ncp1550 ON Semiconductor, ncp1550 Datasheet - Page 7

• 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
(V
Figure 13. Discontinuous Conduction Mode PFM
Figure 11. Continuous Conduction Mode PWM
(V
IN
IN
= 5.0 V, I
= 5.0 V, I
Switching Waveform for V
Switching Waveform for V
LOAD
LOAD
= 500 mA, L = 3.3 mH, C
= 10 mA, L = 3.3 mH, C
L
L
, 500 mA/Division
, 500 mA/Division
OUT
OUT
= 3.3 V
OUT
OUT
= 3.3 V
= 100 mF)
= 100 mF)
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NCP1550
7
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 12. Discontinuous Conduction Mode PWM
IN
IN
Figure 14. Continuous Conduction Mode PWM
= 5.0 V, I
= 5.0 V, I
Switching Waveform for V
Switching Waveform for V
LOAD
LOAD
= 100 mA, L = 3.3 mH, C
= 500 mA, L = 5.6 mH, C
L
L
, 500 mA/Division
, 500 mA/Division
OUT
OUT
OUT
OUT
= 3.3 V
= 2.5 V
= 100 mF)
= 33 mF)