SNVS118C – DECEMBER 1999 – REVISED APRIL 2013
Typical Performance Characteristics
Continuous Mode Switching Waveforms
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 400 mA
L = 100
μH,
C
OUT
= 120
μF,
C
OUT
ESR = 140 mΩ
Discontinuous Mode Switching Waveforms
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 200 mA
L = 33
μH,
C
OUT
= 220
μF,
C
OUT
ESR = 60 mΩ
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.2A/div.
C: Output Ripple Voltage, 20 mV/div.
Figure 16. Horizontal Time Base: 2
μs/div.
Load Transient Response for Continuous Mode
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 200 mA to 500 mA
L = 100
μH,
C
OUT
= 120
μF,
C
OUT
ESR = 140 mΩ
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.2A/div.
C: Output Ripple Voltage, 20 mV/div.
Figure 17. Horizontal Time Base: 2
μs/div.
Load Transient Response for Discontinuous Mode
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 100 mA to 200 mA
L = 33
μH,
C
OUT
= 220
μF,
C
OUT
ESR = 60 mΩ
A: Output Voltage, 50 mV/div. (AC)
B: 200 mA to 500 mA Load Pulse
Figure 18. Horizontal Time Base: 50
μs/div.
A: Output Voltage, 50 mV/div. (AC)
B: 100 mA to 200 mA Load Pulse
Figure 19. Horizontal Time Base: 200
μs/div.
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9
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