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PDF RT8473 Data sheet ( Hoja de datos )
| Número de pieza | RT8473 | |
| Descripción | High Brightness LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8473 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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®
RT8473
1A, Hysteretic, High Brightness LED Driver with Internal
Switch
General Description
The RT8473 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 7V to
30V and employs hysteretic control with a high side current
sense resistor to set the constant output current.
The RT8473 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 RT8473 is available in a small TSOT-23-5 package.
Ordering Information
RT8473
Package Type
J5 : TSOT-23-5
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.
Marking Information
05=DNN
05= : Product Code
DNN : Date Code
Features
z 7V 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
23
LX GND ADJ
TSOT-23-5
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8473-00 January 2012
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
7 LED
3 LED
858%5
808%0
757%5
707%0
0
1 LED
VIN = 7V to 30V, ILED = 1A, L = 100μH
7 14 21 28
Input Voltage (V)
35
Output Current vs. Input Voltage
1.04
1 LED
1.03 2 LED
3 LED
1.02 4 LED
5 LED
1.01
6 LED
7 LED
1.00 8 LED
0.99
0.98
0.97
0.96
0
VIN = 7V to 30V, ILED = 1A, L = 100μH
7 14 21 28
Input Voltage (V)
35
Switching Frequency vs. Input Voltage
800
1 LED
700 2 LED
3 LED
600
4 LED
5 LED
6 LED
500 7 LED
8 LED
400
300
200
100
0
VIN = 7V to 30V, ILED = 1A, L = 100μH
7 14 21 28
Input Voltage (V)
35
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8473-00 January 2012
RT8473
Output Current Deviation vs. Input Voltage
6%6
4%4
2%2
3 LED
0%0
1 LED
-2-%2
7 LED
-4-%4
-6-%6
0
VIN = 7V to 30V, ILED = 1A, L = 100μH
7 14 21 28
Input Voltage (V)
35
Output Current Deviation vs. Input Voltage
4%4
1 LED
3%3 2 LED
3 LED
2%2 4 LED
5 LED
1%1
6 LED
7 LED
0%0 8 LED
-1-%1
-2-%2
-3-%3
-4-%4
0
VIN = 7V to 30V, ILED = 1A, L = 100μH
7 14 21 28
Input Voltage (V)
35
1010%00
90%90
80%80
70%70
60%60
50%50
Duty Cycle vs. Input Voltage
1 LED
2 LED
3 LED
4 LED
5 LED
6 LED
7 LED
8 LED
40%40
30%30
20%20
10%10
0%0
0
VIN = 7V to 30V, ILED = 1A, L = 100μH
7 14 21 28
Input Voltage (V)
35
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Sense resistor R1 and R2 (optional)
with short loop between VIN and
SENSE pins.
RT8473
Input capacitor C1 as
close as possible to VIN
and GND pins.
Rectifier diode D1 as close as
possible to LX and VIN pins.
Place the capacitor C2
(optional) as close as
possible to the ADJ pin.
Optional RC snubber R3 and
C4 for lowering EMI.
Sufficient copper at GND
pin for thermal cooling.
Figure 3. PCB Layout Guide (Top Layer)
Figure 4. PCB Layout Guide (Bottom Layer)
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8473-00 January 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8473.PDF ] | |
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