W-6237 Datasheet, PDF (5/13 Pages) Copal Electronics – High Voltage CMOS Boost

W-6237
TYPICAL CHARACTERISTICS
(V_IN = 3.6 V, C_IN = 4.7 F, C_OUT = 0.22 F, L = 33 H with 8 LEDs at 20 mA, T_AMB = 25$C, unless otherwise specified.)
140
2.0
120
1.5
100
80
60
40
VFB = 0.4 V
(not switching)
20
0
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8
INPUT VOLTAGE (V)
Figure 4. Quiescent Current vs. V_IN
(Not Switching)
1.0
0.5
0
2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
Figure 5. Quiescent Current vs. V_IN
(Switching)
315
310
8 LEDs at 20 mA
VOUT = 26 V
305
315
310
8 LEDs
305
300
300
295
295
290
285
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8
INPUT VOLTAGE (V)
Figure 6. FB Pin Voltage vs. Supply Voltage
290
285
0
5
10
15
20
25
30
OUTPUT CURRENT (mA)
Figure 7. FB Pin Voltage vs. Output Current
1040
1020
SW pin
20V/div
1000
Inductor
Current
100mA/div
980
VOUT
AC coupled
200mV/div
960
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8
INPUT VOLTAGE (V)
Figure 8. Switching Frequency vs. Supply
Voltage
0.5 sec/div
Figure 9. Switching Waveforms
5