NCP5010(2005) Просмотр технического описания (PDF) - ON Semiconductor

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NCP5010
(Rev.:2005)

500 mW Boost Converter for White LEDs

ON Semiconductor 

NCP5010

TYPICAL OPERATING CHARACTERISTICS

3

2

3 LEDs

4 LEDs

1

5 LEDs

0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

VIN (V)

Figure 15. Typical Skip Mode Threshold vs. VIN

(COUT = 1 mF X5R 25 V)

Figure 16. Typical VOUT Ripple in OVP Conditions

1 VOUT, 500 mV/div, AC 3 VOUT, 5 V/div, DC

Figure 17. Continuous Current Mode (CCM)

1 SW, 5 V/div DC, 4 ILED, 50 mA/div, DC, IOUT = 15 mA

Figure 18. Discontinuous Current Mode (DCM)

1 SW, 5 V/div DC, 4 ILED, 50 mA/div, DC, IOUT = 1 mA

Figure 19. Startup for LED Operating, 4 LEDS

RBF = 22 W, 1 CTRL, 2 V/div DC, 2 FB, 500 mV/div DC,

4 IL 100 mA/div, T = 100 ms/div

Figure 20. Duty Cycle Control Waveforms

1 CTRL, 2 V/div DC, 2 FB, 500 mV/div DC,

4 IL 100 mA/div, T = 1 ms/div

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