ncp1421 ON Semiconductor, ncp1421 Datasheet - Page 8

• Manufacturer Part Number: ncp1421
• Description: 600 Ma Sync-rect Pfm Step-up Dc-dc Converter Step-up Dc-dc Converter With True-cutoff And Ring-killer
• Manufacturer: ON Semiconductor

Figure 22. Line Transient Response for V
(V
Upper Trace: Output Voltage Ripple, 20 mV/Division
Lower Trace: Voltage at Lx pin, 1.0 V/Division
Figure 24. Load Transient Response For V
(V
Upper Trace: Output Voltage Ripple, 50 mV/Division
Lower Trace: Load Current, I
IN
OUT
(V
Upper Trace: Output Voltage Ripple, 100 mV/Division
Lower Trace: Battery Voltage, V
= 2.5 V, V
Figure 20. Discontinuous Conduction Mode
IN
= 3.3 V, I
= 1.5 V to 2.5 V; L = 5.6 mH, C
OUT
LOAD
= 3.3 V, I
Switching Waveform
= 50 mA to 500 mA; L = 5.6 mH, C
LOAD
LOAD
= 50 mA; L = 5.6 mH, C
, 500 mA/Division
IN,
1.0 V/Division
OUT
= 22mF, I
TYPICAL OPERATING CHARACTERISTICS
LOAD
OUT
OUT
OUT
= 100 mA)
IN
= 22 mF)
= 22 mF)
= 2.5 V
= 3.3 V
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NCP1421
8
Figure 23. Line Transient Response For V
(V
Upper Trace: Output Voltage Ripple, 20 mV/Division
Lower Trace: Voltage at LX pin, 1.0 V/Division
Figure 25. Load Transient Response For V
(V
Upper Trace: Output Voltage Ripple, 100 mV/Division
Lower Trace: Load Current, I
IN
OUT
(V
Upper Trace: Output Voltage Ripple, 100 mV/Division
Lower Trace: Battery Voltage, V
= 2.5 V, V
IN
= 5.0 V, I
Figure 21. Continuous Conduction Mode
= 1.5 V to 2.5 V; L = 5.6 mH, C
OUT
LOAD
= 3.3 V, I
Switching Waveform
= 50 mA to 500 mA; L = 5.6 mH, C
LOAD
LOAD
= 500 mA; L = 5.6 mH, C
, 500 mA/Division
IN,
1.0 V/Division
OUT
= 22mF, I
LOAD
OUT
OUT
= 100 mA)
OUT
IN
= 22 mF)
= 3.0 V
= 22mF)
= 5.0 V