CAT4240_0711 Datasheet, PDF (4/14 Pages) Catalyst Semiconductor – 6 Watt Boost LED Driver

CAT4240
TYPICAL CHARACTERISTICS
VIN = 5V, V_L = 13V, T_AMB = 25ºC, typical application circuit unless otherwise specified.
LED Current vs. Input Voltage
LED Current Regulation
350
RSET = 1Ω
VOUT = 19.5V
300
250
200
RSET = 2Ω
VOUT = 18.8V
150
100
8
9 10 11 12 13 14 15 16
INDUCTOR VOLTAGE [V]
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
8
6 LEDs @ 150mA
9 10 11 12 13 14 15 16
INDUCTOR VOLTAGE [V]
Efficiency vs. Load Current (6 LEDs)
100
Efficiency vs. Inductor Voltage (6 LEDs)
100
95
95
90
90
85
85
80
50
100 150 200 250 300
LED CURRENT [mA]
Power-up with 6 LEDs at 300mA
80
8
9 10 11 12 13 14 15 16
INDUCTOR VOLTAGE [V]
Switching Waveform
Doc. No. MD-5026 Rev. C
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice