NCP5050(2007) 查看數據表（PDF） - ON Semiconductor

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NCP5050
(Rev.:2007)

4.5 W Flash White LED Boost Driver

ON Semiconductor 

NCP5050

TYPICAL OPERATING CHARACTERISTICS

Channel 1:VOUT

DC Measurement, 5 V/Div

Channel 2:VOUT

AC Measurement, 500 mV/Div

Figure 10. Typical VOUT Ripple in OVP

Condition, No Load

Channel 1:SW Pin

DC Measurement, 5 V/Div

Channel 4:LED Current

DC Measurement, 100 mA/Div

Figure 12. Discontinuous Current Mode

(DCM), IOUT = 20 mA

Channel 1:SW Pin

DC Measurement, 5 V/Div

Channel 4:LED Current

DC Measurement, 200 mA/Div

Figure 11. Continue Current Mode (CCM),

IOUT = 100 mA

Channel 1:CRTL Pin

DC Measurement, 5 V/Div

Channel 2: FB Pin, 200 mV/Div

Channel 3: Input current,

200 mA/Div

Channel 4: LED Current,

500 mV/Div, t = 50 ms/Div

Figure 13. . Startup for 3 LEDs Operating,

ILEDs: 100 mA, Rsense = 2.5 W

Channel 1: CTRL Pin, 5 V/Div, DC Measurement

Channel 2: FB Pin, DC, 200 mV/Div

Channel 3: Input Current, 200 mA/Div

Channel 4: ILED, 50 mA/Div, t = 1.0 ms/Div

Figure 14. Low Frequency Dimming Control,

F = 250 Hz

Channel 1: CTRL Pin, 5 V/Div, DC Measurement

Channel 2: FB Pin, 200 mV/Div, DC Measurement

Channel 3: Input Current, 500 mA/Div

Channel 4: ILED, 50 mA/Div, t = 10 ms/Div

Figure 15. High Frequency Dimming Control,

F = 20 kHz

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