LX1688IPW MICROSEMI, LX1688IPW Datasheet

LX1688IPW

Manufacturer Part Number
LX1688IPW
Description
Manufacturer
MICROSEMI
Datasheet

Specifications of LX1688IPW

Driver Type
CCFL
Operating Supply Voltage (typ)
3.3/5V
Number Of Segments
2
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
Package Type
TSSOP
Pin Count
24
Mounting
Surface Mount
Operating Supply Voltage (min)
3V
Operating Supply Voltage (max)
5.5V
Lead Free Status / Rohs Status
Compliant
Copyright © 2001
Rev. 1.2, 2006-03-09
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
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 Microsemi’s patented
direct drive fixed frequency topology and
patented resonant lamp strike generation
technique.
IMPORTANT: For the most current data, consult MICROSEMI’s website:
Protected by U.S. Patents 5,615,093; 5,923,129; 5,930,121; 6,198,234; Patents Pending
The LX1688 is a fixed frequency, dual
CONNECTOR
INPUT
TM
FAULT 1
FAULT 2
without
DIMMING (BRITE)
ENABLE
requiring
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
ENABLE
MASTER
LX1688
LX1688
SLAVE
VDD
FAULT 2
Simplified Quad Lamp Inverter Showing Synchronized Output Waveforms
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1688CPW-TR)
-40 to 85
FAULT 1
0 to 70
T
BRITE
J
D E S C R I P T I O N
(°C)
external
dual feedback control loop that permits
regulation of maximum lamp strike voltage
as well as lamp current.
maximum lamp voltage permits the designer
to provide for ample worst-case lamp strike
voltage
maximum open circuit voltage. In addition
the
shutdown for an open or broken lamp, and a
lamp fault detection with a status reporting
output.
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.
power sleep mode with no additional
components.
STATUS
STRIKE
STATUS
STRIKE
M
3.0V
3.0V
Safety and reliability features include a
To improve design flexibility the IC
IN
P R O D U C T H I G H L I G H T
P A C K A G E O R D E R I N F O
V
controller
DD
Integrated Products Division
while
®
Microsemi
http://www.microsemi.com
M
This preserves the micro
5.5V
5.5V
AX
features
conservatively
RangeMAX™
V
DD
LAMPS
PW
RoHS compliant / Pb-free Transition DC: 0442
include
Multiple Lamp CCFL Controller
Regulating
limiting
Plastic TSSOP
24-Pin
P
auto
LX1688CPW
RODUCTION
LX1688IPW
125 Hz 5% Duty cycle Burst
65KHz run frequency
Ch3
10.0mV Ω
A P P L I C A T I O N S / B E N E F I T S
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
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
D
ATA
K E Y F E A T U R E S
Ch2
S
HEET
10.0mV Ω
M
100µs
LX1688
Page 1

Related parts for LX1688IPW

LX1688IPW Summary of contents

Page 1

... RoHS compliant / Pb-free Transition DC: 0442 3.0V 5.5V LX1688CPW 3.0V 5.5V LX1688IPW Microsemi Integrated Products Division LX1688 D S ATA HEET 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 ...

Page 2

... Pin Name B OUT VDD_P VDD VDDSW TRI_C to VDD and POR OLSNS ISNS ; for bias current I ICOMP , used for PWM VCOMP , used for PWM VSNS SLAVE FAULT Microsemi Integrated Products Division LX1688 RODUCTION ATA HEET OUT VSS_P 2 23 VSS 3 22 BEPOL 4 21 ...

Page 3

... OLSNS F O LAMP > 0.65V; VDD=5V OLSNS F LAMP > 0.65V DD LAMP_REG OLSNS V TH_OLSNS V H_OLSNS T GBNT ² D_OLSNS I_FAULT Microsemi Integrated Products Division LX1688 RODUCTION ATA HEET LX1688 Min Typ Max 3 5 (For A DD LX1688 Min Typ. Max 2.6 2.5 0.4 0.5 ...

Page 4

... ENABLE I DD_SLEEP ( float) BEPOL 0.8V ENABLE I DD_SLEEP ( BEPOL 2.5V ENABLE I DD_SLEEP ( BEPOL SS V Rising turn-on threshold TH_UVLO V Falling turn-off hysteresis H_UVLO Microsemi Integrated Products Division LX1688 D S ATA HEET LX1688 Units Min Typ. Max 10 ‘ 100 ‘mA 100 ‘mA 50 ‘mA 50 ‘mA 100 ‘ ...

