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PDF RT8477 Data sheet ( Hoja de datos )
| Número de pieza | RT8477 | |
| Descripción | High Voltage High Current LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8477
High Voltage High Current LED Driver
General Description
The RT8477 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 RT8477 is now available in the SOP-8 package.
Ordering Information
RT8477
Package Type
S : SOP-8
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, Boost 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
RoHS Compliant and Halogen Free
Applications
Desk Lights and Room Lighting
Industrial Display Backlight
Pin Configurations
(TOP VIEW)
VCC
ISP
ISN
CTL
2
3
4
8 CREG
7 DRV
6 GND
5 SENS
SOP-8
Marking Information
RT8477
GSYMDNN
RT8477GS : Product Number
YMDNN : Date Code
Simplified Application Circuit
VIN
Analog Dimming
C1
RT8477
VCC
ISP
CTL
CREG
C2
GND
ISN
DRV
SENS
D1
R1
LEDs
C4
L1
R3
C3
M1
R2
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8477-00 December 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Typical Application Circuit
VIN
4.5V to 50V
Analog Dimming
C1
10µF
1
RT8477
VCC
ISP
2
4 CTL
8 CREG
C2
1µF 6 GND
3
ISN
DRV 7
SENS 5
R1
0.1
RT8477
D1
LEDs
C4
1µF
L1
22µH
R3 51
C3
1nF
M1
R2
0.05
Figure 1. Buck Configuration
VIN
Analog Dimming
L1
22µH
C1
10µF
RT8477
1 VCC
DRV
7
4 CTL
8 CREG
5
SENS
C2
1µF 6 GND
ISP 2
ISN 3
R3 51
C3
1nF
D1
M1
R2
0.05
Figure 2. Boost Configuration
R1
0.1
C4
1µF
VOUT
50V(Max)
LEDs
51
VF
(VF > VLEDs)
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8477-00 December 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Outline Dimension
A
JB
H
M
RT8477
F
C
I
D
Symbol
A
B
C
D
F
H
I
J
M
Dimensions In Millimeters
Min Max
4.801
5.004
3.810
3.988
1.346
1.753
0.330
0.508
1.194
1.346
0.170
0.254
0.050
0.254
5.791
6.200
0.400
1.270
Dimensions In Inches
Min Max
0.189
0.197
0.150
0.157
0.053
0.069
0.013
0.020
0.047
0.053
0.007
0.010
0.002
0.010
0.228
0.244
0.016
0.050
8-Lead SOP Plastic Package
Richtek Technology Corporation
14F, No. 8, Tai Yuen 1st Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
DS8477-00 December 2013
www.richtek.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet RT8477.PDF ] | |
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