CAT4238
TYPICAL CHARACTERISTICS
(V IN = 3.6 V, C IN = 4.7 m F, C OUT = 0.22 m F, L = 47 m H with 10 LEDs at 20 mA, T AMB = 25 ° C, unless otherwise specified.)
150
125
100
75
VFB = 0.4 V
2.0
1.5
1.0
0.5
50
3.0
3.5
4.0
4.5
5.0
5.5
0
3.0
3.5
4.0
4.5
5.0
5.5
303
INPUT VOLTAGE (V)
Figure 4. Quiescent Current vs. V IN
(Not Switching)
310
INPUT VOLTAGE (V)
Figure 5. Quiescent Current vs. V IN
(Switching)
302
305
301
300
300
299
295
298
10 LEDs
297
? 50
0
50
100
150
290
5
10
15
20
25
30
1.2
1.1
1.0
TEMPERATURE ( ° C)
Figure 6. FB Pin Voltage vs. Temperature
SW
20V/div
Inductor
Current
100mA/div
OUTPUT CURRENT (mA)
Figure 7. FB Pin Voltage vs. Output Current
0.9
0.8
3.0
3.5
4.0
4.5
5.0
VOUT
AC coupled
500mV/div
5.5
500 ns/div
INPUT VOLTAGE (V)
Figure 8. Switching Frequency vs. Supply
Voltage
http://onsemi.com
5
Figure 9. Switching Waveforms
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