LX6512A Datasheet, PDF (1/2 Pages) Microsemi Corporation – High Performance CCFL Controller

LX6512A
TM
®
High Performance CCFL Controller
PRODUCT BRIEF
DESCRIPTION
KEY FEATURES
Microsemi’s LX6512A is a cost The LX6512A contains safety features
effective, high performance Direct Drive that limit the transformer secondary
CCFL (Cold Cathode Fluorescent Lamp) voltage and protect against fault conditions
controller. The integrated controller is including open lamp or broken lamp, over
optimized to drive CCFL’s (Cold Cathode voltage, arcing, and short-circuit fault. In
Fluorescent Lamps) using either resonant addition, a programmable strike time out
full bridge inverter topology or push-pull allows the user to set suitable strike time
configuration.
for a successful lamp strike for different
Resonant full bridge topology provides applications.
soft switching performance that helps to The controller also provides convenient
achieve near sinusoidal waveforms over a means for lamp brightness control. With
wide input voltage range, maximize the the programmable dimming frequency
life of CCFL lamps, lower switching noise oscillator, it allows to use an analog DC
and EMI emissions, and maximize the input to perform a digital dimming at the
inverter operating efficiency. This programmed frequency. Alternatively, an
architecture is also coupled with a quiet external PWM signal can also be applied
operation over wide dimming range.
to the dimming control pin to achieve a
For narrow range input applications the direct digital dimming control.
drive signal format of LX6512A allows An integrated 4V LDO (Low Dropout
the user to configure a push-pull circuit. Regulator) supplies all the internal control
Only a single pair of N-FET is needed to circuit and up to 5mA to the external
be driven by the signals from LX6512A circuitry to minimize the external voltage
directly and thus providing a simple, low supply requirement.
cost inverter solution.
The LX6512A is available in a 16-Pin
SOIC package.
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
 Full Bridge or Direct Drive Push
Pull Configurable
 Patented Striking Technology
 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
Transformer Designs
APPLICATIONS
 Note Book LCD displays
 Transportable Computers
 Web Tablet LCD displays
 Digital Picture Frame
 Monitor / TV applications
 Portable DVD Player
CN1
1
2
3
4
5
6
7
8
FUSE
F1
VDDA
R5
115K
C6 0.1uF
R1 R7
61.9K 1M
1 _VDDA
U1
VDDP ¹⁶
2 _{VIN_SNS}
AOH ¹⁵
C14 100pF
C2 100nF
3
BR I TE_D
14
BOH
4 _{F_OSC}
GND ¹³
LX6512A
5
12
B_OSC
AOL
6
EN A
11
BOL
C3 1uF
7 _{C_TO}
ISNS ¹⁰
C5 3.9nF
8 _{EA_OUT}
V_SNS ⁹
C4 1uF
U2
4
5
3
6
2
7
1
8
C9
10uF
T1
C13
R8
10M
100nF
CN2
1
2
R9
10K
R4
374 Ohm
LOW COMPONENT COUNT REQUIREMENT FOR TOTAL SYSTEM SOLUTION
PACKAGE ORDER INFO
THERMAL DATA
T_A (C)
D
Plastic SOIC 16-pin
RoHS Compliant / Pb-free
-20 to 85
LX6512ACD
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX6512ACD-TR)
_JA = 82.2 C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT
Junction Temperature Calculation: TJ = TA + (PD x JA).
The JA numbers are guidelines for the thermal performance of the
device/pc-board system. All of the above assume no ambient airflow.
Copyright  2010
Rev. 1.0, 7/2/2010
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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