NCP1550D ON, NCP1550D Datasheet - Page 9

• Manufacturer Part Number: NCP1550D
• Description: 600 kHz PWM/PFM Step-Down DC-DC Controller
• Manufacturer: ON

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 19. Discontinuous Conduction Mode
PFM Switching Waveform for V
Figure 21. Startup Transient Response for
IN
= 5.0 V, I
Upper Trace: Input Voltage, 2.0 V/Division
Lower Trace: Output Voltage, 1.0 V/Division
LOAD
= 30 mA, L = 6.8 mH, C
V
OUT
= 1.8 V
L
, 500 mA/Division
OUT
OUT
= 1.8 V
= 33 mF)
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NCP1550
9
Upper Trace: Output Voltage Waveform, 2.0 V/Division
Lower Trace: Chip Enable/Disable Pin Waveform, 0.5 V/Division
Figure 22. Chip Enable/Disable Output Voltage
Figure 20. Startup Transient Response for
Upper Trace: Input Voltage, 2.0 V/Division
Lower Trace: Output Voltage, 2.0 V/Division
Waveform
V
OUT
= 3.3 V