING (BRITE)
ENABLE
LAMPS
IN PUT
CONNECTOR
LX1688
MASTER
KEY FEATURES
Provision to synchronize lamp
current & frequency with other
controllers
Dimming with analog or digital
(PWM) methods (>20:1)
Programmable Fixed frequency
Adjustable Power-up reset
ENABLE/BRITE Polarity Selection
Voltage limiting on step-up
transformer secondary winding
Open lamp timeout circuitry
Switched VDD output (10mA)
Micro-Amp Sleep Mode
Operates with 3.3V to 5V Supply
100mA output drive capability
APPLICATIONS/BENEFITS
Desktop LCD Monitors
Multiple lamp panels
Low Ambient Light Displays
High Efficiency
Lower Cost than Conventional
Buck/Royer Inverter Topologies
Improved Lamp Strike Capability
Improved Over-Voltage Control
FAULT 1
FAULT 2
Copyright 2001
Rev. 1.1a, 2003-03-21
FAULT 1
ENABLE
BRITE
STRIKE
STATUS
125 Hz 5% Duty cycle Burst
65KHz run frequency
LX1688
SLAVE
VDD
FAULT 2
S T R IK E
STATUS
Ch3 10.0mV Ω
Ch2 10.0mV Ω M 100µs
Simplified quad lamp inverter showing synchronized output waveforms
TJ (°C)
0 to 70
-40 to 85
PACKAGE ORDER INFO
MIN VDD
PWMAX VDD
Plastic TSSOP
24-Pin
3.0V
5.5V
LX1688CPW
3.0V
5.5V
LX1688IPW
Microsemi
Integrated Products, Power Management
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
RangeMAX™
LX1688
INTEGRATED PRODUCTS
MULTIPLE LAMP CCFL CONTROLLER
CHARACTERISTIC CURVES
Typical Operating Current (VDD)
6
5.5
VDD=5.5V
5
4.5
VDD=3V
4
3.5
3
-40 -15 10 35
Temperature (°C)
60
85
ISNS Input Threshold Voltage Vs Temperature
380
360
340
320
VDD=5.5V
300
280
260
240 VDD=3V
220
200
180
-40 -15 10 35 60 85
Temperature (°C)
Output Frequency Vs Temperature
70
68
VDD=5V
66
64
62
VDD=3V
60
58
56
-40
-15
10 35
T emperature (°C)
60
85
Under Voltage Lockout Vs Temperature
2.9
2.85 Turn On
2.8
2.75
2.7
2.65 Turn Off
2.6
2.55
2.5
-40
-15
10 35
Temperature (°C)
60
85
I_R Voltage Vs Temperature VDD=V
1.010
1.008
1.006
1.004
1.002
1.000
0.998
0.996
-40
-15 10
35
Temperature (°C)
60
85
Power-on-Reset Pulse Width Vs Temperature VDD=5V
40
35
30
25
20
15
-40 -15 10 35 60 85
Temperature (°C)
Copyright 2001
Rev. 1.1a, 2003-03-21
Microsemi
Integrated Products, Power Management
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page 
RangeMAX™
LX1688
INTEGRATED PRODUCTS
MULTIPLE LAMP CCFL CONTROLLER
TYPICAL SLAVE APPLICATIONS
CN
1
VIN
1
VIN
2
GND
3
GND
4
5
VBRITE
6
7 RM P_RST
PHA_SYNC
8
9 ENABLE
VDDSW
10
C1
470nF 16V
10%
VDDP
C2
470nF 16V
10%
VDD
VBRITE
C3 10nF
16V 10%
RMP_RST
PHA-SYNC
1
2
3
4
5
6
7
8
R1 9
80.6K 1%
10
11
12
AOU
T
VSS_P
VSS
BOU
T
VDD_P
VDD
BEPOL
B R IT E
CPOR
VDD_SW
T R I_
C
OLSNS
ENABLE
I_R
IS N S
IC O M P
CPWM1 VCOMP
CPWM2
VSNS
RMP_RST SLAVE
FAUL
PHA_SYNC
T
24
23
R2
47
22
VDDSW
21
20 C6
19
18
17
16 C10
15
14
13
R3
220
C5
C7
C8
C9
C11
C5 : 220nF 16V 10%
C6 : 82nF 16V 10%
C7 : 100nF 16V 10%
C8 : 2.2nF 50V 5%
C9 : 4.7nF 16V 10%
C10-11 : 10nF 16V 10%
Master
LED1
VDD
C4
220nF
16v 10%
Power
Output
Section
CN1
VIN
1
VIN
2
GND
3
GND
4
5
VBRITE
6
RM P _RST
7
PHA_SY NC
8
9 ENABLE
10 VDDSW
C1a
470nF 16V
10%
C2a
470nF 16V
10%
VDD
VBRITE
1
2
3
4
5
C3a 10nF
16V 10%
6
7
8
R1a
9
80.6K 1%
10
RMP_RST
P H A -S YN C
11
12
C5a: 220nF 16V 10%
C6a: 82nF 16V 10%
C7a: 100nF 16V 10%
C8a: 2.2nF 50V 5%
C9a: 4.7nF 16V 10%
C10-11a: 10nF 16V 10%
Slave 1
VDDP
AOU
T
VSS_P
VSS
BOU
T
VDD_P
VDD
BEPOL
B R IT E
CPOR
VDD_SW
T R I_
C
OLSNS
ENABLE
IS N S
I_R ICOMP
CPWM1 VCOMP
CPWM2
VSNS
RMP_RST SLAVE
FAUL
PHA_SYNC
T
24
23
R2a
47
22
VDDSW
21
C5a
20 C6a
19 C7a
18 C8a
17
C9a
16 C10a
15
C11a
14
13
R3a
220
VDD
C4a
220nF
16v 10%
VDDSW
LED1a
R13a
100K
Power
Output
Section
CN1
VIN
1
VIN
2
GND
3
GND
4
5
VBRITE
6
RM P _RST
7
PHA_SY NC
8
9 ENABLE
10 VDDSW
C1b
470nF 16V
10%
C2b
470nF 16V
10%
VDD
VBRITE
1
2
3
4
5
C3b 10nF
16V 10%
6
7
8
R1b
9
80.6K 1%
10
RMP_RST
P H A -S YN C
11
12
C5b: 220nF 16V 10%
C6b: 82nF 16V 10%
C7b: 100nF 16V 10%
C8b: 2.2nF 50V 5%
C9b: 4.7nF 16V 10%
C10-11b: 10nF 16V 10%
Slave 2
VDDP
AOU
T
VSS_P
VSS
BOU
T
VDD_P
VDD
BEPOL
B R IT E
CPOR
VDD_SW
T R I_
C
OLSNS
ENABLE
IS N S
I_R ICOMP
CPWM1 VCOMP
CPWM2
VSNS
RMP_RST SLAVE
FAUL
PHA_SYNC
T
24
23
R2b
47
22
VDDSW
21
C5b
20 C6b
19 C7b
18 C8b
17
C9b
16 C10b
15
C11b
14
13
R3b
220
VDD
C4b
220nF
16v 10%
VDDSW
LED1b
R13b
100K
Power
Output
Section
Figure 2- Schematic modules connected as a Master and Slaves
Copyright 2001
Rev. 1.1a, 2003-03-21
Microsemi
Integrated Products, Power Management
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet LX1688CPW.PDF ] | |
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