Datasheet

LM2675
www.ti.com SNVS129E –MAY 2004–REVISED JUNE 2005
Typical Performance Characteristics
(Circuit of Figure 22)
Continuous Mode Switching Waveforms Discontinuous Mode Switching Waveforms
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 1A V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 300 mA
L = 47 μH, C
OUT
= 68 μF, C
OUT
ESR = 50 mΩ L = 15 μH, C
OUT
= 68 μF (2×), C
OUT
ESR = 25 mΩ
A: V
SW
Pin Voltage, 10 V/div. A: V
SW
Pin Voltage, 10 V/div.
B: Inductor Current, 0.5 A/div B: Inductor Current, 0.5 A/div
C: Output Ripple Voltage, 20 mV/div AC-Coupled C: Output Ripple Voltage, 20 mV/div AC-Coupled
Figure 18. Horizontal Time Base: 1 μs/div Figure 19. Horizontal Time Base: 1 μs/div
Load Transient Response for Continuous Mode Load Transient Response for Discontinuous Mode
V
IN
= 20V, V
OUT
= 5V, I
LOAD
= 1A V
IN
= 20V, V
OUT
= 5V,
L = 47 μH, C
OUT
= 68 μF, C
OUT
ESR = 50 mΩ L = 47 μH, C
OUT
= 68 μF, C
OUT
ESR = 50 mΩ
A: Output Voltage, 100 mV/div, AC-Coupled. A: Output Voltage, 100 mV/div, AC-Coupled.
B: Load Current: 200 mA to 1A Load Pulse B: Load Current: 100 mA to 400 mA Load Pulse
Figure 20. Horizontal Time Base: 50 μs/div Figure 21. Horizontal Time Base: 200 μs/div
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