MAX8709

更新时间： 2024-10-31 23:51:59

品牌	Logo	应用领域
美信 - MAXIM		控制器
页数	文件大小	规格书
23页	525K
描述
High-Efficiency CCFL Backlight Controller with SMBus Interface

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数据手册

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MAX8709 数据手册

19-3177; Rev 0; 1/04

High-Efficiency CCFL Backlight

Controller with SMBus Interface

General Description

Features

♦ Synchronized to Resonant Frequency

The MAX8709 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 fea-

tures 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 MAX8709 achieves 10:1 dimming range by “chop-

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

width-modulation (DPWM) method. 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

MAX8709 is available in a space-saving 28-pin thin QFN

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

erature 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

Applications

PART

TEMP RANGE PIN-PACKAGE

Notebook Computer Displays

LCD Monitors

LCD TVs

MAX8709ETI

-40°C to +85°C 28 Thin QFN 5mm x 5mm

Automotive Displays

Pin Configuration appears at end of data sheet.

SMBus is a trademark of Intel Corp.

Minimal Operating Circuit

BATT

GND

BST2

LOT

REF

BST1

GH1

MAX8709

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...23

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与MAX8709相关器件

型号	品牌	获取价格	描述	数据表
MAX8709AETI	MAXIM	获取价格	Vacuum Fluorescent Driver, 1-Segment, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, MO220WHHD-1, TQFN-
MAX8709AETI+T	MAXIM	获取价格	Vacuum Fluorescent Driver, 1-Segment, BICMOS, 5 X 5 MM, 0.80 MM HEIGHT, MO220WHHD-1, TQFN-
MAX8709B	MAXIM	获取价格	High-Efficiency CCFL Backlight Controller with SMBus Interface
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

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