CAT4238
TYPICAL CHARACTERISTICS
(V IN = 3.6 V, C IN = 4.7 m F, C OUT = 0.22 m F, L = 47 m H with 10 LEDs at 20 mA, T AMB = 25 ° C, unless otherwise specified.)
40
1.0
35
30
25
20
15
10
5
R1 = 10 W
VOUT = 33.8 V
R1 = 15 W
VOUT = 33 V
R1 = 20 W
VOUT = 32.5 V
0.5
0
? 0.5
10 LEDs @ 10 mA
0
3.0
3.5
4.0
4.5
5.0
5.5
? 1.0
3.0
3.5
4.0
4.5
5.0
5.5
100
INPUT VOLTAGE (V)
Figure 10. LED Current vs. Input Voltage
100
INPUT VOLTAGE (V)
Figure 11. LED Current Regulation (10 mA)
90
VIN = 5 V
90
VOUT = 32.5 V
10 LEDs @ 15 mA
80
80
VOUT = 33 V
70
VIN = 3.6 V
70
10 LEDs @ 20 mA
60
5
10
15
20
25
30
60
3.0
3.5
4.0
4.5
5.0
5.5
LED CURRENT (mA)
Figure 12. Efficiency vs. Load Current
(10 LEDs)
2.0
1.5
1.0
0.5
INPUT VOLTAGE (V)
Figure 13. Efficiency vs. Input Voltage
(10 LEDs)
0
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
Figure 14. Power ? up with 10 LEDs at 20 mA
Figure 15. Switch ON Resistance vs. Input
Voltage
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