MAX8709B

更新时间： 2024-11-05 03:14:59

品牌	Logo	应用领域
美信 - MAXIM		控制器
页数	文件大小	规格书
24页	990K
描述
High-Efficiency CCFL Backlight Controller with SMBus Interface

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数据手册

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MAX8709B 数据手册

19-0768; Rev 0; 3/07

High-Efficiency CCFL Backlight

Controller with SMBus Interface

General Description

Features

♦ Synchronized to Resonant Frequency

The MAX8709B integrated backlight controller is

optimized to drive cold-cathode fluorescent lamps

(CCFLs) using a resonant full-bridge inverter architecture.

The resonant operation maximizes striking capability and

provides near-sinusoidal waveforms over the entire input

range to improve CCFL lifetime. The controller operates

over a wide input voltage range of 4.6V to 28V with high

power-to-light efficiency. The device also includes safety

features that effectively protect against many single-point

fault conditions including lamp-out and short-circuit faults.

Longer Lamp Life

Guaranteed Striking Capability

High Power-to-Light Efficiency

♦ Wide Input Voltage Range (4.6V to 28V)

♦ Feed Forward for Excellent Line Rejection

♦ SMBus Dimming Control Interface

♦ 10:1 Dimming Range

The MAX8709B achieves 10:1 dimming range by “chop-

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

width-modulation (DPWM) method. The minimum DPWM

duty cycle of the MAX8709B is 12.5%. The brightness is

controlled with a 2-wire SMBus™-compatible interface.

The device directly drives the four external N-channel

power MOSFETs of the full-bridge inverter. An internal

5.3V linear regulator powers the MOSFET drivers, the

DPWM oscillator, and most of the internal circuitry. The

MAX8709B is available in a space-saving 28-pin

thin QFN package and operates over a -40°C to +85°C

temperature range.

♦ Guaranteed 200Hz to 220Hz DPWM Frequency

♦ Secondary Voltage Limit Reduces Transformer

Stress

♦ Adjustable Lamp-Out Protection with 1s Timer

♦ Secondary Current Limit Protects Against High-

Voltage Short Circuits to Ground

♦ Small, 5mm x 5mm, Thin QFN Package

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

Applications

MAX8709BETI

-40°C to +85°C 28 Thin QFN 5mm x 5mm

Notebook Computer Displays

LCD Monitors

LCD TVs

Automotive Displays

Pin Configuration appears at end of data sheet.

SMBus is a trademark of Intel Corp.

Minimal Operating Circuit

BATT

GND

BST2

BST1

GH1

LOT

REF

MAX8709B

LX1

LX2

GL1

ILIM

CCV

CCI

PGND

GL2

GH2

VFB

SUS

SDA

SCL

ISEC

IFB

________________________________________________________________ Maxim Integrated Products

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.

12 3 4 5 6 7...24

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与MAX8709B相关器件

型号	品牌	获取价格	描述	数据表
MAX8709BETI	MAXIM	获取价格	High-Efficiency CCFL Backlight Controller with SMBus Interface
MAX8709BETI+	MAXIM	获取价格	Fluorescent Light Controller, 0.5A, BICMOS, 5 X 5 MM, 0.80 MM, TQFN-28
MAX8709BETI+T	MAXIM	获取价格	Fluorescent Light Controller, 0.5A, BICMOS, 5 X 5 MM, 0.80 MM, TQFN-28
MAX8709ETI	ROCHESTER	获取价格	VACUUM FLUOR DISPLAY DRIVER, QCC28, 5 X 5 MM, 0.80 MM HEIGHT, MO220WHHD-1, TQFN-28
MAX8709ETI	MAXIM	获取价格	Vacuum Fluorescent Driver, 1-Segment, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, MO220WHHD-1, TQFN-
MAX8709ETI+	MAXIM	获取价格	Vacuum Fluorescent Driver, 1-Segment, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, MO220WHHD, TQFN-28
MAX870C	MAXIM	获取价格	Switched-Capacitor Voltage Inverters
MAX870C/D	MAXIM	获取价格	Switched-Capacitor Voltage Inverters
MAX870D	MAXIM	获取价格	Switched-Capacitor Voltage Inverters
MAX870EUK	MAXIM	获取价格	Switched-Capacitor Voltage Inverters

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