RT8474A datasheet(1/13 Pages) RICHTEK

номер детали	RT8474A

подробное описание детали	High Voltage Multiple-Topology LED Driver

PDF	13 Pages

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производитель	RICHTEK [Richtek Technology Corporation]

домашняя страница	http://www.richtek.com

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RT8474A

®

DS8474A-05 April 2015

www.richtek.com

1

©

Copyright

is a registered trademark of Richtek Technology Corporation.

Applications



Desk Lights and Room Lighting



Industrial Display Backlight

General Description

The RT8474A is a current-mode LED driver supporting wide

input voltage range from 4.5V to 50V in multiple topologies.

With the internal 500kHz operating frequency, the size of

the external PWM inductor and input/output capacitors

can be minimized. High efficiency is achieved by a 100mV

current sensing control. LED dimming control can be done

from either analog or PWM signal. The RT8474A provides

an internal soft-start function to avoid inrush current and

thermal shutdown to prevent the device from overheat.

The RT8474A is available in the SOP-8 (Exposed pad)

package.

Simplified Application Circuit

High Voltage Multiple-Topology LED Driver

with Open Detection

Features



High Voltage : VIN Up to 50V, VOUT Up to 50V



Support Multiple-Topologies (Buck / Boost / Buck-

Boost)



Built-In 2A Power Switch



Current-Mode PWM Control



500kHz Fixed Switching Frequency



Analog or PWM Control Signal for LED Dimming



Internal Soft-Start to Avoid Inrush Current



OVP Pin for Adjustable OVP Level Protection (for

Buck Only)



Under-Voltage Lockout



Thermal Shutdown



RoHS Compliant and Halogen Free

Ordering Information

Note :

Richtek products are :

 RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

 Suitable for use in SnPb or Pb-free soldering processes.

Marking Information

RT8474AGSP : Product Number

YMDNN : Date Code

RT8474A

GSPYMDNN

RT8474A

Package Type

SP : SOP-8 (Exposed-Option 2)

Lead Plating System

G : Green (Halogen Free and Pb Free)

RT8474A

ISN

OVP

VCC

CREG

VC

GND

SW

ISP

Analog Dimming

or PWM Dimming

CTL

C3

C1

R3

R4

L1

D1

C4

VIN

RSENSE

R1

C2

R2

C5

R5

Аналогичный номер детали - RT8474A

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Richtek Technology Corp...	RT8471	237Kb / 15P	Hysteretic, High Brightness LED Driver
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Аналогичное описание - RT8474A

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Аналогичный номер детали - RT8474A

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