MAX8751 Maxim Integrated Products, MAX8751 Datasheet

MAX8751

Manufacturer Part Number

MAX8751

Description

Full-Bridge CCFL Inverter Controller

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8751.pdf (27 pages)

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The MAX8751 cold-cathode-fluorescent lamp (CCFL)

inverter controller is designed to drive multiple CCFLs

using the fixed-frequency, full-bridge inverter topology.

The MAX8751 operates in resonant mode during striking

and switches over to constant-frequency operation after

all the lamps are lit. This unique feature ensures reliable

striking under all conditions and reduces the transformer

stress.

The MAX8751 can drive large power MOSFETs typically

used in applications where one power stage drives four

or more CCFL lamps in parallel. An internal 5.35V linear

regulator powers the MOSFET drivers and most of the

internal circuitry. The controller operates over a wide

input-voltage range (6V to 28V) with high power to light

efficiency. The device also includes safety features that

effectively protect against many single-point fault condi-

tions, including lamp-out and short-circuit conditions.

The MAX8751 achieves a 10:1 dimming range by “chop-

ping” the lamp current on and off using the digital pulse-

width modulation (DPWM) method. The DPWM frequency

can be accurately adjusted with a resistor or synchro-

nized to an external signal. The brightness is controlled

by an analog voltage on the CNTL pin.

The MAX8751 is capable of synchronizing and adjusting

the phase of the gate drivers and DPWM oscillator. These

features allow multiple MAX8751 ICs to be connected in a

daisy-chain configuration. The switching frequency and

DPWM frequency can be easily adjusted using external

resistors, or synchronized with system signals. If the con-

troller loses the external sync signals, it switches over to

the internal oscillators and keeps operating. Phase-shift

select pins PS1 and PS2 can be used to program up to

four different phase shifts, allowing up to five MAX8751s

to be used together.

The MAX8751 is available in a low-profile, 32-pin TQFN

package and operates over the -40°C to +85°C tempera-

ture range.

19-3784; Rev 0; 8/05

Pin Configuration appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX8751ETJ

LCD TVs

LCD Monitors

PART

________________________________________________________________ Maxim Integrated Products

Ordering Information

-40°C to +85°C

TEMP RANGE

General Description

Notebook Computers

Automotive Infotainment

Fixed-Frequency, Full-Bridge CCFL

Applications

PIN-PACKAGE

32 TQFN

♦ All n-Type MOSFET Low-Cost, Full-Bridge,

♦ Resonant-Mode Striking Ensures Startup

♦ Strong Gate Drivers Can Easily Drive Large

♦ Adjustable DPWM Frequency with Sync and

♦ 10:1 Dimming Range with Accurate Analog

♦ Lamp-Out Detection with Adjustable Timeout

♦ Secondary Current Limit with Adjustable Timeout

♦ Adjustable Secondary Voltage Limiting

♦ Adjustable DPWM Rise and Fall Time

♦ Wide Input Voltage Range (6V to 28V)

♦ 32-Pin TQFN Package

7V TO 24V

GND

VIN

Fixed-Frequency Inverter Topology for Highest

Efficiency

External MOSFETs for Multilamp Applications

Phase-Shift Capability

Interface

BRIGHTNESS

ON/OFF

Inverter Controller

Minimal Operating Circuit

HFCK

GND

SEL

SHDN

CNTL

PCOMP

HSYNC

LSYNC

LFCK

DPWM

PSCK

PS1

PS2

MAX8751

PGND1

PGND2

COMP

BST1

BST2

ISEC

TFLT

GH1

GL1

GL2

GH2

VFB

LX1

LX2

IFB

Features

CCFL

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