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SC4541ULTRT Datasheet(PDF) 7 Page - Semtech Corporation |
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SC4541ULTRT Datasheet(HTML) 7 Page - Semtech Corporation |
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7 / 19 page  SC4541 7 Typical Characteristics (continued) 300Hz PWM Dimming, 0.1% Duty Cycle Start-up — by V IN Time (2mS/div) Start up By Vin Test condition: 5Vin, LEDs=6S1P, R1=10Ω ΩΩ Ω , SC4541(1120) SW IL VOUT VIN IL (0.2A/div) VSW (10V/div) VOUT (5V/div) VIN (2.5V/div) Shut Down Time (5mS/div) IL (0.2A/div) VSW (10V/div) VOUT (5V/div) VIN (2.5V/div) Start-up — by PWM Time (0.1S/div) PWM (3V/div) IL (0.3A/div) VSW (10V/div) VOUT (5V/div) Main Power Switching Time (0.5μS/div) IL (0.2A/div) VSW (5V/div) VOUT (50mV/div) VIN (1V/div) 5VIN to 12VIN VIN Fluctuation — Rising Time (2μS/div) VSW (10V/div) VOUT (1V/div) VIN (5V/div) 12VIN to 5VIN VIN Fluctuation — Falling Time (20μS/div) VSW (10V/div) VOUT (1V/div) VIN (5V/div) Conditions: 5V IN, 20mA ,6 LEDs in series, CIN/COUT=1µF, L=10µH Shutdown By Vin Test condition: 5Vin, LEDs=6S1P, R1=10Ω ΩΩ Ω , SC4541(1120) SW IL VOUT VIN Start up By PWM Test condition: 5Vin, LEDs=6S1P, R1=10Ω ΩΩ Ω , SC4541(1120), PWM Dimming 300Hz, 0.1% duty. SW IL VOUT EN VIN Fluctuation - Rising VOUT SW VIN Test condition: 5Vin to 12Vin, LEDs=6S1P, R1=10Ω ΩΩ Ω , SC4541(1120) Mail Power Switching Test condition: 5Vin, LEDs=6S1P, R1=10Ω, SC4541(1120) SW IL VOUT VIN VIN Fluctuation - Falling Test condition: 5Vin to 12Vin, LEDs=6S1P, R1=10Ω ΩΩ Ω , SC4541(1120) VOUT SW VIN • It’s fine under 25°°°°C ambient temperature. |
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