Datasheet > WhiteLED> RT8567A

RT8567A

更新时间： 2024-02-19 04:06:38

品牌	Logo	应用领域
立锜 - RICHTEK		驱动器白色LED灯
页数	文件大小	规格书
13页	288K
描述
6-CH 43V Constant Current LED Driver with PWM Dimming Control

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技术参数
数据手册

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RT8567A 技术参数

Status：	Active	Vin (min) (V)：	2.7
Vin (max) (V)：	24	SW Freq (typ) (kHz)：	1000
Number of LEDs (max) (pcs)：	72	Iout (max)/channel (mA)：	40
Iq (typ) (mA)：	3	Dimming Control：	PWM
Topology：	Boost	Features：	Enable Input;OVP
Package Type：	WQFN3x3-20	Datasheet：	#N/A

RT8567A 数据手册

RT8567A

6-CH 43V Constant Current LED Driver with PWM Dimming

Control

General Description

Features

^zWide Input Voltage : 2.7V to 24V

^zHigh Output Voltage : Up to 43V

^zChannel Current Programmable : 5mA to 40mA

^zChannel Current Regulation with Accuracy 3% and

Matching 2%

The RT8567A is a high efficiency driver for white LEDs. It

is designed for LCDpanels that employ an array of LEDs

as the lighting source. An integrated current mode Boost

controller drives six strings in parallel and supports up to

12 WLEDs per string. The internal current sinks support

a maximum of 2% current mismatching for excellent

brightness uniformity in each string of LEDs. To provide

enough headroom for current sink operation, the Boost

controller monitors the minimum voltage of the feedback

pins and regulates an optimized output voltage for power

efficiency.

^zDimming Controls : External PWM Input Up to 25kHz

^zAdjustable Switching Frequency : 500kHz to 2MHz

^zBuilt-In Soft-Start

^zProtections

` LED Strings Open Detection

` Current Limit Protection

` Programmable Over Voltage Protection

` Over Temperature Protection

The RT8567Ahas a wide input voltage range from 2.7V to

24V and can provide adjustable LEDcurrent from 5mAto

40mA. The internal 250mΩ, 43V power switch with current

mode control provides cycle-by-cycle over current

protection. The RT8567A also integrates PWM dimming

function for accurate LEDcurrent control. The input PWM

dimming frequency can operate from 200Hz to 25kHz

without inducing any inrush in LED current or inductor

current. The switching frequency of the RT8567A is also

adjustable from 500kHz to 2MHz, which allows flexibility

between efficiency and component size.

z 20-Lead WQFN Package

z RoHS Compliant and Halogen Free

Applications

z UMPC andNotebook Computer Backlight

z GPS, Portable DVD Backlight

Simplified Application Circuit

OUT

OVP2

VIN

Chip Enable

OVP

RT8567A

6 x 12 LEDs

OVP1

PWM

CH1

CH2

CH3

CH4

CH5

CH6

PWM Signal

ISET

GND

is a registered trademark of Richtek Technology Corporation.

DS8567A-00 April 2012

www.richtek.com

12 3 4 5 6 7...13

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