LX6512

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

High Performance CCFL Controller

TM

®

Copyright

© 2007

Rev. 1.3, 10/22/2009

DESCRIPTION

KEY FEA T URES

• 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

APPLICA T IONS

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 N-

FET drivers, providing a simple, low cost

inverter solution.

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

SOIC, TSSOP and 3x3 mm 16pin QFN.

• Note Book LCD displays

• Transportable Computers

• Web Tablet LCD displays

• Digital Picture Frame

• Monitor / TV Portable DVD Player

Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; 7,112,929; Patents Pending

U1

LX6512CLQ

GND

11

VDDA

15

VDDP

14

F_OSC

2

BRITE_D

1

EA_OUT

6

ENA

4

BOH

12

AOH

13

V_SNS

7

C_TO

5

B_OSC

3

VIN_SNS

16

ISNS

8

AOL

10

BOL

9

R7

1M

CN1

CON8

1

2

3

4

5

6

7

8

T1

U2

1

2

3

4

5

6

7

8

R1

61.9K

C12

2.2nF

C11

2pF PCB

C5

3.9nF

CN2

CON2

1

2

F1

FUSE

C2

100nF

R4

374 Ohm

C3

1uF

C13

100nF

C14

100pF

VDDA

VDDA

C6

0.1uF

R5

115K

C4

1uF

C9

10uF

PACKAGE ORDER INFO

THERMAL DATA

D

Plastic SOIC 16-pin

θ

J

LQ

Plastic 3x3 mm QFN 16-pin

θ

J

PW

Plastic TSSOP 16-pin

θ

J

RoHS Compliant / Pb-free

THERMAL RESISTANCE

-20 to 85

LX6512CD, LX6512CLQ or LX6512CPW

Note: Available in Tape & Reel. Append the letters “TR” to the part number.

(i.e. LX6512CD-TR)

The

θ

device/pc-board system. All of the above assume no ambient airflow.