 English |
|
|
|
|
|
|
|
| RT8477A Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – High Voltage High Multiple-Topology Current LED Driver | |||
| |||
|
®
RT8477A
High Voltage High Multiple-Topology 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 :
ï½ RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
ï½ Suitable for use in SnPb or Pb-free soldering processes.
Features
ï¬ Support Multiple-Topologies (Buck / Boost / Buck-
Boost)
ï¬ High Voltage : VIN up to 50V, VOUT up to 50V
ï¬ 380kHz Fixed Switching Frequency
ï¬ Analog or PWM Control Signal for LED Dimming
ï¬ Internal Soft-Start to Avoid Inrush Current
ï¬ Under-Voltage Lockout
ï¬ Thermal Shutdown
Applications
ï¬ Desk Lights and Room Lighting
ï¬ Industrial Display Backlight
Pin Configurations
(TOP VIEW)
VCC
ISP
ISN
VC
8
2
7
GND
3
6
9
4
5
CREG
DRV
SENS
CTL
SOP-8 (Exposed Pad)
Marking Information
RT8477AGSP : Product Number
RT8477A
GSPYMDNN
YMDNN : Date Code
Simplified Application Circuit
R1
VIN
C1
R5
RT8477A
VCC
ISP
C6
ISN
Analog Dimming
CTL
DRV
CREG SENS
C2
R4
VC
GND
C5
D1
C4
LEDs
L1
M1
R3
C3
R2
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8477A-02 April 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese