RT8477 Datasheet PDF - Richtek

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RT8477
Richtek

Part Number RT8477
Description High Voltage High Current LED Driver
Page 11 Pages


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®
RT8477
High Voltage High Current LED Driver
General Description
The RT8477 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 RT8477 is now available in the SOP-8 package.
Ordering Information
RT8477
Package Type
S : SOP-8
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Features
Buck, Boost Constant Current Converter
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
RoHS Compliant and Halogen Free
Applications
Desk Lights and Room Lighting
Industrial Display Backlight
Pin Configurations
(TOP VIEW)
VCC
ISP
ISN
CTL
2
3
4
8 CREG
7 DRV
6 GND
5 SENS
SOP-8
Marking Information
RT8477
GSYMDNN
RT8477GS : Product Number
YMDNN : Date Code
Simplified Application Circuit
VIN
Analog Dimming
C1
RT8477
VCC
ISP
CTL
CREG
C2
GND
ISN
DRV
SENS
D1
R1
LEDs
C4
L1
R3
C3
M1
R2
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8477-00 December 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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RT8477 datasheet pdf
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