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RT8474A Datasheet(PDF) 1 Page - Richtek Technology Corporation

Part No. RT8474A
Description  High Voltage Multiple-Topology LED Driver
Download  13 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8474A Datasheet(HTML) 1 Page - Richtek Technology Corporation

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RT8474A
®
DS8474A-05 April 2015
www.richtek.com
1
©
Copyright
2015 Richtek Technology Corporation. All rights reserved.
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


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