Datasheet

LM2678
www.ti.com SNVS029I –MARCH 2000–REVISED APRIL 2013
Typical Performance Characteristics (continued)
Discontinuous Mode Switching Waveforms Load Transient Response for Continuous Mode
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 500 mA V
IN
= 20V, V
OUT
= 5V
L = 10 μH, C
OUT
= 400 μF, C
OUT
ESR = 13 mΩ L = 10 μH, C
OUT
= 400 μF, C
OUT
ESR = 13 mΩ
A. V
SW
Pin Voltage, 10 V/div. A. Output Voltage, 100 mV//div, AC-Coupled.
B. Inductor Current, 1 A/div B. Load Current: 500 mA to 5A Load Pulse
C. Output Ripple Voltage, 20 mV/div AC-Coupled
Figure 16. Horizontal Time Base: 1 μs//iv Figure 17. Horizontal Time Base: 100 μs/div
Load Transient Response for Discontinuous Mode
V
IN
= 20V, V
OUT
= 5V, vs
L = 10 μH, C
OUT
= 400 μF, C
OUT
ESR = 13 mΩ
A. Output Voltage, 100 mV/div, AC-Coupled.
B. Load Current: 200 mA to 3A Load Pulse
Figure 18. Horizontal Time Base: 200 μs/div
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