W-6137 Datasheet, PDF (5/16 Pages) Copal Electronics – CMOS Boost Converter

W-6137
TYPICAL CHARACTERISTICS
(V_IN = 3.6 V, C_IN = 1.0 F, C_OUT = 0.22 F, L = 22 H with 3 LEDs at 20 mA, T_AMB = 25$C, unless otherwise specified.)
35
0.4
R_FB = 10
30
25
0.2
R_FB = 15
20
R_FB = 20
0
15
10
5
0
2.0 2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
Figure 8. LED Current vs. Input Voltage
(3 LEDs)
100
ï0.2
ï0.4
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Figure 9. LED Current Regulation
100
90
15 mA
80
20 mA
70
90
VIN = 4.2 V
VIN = 3.6 V
80
70
60
2.0 2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
Figure 10. Efficiency across Supply Voltage
(3 LEDs)
100
60
0
5
10
15
20
25
30
LED CURRENT (mA)
Figure 11. Efficiency across Load Current
(3 LEDs)
100
90
15 mA
80
20 mA
70
90
VIN = 4.2 V
VIN = 3.6 V
80
70
60
2.0 2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
Figure 12. Efficiency across Supply Voltage
(4 LEDs)
60
0
5
10
15
20
25
30
LED CURRENT (mA)
Figure 13. Efficiency across Load Current
(4 LEDs)
5