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MP1038

Full Bridge CCFL Controller

Monolithic Power Systems 

TM

The Future of Analog IC Technology TM

MP1038

Full Bridge

CCFL Controller

DESCRIPTION

The MP1038 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 one or more cold

cathode fluorescent lamps (CCFL) 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 CCFL.

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. The built-in burst oscillator

can be synchronized with an external clock to

minimize display scan interference. Burst mode or

analog mode dimming is 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. Built-in

current limits for the external switches protect

against inadvertent shorts. The MP1038 is available

in TSSOP28 and SOIC28 packages.

TYPICAL APPLICATION

FEATURES

• Controls Four External, Low Cost, N-Channel

MOSFETs

• Fixed Operating Frequency

• Input Voltage Range of 10V to 32V

• 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

• Flat Panel Video Displays

• LCD TVs and Monitors

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

Power Systems, Inc.

The MP1038 is covered by US Patents 6,683,422, 6,316,881, and 6,114,814.

Other Patents Pending.

DBRT

ABRT

ENSYNC

LOK

1

SI

28

PGL

2

LI

27

LGL

3

LV

26

VCCL

4

COMP

25

OUTL

5

AG

24

UGL

6

FT

23

BTL

7

LCS

22

PRL

8

LCC

21

PGR

9

BRC

20

LGR

10

BRS

19

VCCR

11

DBRT

18

OUTR

12

ABRT

17

UGR

13

16

ENSYNC BTR

14

LOK

15

PRR

GND

VPS

MP1038_TA01

MP1038 Rev. 1.9w

www.MonolithicPower.com

1

12/20/2005

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2005 MPS. All Rights Reserved.

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