LX6512 Datasheet, PDF (1/2 Pages) Microsemi Corporation – High Performance CCFL controller

LX6512
TM
®
High Performance CCFL controller
PRODUCTION DATA SHEET
DESCRIPTION
Microsemi’s LX6512 is a cost effective, The LX6512 contains safety features
Direct Drive CCFL (Cold Cathode that limit the transformer secondary
Fluorescent Lamp) controller. The voltage and protect against fault conditions
integrated controller is optimized to drive which include open lamp, broken lamp
CCFL’s (Cold Cathode Fluorescent and short-circuit faults. The over voltage
Lamps) using either resonant full bridge fault shutdown is disabled during a user
inverter topology or push-pull Direct programmable interval to allow lamp
Drive configurations.
strike.
Resonant full bridge topology provides The controller can accept a brightness
near sinusoidal waveforms over a wide control signal that is either an analog
supply voltage range in order to maximize voltage level, or a direct low frequency
the life of CCFL lamps, control EMI PWM. Utilizing this signal it provides
emissions, and maximize efficiency. This CCFL brightness dimming control using
new architecture is also coupled with a digital dimming, to achieve a wide
wide dimming range capability.
dimming range (> 60 to 1).
For fixed input supply applications the An integrated 4V LDO (Low Dropout
LX6512 uses Direct Drive topology to Regulator) powers all internal control
supply fixed frequency PWM signals circuitry and up to 5mA for external
connected directly to the high voltage circuitry greatly simplifying supply
transformer primary via a single pair of N- voltage requirements.
FET drivers, providing a simple, low cost The LX6512 is available in a 16-Pin
inverter solution.
TSSOP and 3x3 mm 16pin QFN.
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
CN1
1
2
3
4
5
6
7
8
CON8
FUSE
F1
R5
115K
VDDA
R1
R7
61.9K 1M
C9
10uF
U2
C14 100pF
C2 100nF
C3
1uF
C5
3.9nF
1
BRITE_D
16
VIN_SNS
2
F_OSC
15
VDDA
3 _{B_OSC}
VDDP ¹⁴
4 _ENA
U1
LX6512
5
C_TO
AOH ¹³
12
BOH
6 _{EA_OUT}
GND ¹¹
7 _{V_SNS}
AOL ¹⁰
8 _ISNS
BOL ⁹
VDDA
C6
0.1uF
C4 1uF
4
5
T1
3
6
2
7
1
8
KEY FEATURES
• 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
APPLICATIONS
• Note Book LCD displays
• Transportable Computers
• Web Tablet LCD displays
• Digital Picture Frame
• Monitor / TV
• Portable DVD Player
C13 100nF
C11
2pF PCB
C12
2.2nF
CN2
1
2
CON2
R4
374 Ohm
LOW COMPONENT COUNT REQUIREMENT FOR TOTAL SYSTEM SOLUTION
T_A (°C)
PACKAGE ORDER INFO
LQ
Plastic 3x3 mm QFN 16-pin
PW
Plastic TSSOP 16-pin
RoHS Compliant / Pb-free
-20 to 70
LX6512CLQ or LX6512CPW
Note: Available in Tape & Reel. Append the letters “TR” to the part number.
(i.e. LX6512CLQ-TR)
THERMAL DATA
θ_JA = 33.3°C/W
θ_JA = 99 °C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT
Junction Temperature Calculation: T_J = T_A + (P_D x θ_JA).
The θ_JA numbers are guidelines for the thermal performance of the
device/pc-board system. All of the above assume no ambient airflow.
Copyright © 2007
Rev. 1.0, 2007-12-21
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
Page 1