Datasheet > MC34844EP

MC34844EP

更新时间： 2024-11-08 12:56:31

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
62页	2431K
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 数据手册

Document Number: MC34844

Rev. 9.0, 3/2012

Freescale Semiconductor

Advance Information

10 Channel LED Backlight Driver

with Integrated Power Supply

34844

34844A

The 34844/A 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/A 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/A 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 34844 has an 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 34844A has a default boost frequency of 320 kHz, but may be

programmed via I²C to 160/320/650/1300 kHz. The PWM frequency

can be set from 110 Hz to 27 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.

ORDERING INFORMATION

Temperature

Package

Device

Range (T )

The 34844/A 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.

MC34844EP/R2

MC34844AEP/R2

-40 °C to 105 °C

32 QFN-EP

Features

• Input voltage of 7.0 to 28 V

• 2.5 A integrated boost FET

• Up to 50 mA on the 34844 LED current per channel

• Up to 80 mA on the 34844A LED current per channel

• 90% efficiency (DC:DC)

• I²C/SM Bus interface

• 10 channel current mirror with ±2% current matching

• Boost output voltage up to 60V, with Dynamic Headroom Control (DHC)

• PWM frequency programmable or synchronizable from 100 to 25,000 Hz for the 34844

• PWM frequency programmable or synchronizable from 110 to 27,000 Hz for the 34844A

• 32-Ld 5x5x1.0mm TQFN Package

Applications

• Monitors and HDTV - up to 42 inch

• Personal Computer Notebooks

• GPS Screens

• Small screen Televisions

* 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...62

中文翻译

下载PDF

与MC34844EP相关器件

型号	品牌	获取价格	描述	数据表
MC34844EP/R2	FREESCALE	获取价格	10 Channel LED Backlight Driver with Integrated Power Supply
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

与MC34844EP相关文章

英伟达新AI芯片Rubin或提前半年亮相
2024-11-05

19
苹果iPhone 17将全系采用三星/LG显示LTPO OLED面板
2024-11-05

17
三星深化印度制造布局，供应链本地化进程加速
2024-10-29

39
芯擎科技“星辰一号”自动驾驶芯片点亮成功，2025年量产在即
2024-10-29

37

产品中心

服务支持

精选活动

关于我们

帮助中心

MC34844EP

MC34844EP 数据手册

与MC34844EP相关器件

与MC34844EP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

MC34844EP 数据手册

与MC34844EP相关器件

与MC34844EP相关文章

您还可以找

您在本页遇到什么问题？