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Richtek - High Voltage Multiple-Topology LED Driver

Numéro de référence RT8474A
Description High Voltage Multiple-Topology LED Driver
Fabricant Richtek 
Logo Richtek 





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RT8474A fiche technique
®
RT8474A
High Voltage Multiple-Topology LED Driver
with Open Detection
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.
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
RT8474A
Package Type
SP : SOP-8 (Exposed-Option 2)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Applications
Desk Lights and Room Lighting
Industrial Display Backlight
Marking Information
RT8474A
GSPYMDNN
RT8474AGSP : Product Number
YMDNN : Date Code
Simplified Application Circuit
VIN
Analog Dimming
or PWM Dimming
R5 C1
RT8474A
VCC
C5 ISP
ISN
CTL
R1
R2
C2
SW
VC
CREG
OVP
C3 GND
RSENSE
L1
D1
C4 R4
R3
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8474A-05 April 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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