CAT4137_11 Datasheet, PDF (6/15 Pages) ON Semiconductor – CMOS Boost Converter - White LED Driver

CAT4137
TYPICAL CHARACTERISTICS
(V_IN = 3.6 V, C_IN = 1.0 mF, C_OUT = 0.22 mF, L = 22 mH with 3 LEDs at 20 mA, T_AMB = 25°C, unless otherwise specified.)
304
1.0
302
300
298
3 LEDs at 20 mA
296
294
−50 −25
0
25
50
75
100
TEMPERATURE (°C)
Figure 14. FB Pin Voltage vs. Temperature
0.8
−40°C
25°C
85°C
0.6
0.4
0.2
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
Figure 15. Shutdown Voltage vs. Input Voltage
2.2
1.10
20 mA per LED
2.1
1.05
2.0
1.9
1.00
1.8
0.95
1.7
1.6
0.90
−50 −25
0
25
50
75
100
−50 −25
0
25
50
75 100
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 16. Under Voltage Lock Out vs.
Temperature
Figure 17. Switching Frequency vs.
Temperature
Figure 18. Switching Waveforms
(3 LEDs in Series)
Figure 19. Switching Waveforms
(2 LEDs in Series)
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