MP1048

Full Bridge

CCFL Controller

MP1048 Rev. 0.9

www.MonolithicPower.com

1

9/24/2007

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2007 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP1048 is a fixed operating frequency

inverter controller that controls four external

N-Channel power MOSFETs in a full-bridge

configuration. The inverter is designed to power

up to 6 cold cathode fluorescent lamps (CCFLs)

to backlight liquid crystal displays. Its full-bridge

architecture converts unregulated DC input

voltages to the nearly pure sine waves required

to ignite and operate CCFLs.

For reliable lamp ignition, the operating

frequency is set by an external resistor and

during startup is temporarily swept toward the

unloaded resonant frequency of the tank. Burst

mode or analog mode dimming are controlled

with an external analog signal. Built-in fault

management features include an open lamp

regulator, a transformer secondary peak current

regulator and a dual-mode fault timer. The

secondary

over-current

timeout

can

be

shortened with external components. The

MP1048 is available in TSSOP28 and SOIC28

packages.

FEATURES

• Capable of Driving up to 6 Lamps

• Controls Four External, Low Cost, N-Channel

MOSFETs

• Fixed Operating Frequency

• Input Voltage Range of 10V to 22V

• Lamp Current and Voltage Regulation

• Full-Wave Sense Amp

• Analog and Burst Mode Dimming Control

• Integrated Burst Mode Oscillator and Modulator

• Soft-On and Soft-Off Burst Envelope

• Open Lamp Protection

• Secondary Over-Current Protection

• Dual-Mode Fault Timer

• Available in TSSOP28 and SOIC28 Packages

APPLICATIONS

• Desktop LCD Flat Panel Displays

• Monitors

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

The MP1048 is covered by US Patents 6,683,422, 6,316,881, and 6,114,814.

Other Patents Pending.

TYPICAL APPLICATION

SI

LI

LV

COMP

AG

FT

LCS

LCC

BRC

BRS

DBRT

ABRT

EN

NC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

PGL

LGL

VCCL

OUTL

UGL

BTL

PRL

PGR

LGR

VCCR

OUTR

UGR

BTR

PRR

GND

VPS

DBRT

ABRT

EN