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Typical Characteristics (Continued)
Unless otherwise noted, C IN = 4.7μF, V EN =1.8V, T A = 25°C, white LED with V F =3.3V at I OUT =10mA.
1
0
4 LEDs
I OUT =2.5mA
V OUT =13V
V OUT =11V
0.18
0.15
V IN =18V
I OUT =10mA
-1
0.12
-2
I OUT =25mA
0.09
-3
-4
Approaching
Dropout Region
0.06
0.03
I OUT =25mA
-5
12
13
14
15
16
17
18
19
20
0
5
7
9
11
13
15
Input Voltage (V)
Figure 10. Line Regulation
Output Voltage (V)
Figure 11. Variation of I OUT Current vs. Output Voltage
100
10
1
284
283
282
281
280
279
278
277
276
V IN =18V, V EN =1.8V
2 LEDs
4 LEDs
2 LEDs
0.1
1
10
100
1000
275
0
5
10
15
20
25
30
R EXT (k )
Figure 12. I OUT Current vs. R EXT Voltage
I OUT Current (mA)
Figure 13. Current Mirror Ratio vs. LED Current
30
25
20
15
10
V IN =18V, V EN =1.8V
Fpwm=300Hz
I OUT =2.5mA
I OUT =25mA
3.0
2.5
2.0
1.5
1.0
30
25
20
15
10
V IN =18V, V EN =1.8V
Fpwm=300Hz
I OUT =2.5mA
I OUT =25mA
3.0
2.5
2.0
1.5
1.0
5
0.5
5
0.5
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0.0
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0.0
Duty Cycle
Figure 14. PWM Dimming on EN Pin
? 2006 Fairchild Semiconductor Corporation
FAN5640 ? Rev. 1.0.2
6
Duty Cycle
Figure 15. PWM Dimming on VIN Pin
www.fairchildsemi.com
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