CAT4240 Datasheet, PDF (4/12 Pages) Catalyst Semiconductor – 6 Watt Boost LED Driver

CAT4240
TYPICAL CHARACTERISTICS
(V_IN = 5 V, V_L = 13 V, T_AMB = 25°C, typical application circuit unless otherwise specified.)
350
2.0
RSET = 1 W
VOUT = 19.5 V
1.5
300
1.0
250
200
RSET = 2 W
VOUT = 18.8 V
150
100
8 9 10 11 12 13 14 15 16
INDUCTOR VOLTAGE (V)
Figure 8. LED Current vs. Input Voltage
0.5
0
−0.5
−1.0
−1.5
−2.0
8
6 LEDs @ 150 mA
9 10 11 12 13 14 15 16
INDUCTOR VOLTAGE (V)
Figure 9. LED Current Regulation
100
100
95
95
90
90
85
85
80
50
100
150
200
250
300
LED CURRENT (mA)
Figure 10. Efficiency vs. Load Current
(6 LEDs)
80
8 9 10 11 12 13 14 15 16
INDUCTOR VOLTAGE (V)
Figure 11. Efficiency vs. Inductor Voltage
(6 LEDs)
Figure 12. Power−up with 6 LEDs at 300 mA
Figure 13. Switching Waveform
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