ncp5050 ON Semiconductor, ncp5050 Datasheet - Page 7

• Manufacturer Part Number: ncp5050
• Description: 4.5 W Inductive Boost Led Driver For Flash And Lcd Backlight
• Manufacturer: ON Semiconductor

Figure 14. Low Frequency Dimming Control,
Channel 1:V
Channel 2:V
Channel 1: CTRL Pin, 5 V/Div, DC Measurement
Channel 3: Input Current, 200 mA/Div
Channel 4: ILED, 50 mA/Div, t = 1.0 ms/Div
Figure 10. Typical V
Figure 12. Discontinuous Current Mode
Channel 4:LED Current
Channel 1:SW Pin
Channel 2: FB Pin, DC, 200 mV/Div
DC Measurement, 5 V/Div
AC Measurement, 500 mV/Div
OUT
OUT
Condition, No Load
DC Measurement, 100 mA/Div
(DCM), I
DC Measurement, 5 V/Div
F = 250 Hz
OUT
OUT
= 20 mA
Ripple in OVP
TYPICAL OPERATING CHARACTERISTICS
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NCP5050
7
Figure 15. High Frequency Dimming Control,
Figure 11. Continue Current Mode (CCM),
Figure 13. . Startup for 3 LEDs Operating,
Channel 1: CTRL Pin, 5 V/Div, DC Measurement
Channel 2: FB Pin, 200 mV/Div, DC Measurement
Channel 4:LED Current
Channel 1:SW Pin
Channel 4: ILED, 50 mA/Div, t = 10 ms/Div
Channel 3: Input Current, 500 mA/Div
I
Channel 1:CRTL Pin
LEDs
DC Measurement, 200 mA/Div
: 100 mA, R
DC Measurement, 5 V/Div
Channel 2: FB Pin, 200 mV/Div
I
OUT
Channel 3: Input current,
DC Measurement, 5 V/Div
F = 20 kHz
Channel 4: LED Current,
500 mV/Div, t = 50 ms/Div
= 100 mA
sense
200 mA/Div
= 2.5 W