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Microsemi Corporation - MULTIPLE LAMP CCFL CONTROLLER

Numéro de référence LX1688CPW
Description MULTIPLE LAMP CCFL CONTROLLER
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX1688CPW fiche technique
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
ƒ Provision to synchronize lamp
current & frequency with other
controllers
ƒ Dimming with analog or digital
(PWM) methods (>20:1)
ƒ Programmable Fixed frequency
ƒ Adjustable Power-up reset
ƒ ENABLE/BRITE Polarity Selection
ƒ Voltage limiting on step-up
transformer secondary winding
ƒ Open lamp timeout circuitry
ƒ Switched VDD output (10mA)
ƒ Micro-Amp Sleep Mode
ƒ Operates with 3.3V to 5V Supply
ƒ 100mA output drive capability
APPLICATIONS/BENEFITS
ƒ Desktop LCD Monitors
ƒ Multiple lamp panels
ƒ Low Ambient Light Displays
ƒ High Efficiency
ƒ Lower Cost than Conventional
Buck/Royer Inverter Topologies
ƒ Improved Lamp Strike Capability
ƒ 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
Ch2 10.0mV 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
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