LX1686CPW Datasheet PDF - Microsemi Corporation
| Part Number | LX1686CPW | |
| Description | Digital Dimming CCFL Controller IC | |
| Manufacturers | Microsemi Corporation | |
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T H E I N F I N I T E P O W E R O F I N N O VAT I O N
RangeMAXTM
LX1686
DIGITAL DIMMING CCFL CONTROLLER IC
PRELIMINARY DATA SHEET
DESCRIPTION
The LX1686 Backlight Controller IC
provides all the control functions needed
to implement Linfinity’s direct drive in-
verters used to operate cold cathode fluo-
rescent lamps (CCFL’s). This IC can be
used to control single or multiple-lamp
configurations. CCFL’s are used for back
or edge lighting of liquid crystal flat panel
displays (LCD’s) and typically find appli-
cation in notebook computers, web
browsers, automotive and industrial in-
strumentation, and entertainment sys-
tems.
The LX1686 includes a PWM con-
trolled lamp current burst circuit that
can provide a >100:1 dimming range from
a simple zero to 2.5V potentiometer in-
put. The PWM dimming burst rate is
easily synchronized to the LCD panel’s
frame rate to prevent interference from
optical beat frequencies.
Safety and reliability features in-
clude a new dual feedback contol loop
that permits regulation of maximum lamp
strike voltage as well as lamp current.
Regulating maximum lamp voltage per-
mits the designer to provide for ample
worst case lamp strike voltage while at
the same time conservatively limit maxi-
mum open circuit voltage.
An innovative new strike voltage
generation technique enables the mod-
ule designer to optimize high voltage
transformer design for maximum oper-
ating efficiency with no power dissipat-
ing overhead to guarantee strike capa-
bility.
Direct drive topology is a non-reso-
nant, oscillator-controlled PWM regu-
lation method. The LX1686 allows a
wide choice of fixed operating frequen-
cies to match lamp current frequency to
the lamp’s most efficient operating point,
and to minimize high frequency interfer-
ence.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
KEY FEATURES
s RangeMAXTM Wide Range Dimming (>100:1)
s Synchronizable To Display Video Frequency
s High Voltage Feedback Loop Directly
Controls Maximum Open Lamp And
Minimum Strike Voltages
s Transformer Protected From Over-Heating
During Lamp Striking
s Micro-Amp Sleep Mode
s User-Programmable Fixed Frequency
Operation
s Under-Voltage Lockout Feature With Power-
Up Reset
s Built-In Soft-Start Feature
s Operates With 3.3V or 5V Power Supplies
s 100mA Output Drive Capability
A P P L I C AT I O N S
s Notebooks
s Instrumentation Displays
s Desktop Computer Monitors
s Low Ambient Light Displays (used in
Aircraft, Automobiles, and Hand-held
Equipment)
BENEFITS
s Extemely High Efficiency From 3.3V or 5V
Power Supplies
s Lower Cost Than Conventional Buck / Royer
Inverter Topologies
s Improved Lamp Strike Capability
s Improved Over-Voltage Control
PRODUCT HIGHLIGHT
RANGEMAX VS. ANALOG DIMMING
5
Standard Analog
Dimming Inverter
4
3
LinFinity's
RangeMAX
2
Light emitted by a CCFL is proportional to the current
flowing through it. There are two ways to control the
current: by adjusting the amplitude of a continuous AC
current; or, as with RangeMAX technology, by varying
the amount of time a burst of full current is present.
RangeMAX technology frees the backlight inverter
module designer to operate in a lower brightness and
lower power consumption mode than is possible with
conventional amplitude control methods.
1
0
Copyright © 2000
Rev. 0.4 1/00
30 45 60 75 90 105
Light Output (Nits)
PACKAGE ORDER INFO
TA (°C)
PW
Plastic
24-pin
TSSOP
0 to 85
LX1686CPW
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX1686CPWT)
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
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RangeMAXTM
PRODUCT DATABOOK 1996/1997
DIGITAL DIMMING CCFL CONTROLLER IC
PRELIMINARY DATA SHEET
LX1686
BLOCK DIAGRAM
P D _C R
C PDC
R PD
C PD
FVER T
A FD _C
C AFD
V C O _C
C VCO
B R IT E
P hase
D e te c to r
A u to
F re q .
D e te c t
VCO
2 .5 V
0V
0 .5 - 2 .5 V
B u rs t
C o m p a ra to r
50k
B R T_P O S
D IG _ D IM
E N A 50k
1 .5 V
0 -3 V
VDD VDD
D im m in g C o n tr o l
C VCOM P
B R T IS N S V S N S
C IC O M P
VCO M P
IC O M P
V o lta g e
E rro r
Am p
1 .2 5 V
VAM P
IA M P
PW M
C o n tr o lle r s
V o lta g e
C o m p a ra to r
O u tp u t
S te e r in g
L o g ic
VCO M P
IC O M P
Q
A
O u tp u t
D r iv e r s
C u rre n t
E rro r A m p
R A M P _C
C RAM P
0 .2 5 -2 .2 5 V
C u rre n t
C o m p a ra to r
QB
R A M P _C
T r ia n g le
W ave
G e n e ra to r
R A M P _D O U T
C LK
OUT
O pen Lam p
C o m p a ra to r
Ig n ite
B ia s G e n e r a to r ,
U V L O , a n d V REF
ENA
P W R _G D
2 .5 0 V
V D D _S W
300m V
255m V
PW M
R am p
G e n e ra to r
R A M P _R
R RAM P2
R RAM P1
VDD
T R I_ C
C TRI
O LSN S
V D D _P
AOUT
BOUT
V S S _P
VDD
EN A B LE
I_ R
Ri
VSS
FIGURE 1 — LX1686 Block Diagram
Copyright © 2000
Rev. 0.4 1/00
RangeMAX and is a trademark of Linfinity Microelectronics Inc.
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may
not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form
only, and Linfinity reserves the right to change or discontinue this proposed product at any time.
5
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