MAX8751ETJ+T datasheet, PDF - EEWORLD Datasheet

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MAX8751ETJ+T: DescriptionDisplay Drivers & Controllers Fixed-f Full-Bridge CCFL Controller; CategoryAnalog mixed-signal IC The signal circuit; File Size1MB，26 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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MAX8751ETJ+T Overview

Display Drivers & Controllers Fixed-f Full-Bridge CCFL Controller

MAX8751ETJ+T Parametric

Parameter Name	Attribute value
Is it lead-free?	Lead free
Is it Rohs certified?	conform to
Maker	Maxim
Parts packaging code	QFN
package instruction	HVQCCN,
Contacts	32
Reach Compliance Code	compliant
ECCN code	EAR99
Is Samacsys	N
Analog Integrated Circuits - Other Types	ANALOG CIRCUIT
JESD-30 code	S-XQCC-N32
JESD-609 code	e3
length	5 mm
Number of functions	1
Number of terminals	32
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	UNSPECIFIED
encapsulated code	HVQCCN
Package shape	SQUARE
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Maximum seat height	0.8 mm
Maximum supply voltage (Vsup)	28 V
Minimum supply voltage (Vsup)	6 V
Nominal supply voltage (Vsup)	24 V
surface mount	YES
technology	BICMOS
Temperature level	INDUSTRIAL
Terminal surface	MATTE TIN
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	NOT SPECIFIED
width	5 mm
Base Number Matches	1

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EVALUATION KIT AVAILABLE

MAX8751

Fixed-Frequency, Full-Bridge CCFL

Inverter Controller

General Description

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 synchronized

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 fea-

tures 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 controller loses the

external sync signals, it switches over to the internal oscilla-

tors 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.

Features

● All n-Type MOSFET Low-Cost, Full-Bridge, Fixed-

Frequency Inverter Topology for Highest Efficiency

● Resonant-Mode Striking Ensures Startup

● Strong Gate Drivers Can Easily Drive Large External

MOSFETs for Multilamp Applications

● Adjustable DPWM Frequency with Sync and Phase-

Shift Capability

● 10:1 Dimming Range with Accurate Analog Interface

● 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

Minimal Operating Circuit

VIN

7V TO 24V

GND

MAX8751

SEL

GH1

BST1

ON/OFF

BRIGHTNESS

SHDN

CNTL

PCOMP

LX1

LX2

BST2

GL1

PGND1

PGND2

GL2

HFCK

HSYNC

LSYNC

LFCK

VFB

GH2

ISEC

CCFL

Applications

● LCD TVs

● LCD Monitors

● Notebook Computers

DPWM

IFB

PSCK

PS1

PS2

COMP

TFLT

Ordering Information

PART

MAX8751ETJ

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

32 TQFN

Pin Configuration appears at end of data sheet.

19-3784; Rev 1; 5/14

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