RT8489 datasheet(1/16 Pages) RICHTEK

부품명	RT8489

상세설명	High Voltage 4-CH LED Driver Controller

PDF	16 Pages

Scroll/Zoom	100%

제조업체	RICHTEK [Richtek Technology Corporation]

홈페이지	http://www.richtek.com

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1 / 16 page

RT8489

®

DS8489-00 November 2012

www.richtek.com

1

is a registered trademark of Richtek Technology Corporation.

©

High Voltage 4-CH LED Driver Controller

Features

Wide Operation Voltage Range : 7V to 28V

Programmable Channel Current

3% Current Matching Accuracy between Channels

Adjustable Switching Frequency

Easy Analog and Digital Dimming Control

Adjustable Soft-Start

Adjustable Output Over Voltage Protection

Under Voltage Lockout and Thermal Shutdown

SOP-24 package

RoHS Compliant and Halogen Free

General Description

The RT8489 is a 4-CH LED driver controller that delivers

well matched LED current to each channel of LED string.

With external current sources, the number of LEDs per

string is only limited by the current source and the VIN/

VOUT conditions. The current mode PWM Boost type

controller operates at an adjustable switching frequency

of up to 1MHz, with a wide VIN range covering from 7V to

28V. The switch driver is designed to drive industrial grade

high power MOSFETs.

The PWM loop selects and regulates the LED string with

the highest voltage string to 0.7V, thus allowing voltage

mismatches between the LED strings. The RT8489

automatically detects and excludes any open and/or

broken strings during operation from the PWM loop to

prevent VOUT from over voltage.

The LED currents on all channels are simply adjustable

with a resistor on each channel. Three convenient dimming

methods are provided : 1. Analog dimming is linearly

controlled by an external voltage. 2. True digitally

controlled PWM dimming can regulate the duty cycle of

the LED current. 3. For noise free PWM dimming, use an

on board output clamping amplifier as a low pass filter to

convert PWM dimming signals into analog dimming

signals.

Applications

Building and Street Lighting

LED TV Backlight

LED Monitor Backlight

Industrial Display Backlight

Other protection features include adjustable output over

voltage protection, PWM switch current limit and thermal

shutdown.

Simplified Application Circuit

RSET

VC

SS

GATE

ISENSE

LED1

RT8489

DCTL

ACTL

GND

VCC

GATE1

SENSE1

LED4

GATE4

SENSE4

VIN

L1

CIN

CVCC

RSET

RVC

CVC

CSS

MSW

RSENSE

M1

RS1

M4

RS4

D1

COUT

VOUT

R3

4 x N LEDs

VCC

……

유사한 부품 번호 - RT8489

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Richtek Technology Corp...	RT8487	781Kb / 13P	High Efficiency BCM LED Driver Controller for High Power

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RT8489 데이터시트(PDF) 1 Page - Richtek Technology Corporation

RT8489 데이터시트(HTML) 1 Page - Richtek Technology Corporation

유사한 부품 번호 - RT8489

유사한 설명 - RT8489

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