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NCP5050
TYPICAL OPERATING CHARACTERISTICS
Channel 1:V OUT
DC Measurement, 5 V/Div
Channel 2:V OUT
AC Measurement, 500 mV/Div
Figure 10. Typical V OUT 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), I OUT = 20 mA
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:SW Pin
DC Measurement, 5 V/Div
Channel 4:LED Current
DC Measurement, 200 mA/Div
Figure 11. Continue Current Mode (CCM),
I OUT = 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 m s/Div
Figure 13. . Startup for 3 LEDs Operating,
I LEDs : 100 mA, R sense = 2.5 W
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 m s/Div
Figure 15. High Frequency Dimming Control,
F = 20 kHz
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