Datasheet > MC34844EP/R2

MC34844EP/R2

更新时间： 2024-09-19 11:09:03

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		驱动器接口集成电路
页数	文件大小	规格书
37页	2140K
描述
10 Channel LED Backlight Driver with Integrated Power Supply

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

MC34844EP/R2 数据手册

Document Number: MC34844

Rev. 5.0, 5/2009

Freescale Semiconductor

Advance Information

10 Channel LED Backlight Driver

with Integrated Power Supply

34844

The 34844 is a high efficiency, LED driver for use in backlighting

LCD displays from 10" to 20"+. Operating from supplies of 7.0 to 28 V,

the MC34844 is capable of driving up to 160 LEDs in 10 parallel

strings. Current in the 10 strings is matched to within 2%, and can be

programmed via the I²C/SM Bus interface.

LED DRIVER

The 34844 also includes a Pulse Width Monitor (PWM) generator

for LED dimming. The LEDs can be dimmed to one of 256 levels,

programmed through the I²C/SM Bus interface. Up to 65,000:1 (256:1

PWM, 256:1 Current DAC) dimming ratio.

The integrated boost converter generates the minimum output

voltage required to keep all LEDs illuminated with the selected current,

providing the highest efficiency possible. The integrated boost self-

clocks at a default frequency of 600 kHz, but may be programmed via

I²C to 150/300/600/1200 kHz. The PWM frequency can be set from

100 Hz to 25 kHz, or can be synchronized to an external input. If not

synchronized to another source, the internal PWM rate outputs on the

CK pin. This enables multiple devices to be synchronized together.

EP SUFFIX (PB-FREE)

98ASA10800D

32-PIN QFN-EP

The 34844 also supports optical/temperature closed loop operation

and also features LED over-temperature protection, LED short

protection, and LED open circuit protection. The IC also includes over-

voltage protection, over-current protection, and under-voltage lockout.

ORDERING INFORMATION

Temperature

Package

Features

Device

Range (T )

• Input voltage of 7.0 to 28 V

MC34844EP/R2

-40°C to 105°C

32 QFN-EP

• Boost output voltage up to 60 V, with Dynamic

Headroom Control (DHC)

• 3.0 A integrated boost FET

Applications

• Up to 50 mA LED current per channel

• 90% efficiency (DC:DC)

• 10 channel current mirror with ±2% current matching

• I²C/SM Bus interface

• Monitors - up to 27 inch

• Personal Computer Notebooks

• GPS Screens

• Small screen Televisions

• PWM frequency programmable or synchronizable from

100 to 25,000Hz

• 32-Ld 5x5x1.0 mm TQFN Package

• Pb-free packaging designated by suffix code EP

34844

7.0 to 28V

VIN

SWA

SWB

VDC1

VDC2

VDC3

VOUT

PGNDA

PGNDB

COMP

VCC

SLOPE

FAIL

SCK

SDA

Control Unit

VDC1

PWM

A0/SEN

M/~S

ISET

VDC1

NIN

GND

Figure 1. Simplified Application Diagram (SM Bus Mode)

* This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

12 3 4 5 6 7...37

中文翻译

下载PDF

与MC34844EP/R2相关器件

型号	品牌	获取价格	描述	数据表
MC34845	FREESCALE	获取价格	Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply
MC34845AEP/R2	FREESCALE	获取价格	Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply
MC34845BEP	NXP	获取价格	LED DISPLAY DRIVER, QCC24, 4 X 4 MM, 0.65 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, QFN-24
MC34845BEP/R2	FREESCALE	获取价格	Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply
MC34845BEPR2	NXP	获取价格	LED DISPLAY DRIVER, QCC24, 4 X 4 MM, 0.65 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, QFN-24
MC34845CEP	NXP	获取价格	LED Backlight Driver, 6 Channel with Integrated Power Supply,QFN 24, Tray
MC34845CEPR2	NXP	获取价格	LED Backlight Driver, 6 Channel with Integrated Power Supply,QFN 24, Reel
MC34845DEPR2	NXP	获取价格	LED Backlight Driver, 6 Channel with Integrated Power Supply,QFN 24, Reel
MC34845EP	NXP	获取价格	LED DISPLAY DRIVER, QCC24, 4 X 4 MM, 0.65 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, QFN-24
MC34845EP/R2	FREESCALE	获取价格	Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply

与MC34844EP/R2相关文章

摩尔斯微电子在美国约书亚树国家公园测试 Wi-Fi HaLow
2024-09-18

29
贸泽上架Tallysman TW5386智能GNSS天线
2024-09-18

28
SL74HC10N：高性能三输入与非门解析
2024-09-03

100
AIC1781A 电池充电控制器深度解析
2024-09-03

94

产品中心

服务支持

精选活动

关于我们

帮助中心

MC34844EP/R2

MC34844EP/R2 数据手册

与MC34844EP/R2相关器件

与MC34844EP/R2相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

MC34844EP/R2

MC34844EP/R2 数据手册

与MC34844EP/R2相关器件

与MC34844EP/R2相关文章

您还可以找

您在本页遇到什么问题？