RT8477A Datasheet PDF - Richtek

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RT8477A
Richtek

Part Number RT8477A
Description High Voltage High Current LED Driver
Page 12 Pages


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®
RT8477A
High Voltage High 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.
Ordering Information
RT8477A
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
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 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
Applications
Desk Lights and Room Lighting
Industrial Display Backlight
Pin Configurations
(TOP VIEW)
VCC
ISP
ISN
VC
8
27
GND
36
9
45
CREG
DRV
SENS
CTL
SOP-8 (Exposed Pad)
Marking Information
RT8477AGSP : Product Number
RT8477A
GSPYMDNN
YMDNN : Date Code
Simplified Application Circuit
VIN
Analog Dimming
C1
R5
RT8477A
VCC
C6
ISP
ISN
CTL DRV
CREG SENS
C2
GND
VC
R1
R4
C5
D1
LEDs
C4
L1
R3
C3
M1
R2
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8477A-01 December 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8477A datasheet pdf
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