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LX1688CPW 반도체 회로 부품 판매점

MULTIPLE LAMP CCFL CONTROLLER



Microsemi Corporation 로고
Microsemi Corporation
LX1688CPW 데이터시트, 핀배열, 회로
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
Page 1


LX1688CPW 데이터시트, 핀배열, 회로
RangeMAX™
LX1688
INTEGRATED PRODUCTS
MULTIPLE LAMP CCFL CONTROLLER
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD_P, VDD) ....................................................................... 6.5V
Digital Inputs ..............................................................................-0.3V to VDD +0.5V
Analog Inputs ............................................................................–0.1V to VDD +0.5V
Digital Outputs .......................................................................... -0.3V to VDD +0.5V
Analog Outputs ......................................................................... -0.1V to VDD +0.5V
Operating Junction Temperature ..................................................................125°C
Storage Temperature ....................................................................................150°C
Lead Temperature (Soldering, 10 Seconds) .................................................300°C
Note 1: Exceeding these ratings could cause damage to the device. All voltages are with
respect to Ground. Currents are positive into, negative out of the specified terminal.
THERMAL DATA
PW Plastic TSSOP 24-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
100°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJC).
The θJA numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
PACKAGE PIN OUT
AOUT
VSS_P
VSS
BEPOL
BRITE
CPOR
ENABLE
I_R
CPWM1
CPWM2
RMP_RST
PHA_SYNC
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 16
10 15
11 14
12 13
PWPACKAGE
(Top View)
VBDOUDT_P
VDD
VDDSW
TRI_C
OLSNS
ISNS
ICOMP
VCOMP
VSNS
SLAVE
FAULT
Pin Name
AOUT
VSS_P
VSS
BEPOL
BRITE
CPOR
ENABLE
I_R
CPWM1
CPWM2
RMP_RST
PHA_SYNC
FUNCTIONAL PIN DESCRIPTION
Description
Pin Name
Description
Output Driver A
Connects to dedicated GND for Aout and
Bout Drivers
Connects to analog GND
Tri-mode input pin to control the polarity of
the ENABLE and BRITE signal
Analog/PWM input for brightness control
Connects an external capacitor CPOR to
VDD and is used for setting power-up reset
pulse width.
Used to enable or disable the chip
Connects to external resistor RI; for bias
current setting for internal oscillator
Connects to external capacitor CPWM, used
for integrating an external digital PWM
signal for analog dimming
BOUT
VDD_P
VDD
VDDSW
TRI_C
OLSNS
ISNS
ICOMP
VCOMP
Output Driver B
Connects to dedicated VDD for Aout and
Bout Drivers
Connects to analog VDD
Switchable VDD output controlled by
ENABLE
Connects to external capacitor CTRI
Analog input to detect open-lamp condition
Analog input from lamp current, has built-in
300mv offset
Current error Amp’s output; connects to
external capacitor CICOMP
Voltage error Amp’s output; connects to
external capacitor CVCOMP, can be used for
soft-start
Connects to external capacitor CPWM, used
for integrating an external digital PWM
signal for analog dimming.
VSNS
Analog input from transformer output
voltage
If SLAVE = “0”, RMP_RST is a CMOS
output; if SLAVE = “1”, it is a CMOS input
that locks the ramp oscillation frequency to
the master clock
If SLAVE= “0”, PHA_SYNC is a CMOS
output; if SLAVE = “1”, it is a CMOS input
that make the AOUT/BOUT phase
synchronous with the master
SLAVE
FAULT
Input control pin for setting the IC either in
Master or Slave mode; “1” for slave mode
and “0” for master mode.
Digital output to indicate maximum number
of lamp striking attempts has occurred
without lamp ignition.
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 2




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LX1688CPW controller

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LX1688CPW

MULTIPLE LAMP CCFL CONTROLLER - Microsemi Corporation