ncp1550 ON Semiconductor, ncp1550 Datasheet - Page 8

• Manufacturer Part Number: ncp1550
• Description: 600 Khz Pwm/pfm Stepdown Dcdc Controller
• Manufacturer: ON Semiconductor

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