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FAN5617 Datasheet(PDF) 5 Page - Fairchild Semiconductor

Part No. FAN5617
Description  High-Efficiency, Constant-Current LED Driver with TinyWire Brightness Control
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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FAN5617 Datasheet(HTML) 5 Page - Fairchild Semiconductor

 
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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5617 Rev. 1.0.1
Typical Characteristics
Unless otherwise noted, VIN = 3.6V, TA = 25°C, CIN = 4.7µF, COUT = 1µF, CAP1 = CAP2 = 0.1µF, the FAN5617 driving
three LEDs with VF = 3.3V at 20mA.
0
5
10
15
20
25
LED Current (mA)
1X to 1.5X
1.5X to 2X
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
ILED =5mA
ILED =10mA
ILED =15mA
ILED =20mA
100
90
80
70
60
50
40
30
20
10
0
Figure 3. Voltage Multiplication Ratio
vs. LED Current
Figure 4. Efficiency vs. Input Voltage
1.5
0.5
-0.5
-1.5
2.7
3.2
3.7
4.2
4.7
5.2
Input Voltage (V)
ILED =20mA
2.5
2.0
1.5
1.0
0.5
0
2.7
3.2
3.7
4.2
4.7
5.2
Input Voltage (V)
ILED =5mA
Figure 5. LED current vs. Input Voltage
Figure 6. Quiescent Current vs. Input Voltage
200
180
160
140
120
100
80
60
40
20
0
15
9
13
17
LED Current (mA)
VIN =5.5V
VIN =3.6V
VIN =2.7V
21
Figure 7. Minimum Cathode Voltage
Figure 8. Dimming Linearity


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