Page 5

... Under Voltage Lockout Vs Temperature 2.9 2.85 2.8 2.75 2.7 2.65 2.6 2.55 2 -40 Power-on-Reset Pulse Width Vs Temperature VDD= - Microsemi Integrated Products Division LX1688 RODUCTION ATA HEET VDD=5.5V VDD=3V - Temperature (°C) Turn On Turn Off - Temperature (°C) - Temperature (° ...

Page 6

... PWR_ BD BIAS GEN PWR_GD UVLO PWR_BD INTERNAL VDD VSS VSS VDD I_R CPOR Figure – Simplified Block Diagram Microsemi Integrated Products Division LX1688 RODUCTION ATA HEET DIMMING POLARITY* CONVENTIONAL REVERSE REVERSE Pin: RMP_RST Pin: A_SYNC Frequency Output: F ...

Page 7

... The LX1688 is a backlight controller specifically designed with a special feature set needed in multiple lamp desktop monitors, and other multiple lamp displays. While utilizing the same architecture as Microsemi’s LX1686 controller it eliminates the synchronized digital dimming and adds, lamp ‘strike’ count out timer, lamp fault status ...

Page 8

... WITCHED & Formula 2: Lamp Frequency (A TRI [Hz] ) TRI Formula 4: Minimum Voltage Error Amp Bandwidth, B IEA_MIN [Hz] Formula 6: Minimum Power-on Reset Pulse Width, T [sec] VCOMP Microsemi Integrated Products Division LX1688 RODUCTION ATA HEET PHA_SYNC AND PIN TIMING REQUIREMENT M O ODE PERATION Min Typ Max ...

Page 9

... ISNS 16V 4.7nF ICOMP C10 16V 10% 16 10nF VCOMP 16V 10% C11 15 10nF VSNS 16V 10% 14 SLAVE 13 FAULT R3 220 LED1 OPTION Microsemi Integrated Products Division LX1688 RODUCTION ATA HEET C13 8 T1 CN2 0.1uF 50V 1: C14 2.2PF VDDP 1 PCB Q2 5 BC847ALT1 ...

Page 10

... The section follows with measurement waveforms and list of material of the actual modules. For more detail design procedure and circuit description please refer to application note (AN-13), which is available in Microsemi’s web site NPUT OLTAGE The LX1688 controller can operate at 3.3 to 5.0V ± ...

Page 11

... C11a 14 RMP_RST 13 PHA-SYNC R3a VDDSW 220 Slave 2 R13a LED1a 100K 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% Microsemi Integrated Products Division LX1688 RODUCTION ATA HEET VDD C4 220nF C5 16v 10% Power C7 Output C8 ...

Page 12

... Figure 5- OUT Figure 4- Output drivers of both Master and Slaves. CH2=A CH3=A CH4=A Microsemi Integrated Products Division LX1688 D S ATA HEET Master is in striking mode while slaves are in running mode CH2= A ...

Page 13

... Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 RangeMAX™ ® Multiple Lamp CCFL Controller P RODUCTION Figure 7- (Master), OUT (Slave2) OUT Microsemi Integrated Products Division LX1688 D S ATA HEET Gate signals during digital dimming with 5% duty cycle CH2= A (Master), OUT CH3=A ...

Page 14

... NOVACAP AVX AVX AVX NOVACAP 2.2pF PCB AVX NOVACAP Microsemi turns ratio 1:75 Molex Connector, 2 pin Molex Table 2 - List of material for LX1688 inverter module Microsemi Integrated Products Division LX1688 RODUCTION ATA HEET Part Number LX1688 Si9945AEY BC847ALT1 BAW56 BAV99 0805YC224MAT2A 0603YC823KAT2A ...

Page 15

... H – 1.10 – L 0.50 0.75 0.020 M 0° 8° 0° P 6.25 6.55 0.246 *LC – 0.10 – Microsemi Integrated Products Division LX1688 D S RODUCTION ATA HEET C M MAX 0.037 0.012 0.008 0.311 0.177 0.005 .0433 0.030 8° 0.258 0.004 Page 15 ...

Page 16

... TM PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright © ...

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