W-52 Datasheet, PDF (5/11 Pages) Copal Electronics – CMOS White LED Driver

W-52
TYPICAL CHARACTERISTICS
(V_IN = 3.6 V, T_AMB = 25$C, C_IN = 4.7 F, C_OUT = 1 F, L = 6.8 H, unless otherwise specified.)
1.0
1.0
0.8
0.8
0.6
0.6
V_IN = 3 V
0.4
0.4
0.2
0
2
3
4
5
6
INPUT VOLTAGE (V)
Figure 8. Switch Resistance vs. Input Voltage
0.2
0
ï50 ï25
0
25 50 75 100 125
TEMPERATURE ($C)
Figure 9. Switch Resistance vs. Temperature
300
250
200
150
100
50
0
0
8
16
24
32
40
LED CURRENT (mA)
Figure 10. LED Pin Voltage vs. LED Current
85
Figure 11. V_SW, I_L, & V_OUT Signal Waveforms
80
75
70
4 LEDs at 15 mA
V_OUT = 13 V
65
60
2
3
4
5
6
INPUT VOLTAGE (V)
Figure 12. Efficiency vs. Input Voltage
Figure 13. PWM on SHDN Pin Waveform
5