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CAT4238TD-GT3 Datasheet(PDF) 6 Page - ON Semiconductor |
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CAT4238TD-GT3 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 12 page CAT4238 www.onsemi.com 6 TYPICAL CHARACTERISTICS (VIN = 3.6 V, CIN = 4.7 mF, COUT = 0.22 mF, L = 47 mH with 10 LEDs at 20 mA, TAMB = 25°C, unless otherwise specified.) Figure 10. LED Current vs. Input Voltage Figure 11. LED Current Regulation (10 mA) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 5.0 4.5 4.0 3.5 3.0 0 5 10 15 20 25 30 40 5.5 5.0 4.5 4.0 3.5 3.0 −1.0 −0.5 0 0.5 1.0 Figure 12. Efficiency vs. Load Current (10 LEDs) Figure 13. Efficiency vs. Input Voltage (10 LEDs) LED CURRENT (mA) INPUT VOLTAGE (V) 30 25 20 15 10 5 60 70 80 90 100 5.5 4.5 4.0 3.5 3.0 60 70 80 90 100 Figure 14. Power−up with 10 LEDs at 20 mA Figure 15. Switch ON Resistance vs. Input Voltage INPUT VOLTAGE (V) 5.5 5.0 4.5 4.0 3.5 3.0 0 0.5 1.0 1.5 2.0 R1 = 20 W VOUT = 32.5 V VIN = 5 V VIN = 3.6 V 10 LEDs @ 10 mA 5.5 35 R1 = 15 W VOUT = 33 V R1 = 10 W VOUT = 33.8 V 5.0 VOUT = 32.5 V 10 LEDs @ 15 mA VOUT = 33 V 10 LEDs @ 20 mA |
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