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PDF RT8472 Data sheet ( Hoja de datos )
| Número de pieza | RT8472 | |
| Descripción | High Brightness LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8472 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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®
RT8472
1A, Hysteretic, High Brightness LED Driver with Internal
Switch
General Description
The RT8472 is a high efficiency, continuous mode inductive
step-down converter, designed for driving single or multiple
series connected LEDs from a voltage source higher than
the LED voltage. It operates from an input voltage of 5V to
30V and employs hysteretic control with a high side current
sense resistor to set the constant output current.
The RT8472 includes an output switch and a high side
output current sensing circuit, which uses an external
resistor to set the nominal average output current. LED
brightness control is achieved with PWM dimming from
an analog or PWM input signal.
The RT8472 is available in a small TSOT-23-5 package.
Ordering Information
RT8472
Package Type
J5 : TSOT-23-5
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
z 5V to 30V Input Voltage Range
z Hysteretic Control with High Side Current Sensing
z Internal N-MOSFET with 350mΩ Low RDS(ON)
z 1A Output Current
z Up to 97% Efficiency
z Typical ±5% LED Current Accuracy
z Analog or PWM Control Signal for LED Dimming
z 300Hz On-Board Ramp Generator
z Input Under Voltage Lockout
z Thermal Shutdown Protection
z RoHS Compliant and Halogen Free
Applications
z Automotive LED Lighting
z High Power LED Lighting
z Indicator and Emergency Lighting
z Architectural Lighting
z Low Voltage Industrial Lighting
z Signage and Decorative LED Lighting
Pin Configurations
(TOP VIEW)
VIN SENSE
54
Marking Information
07=DNN
07= : Product Code
DNN : Date Code
23
LX GND ADJ
TSOT-23-5
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8472-01 March 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Typical Operating Characteristics
10100%0
959%5
909%0
Efficiency vs. Input Voltage
3 LED
2 LED
858%5
808%0
1 LED
757%5
707%0
0
VIN = 5V to 30V, ILED = 1A, L = 33μH
7 14 21 28
Input Voltage (V)
35
Output Current vs. Input Voltage
1.04
1.03
1.02
1.01 1 LED
1
2 LED
3 LED
0.99
4 LED
5 LED
0.98
6 LED
7 LED
0.97 8 LED
0.96
0
7
VIN = 5V to 30V, ILED = 1A, L = 33μH
14 21
Input Voltage (V)
28
35
Switching Frequency vs. Input Voltage
850
750
650
550 1 LED
2 LED
450 3 LED
4 LED
350 5 LED
6 LED
250 7 LED
8 LED
150
50
0
7
VIN = 5V to 30V, ILED = 1A, L = 33μH
14 21
Input Voltage(V)
28
35
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8472-01 March 2013
RT8472
Output Current Deviation vs. Input Voltage
6%6
4%4
2%2 3 LED
2 LED
0%0
-2%-2 1 LED
-4%-4
-6%-6
0
VIN = 5V to 30V, ILED = 1A, L = 33μH
7 14 21 28
Input Voltage (V)
35
Output Current Deviation vs. Input Voltage
4%4
3%3
2%2
1%1
0%0 1 LED
2 LED
-1%-1 3 LED
4 LED
-2%-2
5 LED
6 LED
-3%-3
7 LED
8 LED
-4%-4
0
7
VIN = 5V to 30V, ILED = 1A, L = 33μH
14 21
Input Voltage (V)
28
35
1001%00
Duty Cycle vs. Input Voltage
90%90
80%80
70%70
60%60
50%50
40%40
30%30
20%20
1 LED
2 LED
3 LED
4 LED
5 LED
6 LED
7 LED
8 LED
10%10
0%0
0
VIN = 5V to 30V, ILED = 1A, L = 33μH
7 14 21 28
Input Voltage (V)
35
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Outline Dimension
D
CB
H
L
RT8472
b
A
e
A1
Symbol
A
A1
B
b
C
D
e
H
L
Dimensions In Millimeters
Min Max
0.700
1.000
0.000
0.100
1.397
1.803
0.300
0.559
2.591
3.000
2.692
3.099
0.838
1.041
0.080
0.254
0.300
0.610
Dimensions In Inches
Min Max
0.028
0.039
0.000
0.004
0.055
0.071
0.012
0.022
0.102
0.118
0.106
0.122
0.033
0.041
0.003
0.010
0.012
0.024
TSOT-23-5 Surface Mount Package
Richtek Technology Corporation
5F, No. 20, Taiyuen 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.
DS8472-01 March 2013
www.richtek.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet RT8472.PDF ] | |
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