W-6238 Datasheet, PDF (6/14 Pages) Copal Electronics – High Efficiency 10 LED Boost Converter

W-6238
TYPICAL CHARACTERISTICS
V_IN = 3.6V, C_IN = 4.7µF, C_OUT = 0.22µF, L = 47µH with 10 LEDs at 20mA, T_AMB = 25ºC, unless otherwise specified.
LED Current vs. Input Voltage
40
35
30
25
20
15
10
5
0
3.0
R1 = 10Ÿ
VOUT = 33.8V
R1 = 15Ÿ
VOUT = 33V
R1 = 20Ÿ
VOUT = 32.5V
3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
LED Current Regulation (10mA)
1.0
0.5
0.0
-0.5
-1.0
3.0
10 LEDs @ 10mA
3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
Efficiency vs. Load Current (10 LEDs)
100
Efficiency vs. Input Voltage (10 LEDs)
100
90
VIN = 5V
VOUT = 32.5V
90
10 LEDs @ 15mA
80
VIN = 3.6V
70
60
5
10 15 20 25 30
LED CURRENT [mA]
Power-up with 10 LEDs at 20mA
80
VOUT = 33V
70
10 LEDs @ 20mA
60
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
Switch ON Resistance vs. Input Voltage
2.0
1.5
1.0
0.5
0.0
3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
Doc. No. MD-5019 Rev. D
6
© NIDEC COPAL ELECTRONICS CORP.
Characteristics subject to change without notice