CAT4201
TYPICAL OPERATION CHARACTERISTICS
(V IN = 13 V, I LED = 300 mA, L = 22 m H, C 1 = 4.7 m F, C 2 = 10 m F, T AMB = 25 ° C unless otherwise specified)
500
700
400
150 mA
600
150 mA
500
300
400
200
300 mA
300
300 mA
200
100
100
0
8
12
16
20
24
28
0
8
12
16
20
24
28
500
INPUT VOLTAGE (V)
Figure 8. Switching Frequency vs. Input
Voltage (1 LED)
VIN = 13 V
2.0
INPUT VOLTAGE (V)
Figure 9. Switching Frequency vs. Input
Voltage (2 LEDs)
400
150 mA
1.6
1.2
300
0.8
200
300 mA
0.4
100
? 40
0
40
80
120
0
8
10
12
14
16
18
20
22
24
100
TEMPERATURE ( ° C)
Figure 10. Switching Frequency vs.
Temperature
100
INPUT VOLTAGE (V)
Figure 11. Switch ON Resistance vs. Input
Voltage
95
90
95
90
150 mA
85
80
75
150 mA
300 mA
85
80
75
300 mA
70
8
10
12
14
16
18
20
22
24
70
8
10
12
14
16
18
20
22
24
INPUT VOLTAGE (V)
Figure 12. Efficiency vs. Input Voltage (1 LED)
INPUT VOLTAGE (V)
Figure 13. Efficiency vs. Input Voltage
(2 LEDs)
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