Microsemi LX6512 High performance ccfl controller Datasheet

LX6512
High Performance CCFL controller
®
TM
P RODUCTION D ATA S HEET
DESCRIPTION
The LX6512 contains safety features
that limit the transformer secondary
voltage and protect against fault conditions
which include open lamp, broken lamp
and short-circuit faults. The over voltage
fault shutdown is disabled during a user
programmable interval to allow lamp
strike.
The controller can accept a brightness
control signal that is either an analog
voltage level, or a direct low frequency
PWM. Utilizing this signal it provides
CCFL brightness dimming control using
digital dimming, to achieve a wide
dimming range (> 60 to 1).
An integrated 4V LDO (Low Dropout
Regulator) powers all internal control
circuitry and up to 5mA for external
circuitry greatly simplifying supply
voltage requirements.
The LX6512 is available in a 16-Pin
TSSOP and 3x3 mm 16pin QFN.
• Full Bridge or Direct Drive Push
Pull Configurable
• Patented Striking Topology
• Low Stress to Transformers
• Wide Dimming Range
• Programmable Operating
Dimming Frequency
• Programmable Time Out
Protection
• Fixed Operating Frequency
• Open Lamp Voltage Protection,
Short Lamp Protection, Over
Voltage Protection
• Compatible with Existing
Transformers
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Microsemi’s LX6512 is a cost effective,
Direct Drive CCFL (Cold Cathode
Fluorescent Lamp) controller. The
integrated controller is optimized to drive
CCFL’s (Cold Cathode Fluorescent
Lamps) using either resonant full bridge
inverter topology or push-pull Direct
Drive configurations.
Resonant full bridge topology provides
near sinusoidal waveforms over a wide
supply voltage range in order to maximize
the life of CCFL lamps, control EMI
emissions, and maximize efficiency. This
new architecture is also coupled with a
wide dimming range capability.
For fixed input supply applications the
LX6512 uses Direct Drive topology to
supply fixed frequency PWM signals
connected directly to the high voltage
transformer primary via a single pair of NFET drivers, providing a simple, low cost
inverter solution.
KEY FEATURES
APPLICATIONS
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•
•
•
•
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Note Book LCD displays
Transportable Computers
Web Tablet LCD displays
Digital Picture Frame
Monitor / TV
Portable DVD Player
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; 7,112,929; Patents Pending
FUSE
F1
CN1
1
2
3
4
5
6
7
8
C9
10uF
VDDA
R5
115K
CON8
R1
61.9K
R7
1M
U2
1
C14
100pF
2
C2
100nF
3
BRITE_D
VIN_SNS
F_OSC
VDDA
B_OSC
VDDP
16
4
5
T1
VDDA
15
C6
0.1uF
3
6
14
C4
1uF
2
7
C13
100nF
C11
CN2
1
2
CON2
2pF PCB
4
C3
1uF
5
C5
3.9nF
6
7
8
ENA
U1
LX6512
AOH
C_TO
BOH
EA_OUT
GND
V_SNS
AOL
ISNS
BOL
1
13
8
C12
12
2.2nF
11
10
9
R4
374 Ohm
LX6512
LOW COMPONENT COUNT REQUIREMENT FOR TOTAL SYSTEM SOLUTION
PACKAGE ORDER INFO
TA (°C)
LQ
PW
-20 to 70
THERMAL DATA
Plastic 3x3 mm QFN 16-pin
Plastic TSSOP 16-pin
θJA = 99 °C/W
RoHS Compliant / Pb-free
THERMAL RESISTANCE-JUNCTION TO AMBIENT
LX6512CLQ or LX6512CPW
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the
device/pc-board system. All of the above assume no ambient airflow.
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX6512CLQ-TR)
Copyright © 2007
Rev. 1.0, 2007-12-21
θJA = 33.3°C/W
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
TM
®
Thank you for your interest in Microsemi® Analog Mixed Signal products.
The full data sheet for this device contains proprietary information.
To obtain a copy, please contact your local Microsemi sales representative. The
name of your local representative can be obtained at the following link
http://www.microsemi.com/contact/contactfind.asp
or
Contact us directly by sending an email to:
[email protected]
Be sure to specify the data sheet you are requesting and include your company
name and contact information and or vcard.
We look forward to hearing from you.
Copyright
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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INFORMATION
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