CAT4201_15 Datasheet, PDF (5/12 Pages) ON Semiconductor – High Efficiency Step Down LED Driver

CAT4201
TYPICAL OPERATION CHARACTERISTICS
(V_IN = 13 V, I_LED = 300 mA, L = 22 mH, C₁ = 4.7 mF, C₂ = 10 mF, T_AMB = 25°C unless otherwise specified)
100
95
2 LEDs
90
85
80
1 LED
75
70
100
150
200
250
300
350
LED CURRENT (mA)
Figure 14. Efficiency vs. LED Current
10
8
VIN = 13 V
6
4
2
0
−2
−4
−6
−8
−10
−40
0
40
80
120
TEMPERATURE (°C)
Figure 15. LED Current Regulation vs.
Temperature
350
V_F = 3.3 V
300
300 mA
250
350
V_F = 3.3 V
300
300 mA
250
200
V_F = 3.1 V
150
150 mA
100
200
V_F = 3.1 V
150
150 mA
100
50
0
0
4
8
12
16
20 24
28
INPUT VOLTAGE (V)
Figure 16. LED Current vs. Input Voltage
(1 LED)
50
0
0
4
8
12
16
20
24 28
INPUT VOLTAGE (V)
Figure 17. LED Current vs. Input Voltage
(2 LEDs)
SW
5V/div
Inductor
Current
200mA/
div
2 ms/div
Figure 18. Switching Waveforms
CTRL
5V/div
LED
Current
200mA/
div
40 ms/div
Figure 19. CTRL Power−up
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