LM2675
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SNVS129E –MAY 2004–REVISED JUNE 2005
Typical Performance Characteristics
(Circuit of Figure 22)
Continuous Mode Switching Waveforms
VIN = 20V, VOUT = 5V, ILOAD = 1A
L = 47 μH, COUT = 68 μF, COUTESR = 50 mΩ
Discontinuous Mode Switching Waveforms
VIN = 20V, VOUT = 5V, ILOAD = 300 mA
L = 15 μH, COUT = 68 μF (2×), COUTESR = 25 mΩ
A: VSW Pin Voltage, 10 V/div.
B: Inductor Current, 0.5 A/div
A: VSW Pin Voltage, 10 V/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
VIN = 20V, VOUT = 5V, ILOAD = 1A
L = 47 μH, COUT = 68 μF, COUTESR = 50 mΩ
Load Transient Response for Discontinuous Mode
VIN = 20V, VOUT = 5V,
L = 47 μH, COUT = 68 μF, COUTESR = 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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