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Richtek Technology - High Voltage Buck LED Driver

Numéro de référence RT4528
Description High Voltage Buck LED Driver
Fabricant Richtek Technology 
Logo Richtek Technology 





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RT4528 fiche technique
®
RT4528
High Voltage Buck LED Driver with Dimming Control
General Description
The RT4528 is a current-mode LED driver supporting wide
input voltage range from 4.5V to 50V and output voltage
up to 50V. With 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 RT4528
provides an internal soft-start function to avoid inrush
current and thermal shutdown to prevent the device from
overheat.
The RT4528 is available in the SOP-8 (Exposed pad)
package.
Ordering Information
RT4528
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.
Features
High Voltage : VIN Up to 50V, VOUT Up to 50V
Built-In 3A 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
Under-Voltage Lockout
Thermal Shutdown
RoHS Compliant and Halogen Free
Applications
Desk Lights and Room Lighting
Industrial Display Backlight
Marking Information
RT4528
GSPYMDNN
RT4528GSP : Product Number
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
VCC
ISP
ISN
NC
8
27
GND
36
9
45
CREG
SW
CTL
VC
SOP-8 (Exposed Pad)
Simplified Application Circuit
VIN
Analog Dimming
or PWM Dimming
C1 RT4528
VCC
ISP
CTL ISN
RSENSE
R1
R2
C2
VC
SW
CREG
C3 GND
L1
D1
C4
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS4528-00 April 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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