Datasheet > 34844

34844

更新时间： 2022-12-14 19:15:10

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		驱动器
页数	文件大小	规格书
36页	1827K
描述
10 Channel LED Backlight Driver with Integrated Power Supply

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34844 数据手册

Document Number: 34844

Rev. 3.0, 11/2008

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 7V to 28V,

the 34844 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 600kHz, but may be programmed via

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

100Hz to 25kHz, 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

Features

Device

Package

Range (T )

• Input voltage of 7.0 to 28V

MC34844EP/R2

-40°C to 105°C

32 QFN-EP

• Boost output voltage up to 60V, with Dynamic

Headroom Control (DHC)

• 3.0A integrated boost FET

Applications

• Up to 50mA 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

100Hz to 25,000Hz

• 32-Ld 5x5x1.0mm 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...36

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与34844相关器件

型号	品牌	描述	获取价格	数据表
34844_08	FREESCALE	10 Channel LED Backlight Driver with Integrated Power Supply	获取价格
34844_09	FREESCALE	10 Channel LED Backlight Driver with Integrated Power Supply	获取价格
34845	FREESCALE	Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply	获取价格
34845A	FREESCALE	Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply	获取价格
34845B	FREESCALE	Low Cost 6 Channel LED Backlight Driver with Integrated Power Supply	获取价格
348-5005-025	AMPHENOL	Board Connector, 30 Contact(s), 6 Row(s), Male, Straight, Solder Terminal,	获取价格

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