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NCP1550 Datasheet(PDF) 8 Page - ON Semiconductor

Part # NCP1550
Description  600 kHz PWM/PFM Step?묭own DC?묭C Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1550 Datasheet(HTML) 8 Page - ON Semiconductor

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NCP1550
http://onsemi.com
8
Figure 15. Discontinuous Conduction Mode PWM
Switching Waveform for VOUT = 2.5 V
Upper Trace: Output Voltage Ripple, 50 mV/Division
Middle Trace: Inductor Current, IL, 500 mA/Division
Lower Trace: Voltage at Cathode of Schottky Diode, 2.0 V/Division
(VIN = 5.0 V, ILOAD = 100 mA, L = 5.6 mH, COUT = 33 mF)
Figure 16. Discontinuous Conduction Mode PFM
Switching Waveform for VOUT = 2.5 V
Upper Trace: Output Voltage Ripple, 50 mV/Division
Middle Trace: Inductor Current, IL, 500 mA/Division
Lower Trace: Voltage at Cathode of Schottky Diode, 2.0 V/Division
(VIN = 5.0 V, ILOAD = 30 mA, L = 5.6 mH, COUT = 33 mF)
Figure 17. Continuous Conduction Mode
PWM Switching Waveform for VOUT = 1.8 V
Upper Trace: Output Voltage Ripple, 50 mV/Division
Middle Trace: Inductor Current, IL, 500 mA/Division
Lower Trace: Voltage at Cathode of Schottky Diode, 2.0 V/Division
(VIN = 5.0 V, ILOAD = 500 mA, L = 6.8 mH, COUT = 33 mF)
Figure 18. Discontinuous Conduction Mode
PWM Switching Waveform for VOUT = 1.8 V
Upper Trace: Output Voltage Ripple, 50 mV/Division
Middle Trace: Inductor Current, IL, 500 mA/Division
Lower Trace: Voltage at Cathode of Schottky Diode, 2.0 V/Division
(VIN = 5.0 V, ILOAD = 60 mA, L = 6.8 mH, COUT = 33 mF)


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