SNVS124C – NOVEMBER 1999 – REVISED APRIL 2013
Typical Performance Characteristics (continued)
(Circuit of
Feedback Pin
Bias Current
Continuous Mode Switching Waveforms
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 2A
L = 32
μH,
C
OUT
= 220
μF,
C
OUT
ESR = 50 mΩ
Figure 15.
Discontinuous Mode Switching Waveforms
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 500 mA
L = 10
μH,
C
OUT
= 330
μF,
C
OUT
ESR = 45 mΩ
A: Output Pin Voltage, 10V/div.
B: Inductor Current 1A/div.
C: Output Ripple Voltage, 50 mV/div.
Figure 16. Horizontal Time Base: 2
μs/div.
Load Transient Response for Continuous Mode
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 500 mA to 2A
L = 32
μH,
C
OUT
= 220
μF,
C
OUT
ESR = 50 mΩ
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.5A/div.
C: Output Ripple Voltage, 100 mV/div.
Figure 17. Horizontal Time Base: 2
μs/div.
A: Output Voltage, 100 mV/div. (AC)
B: 500 mA to 2A Load Pulse
Figure 18. Horizontal Time Base: 100
μs/div.
Load Transient Response for Discontinuous Mode
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 500 mA to 2A
L = 10
μH,
C
OUT
= 330
μF,
C
OUT
ESR = 45 mΩ
A: Output Voltage, 100 mV/div. (AC)
B: 500 mA to 2A Load Pulse
Figure 19. Horizontal Time Base: 200
μs/div.
8
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