RT8477A datasheet(1/13 Pages) RICHTEK

Part #	RT8477A

Description	High Voltage High Multiple-Topology Current LED Driver

PDF	13 Pages

Scroll/Zoom	100%

Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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1 / 13 page

RT8477A

®

DS8477A-02 April 2015

www.richtek.com

1

Copyright

is a registered trademark of Richtek Technology Corporation.

©

High Voltage High Multiple-Topology Current LED Driver

General Description

The RT8477A is a current mode PWM controller designed

to drive an external MOSFET for high current LED

applications with wide input voltage (4.5V to 50V) and

output voltage (up to 50V) ranges. With internal 380kHz

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 by analog.

The RT8477A is now available in the SOP-8 (Exposed

Pad) package.

Features



Support Multiple-Topologies (Buck / Boost / Buck-

Boost)



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



380kHz Fixed Switching Frequency



Analog or PWM Control Signal for LED Dimming



Internal Soft-Start to Avoid Inrush Current



Under-Voltage Lockout



Thermal Shutdown

Applications



Desk Lights and Room Lighting



Industrial Display Backlight

Simplified Application Circuit

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.

Pin Configurations

(TOP VIEW)

SOP-8 (Exposed Pad)

Marking Information

RT8477A

Package Type

SP : SOP-8 (Exposed Pad-Option 1)

Lead Plating System

G : Green (Halogen Free and Pb Free)

VCC

ISP

ISN

VC

CREG

DRV

CTL

SENS

GND

2

3

4

5

6

7

8

9

RT8477A

GSPYMDNN

RT8477AGSP : Product Number

YMDNN : Date Code

DRV

SENS

VCC

RT8477A

GND

CTL

R1

VIN

C1

ISN

LEDs

D1

C4

L1

R2

M1

Analog Dimming

CREG

C2

R3

C3

VC

R4

C5

ISP

C6

R5

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RT8477A Datasheet(PDF) 1 Page - Richtek Technology Corporation

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