LM2597, LM2597HV
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SNVS119C –MARCH 1998–REVISED APRIL 2013
Typical Performance Characteristics (continued)
Continuous Mode Switching Waveforms
VIN = 20V, VOUT = 5V, ILOAD = 400 mA
L = 100 μH, COUT = 120 μF, COUT ESR = 140 mΩ
Discontinuous Mode Switching Waveforms
VIN = 20V, VOUT = 5V, ILOAD = 200 mA
L = 33 μH, COUT = 220 μF, COUT ESR = 60 mΩ
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.2A/div.
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.2A/div.
C: Output Ripple Voltage, 20 mV/div.
C: Output Ripple Voltage, 20 mV/div.
Figure 22. Horizontal Time Base: 2 μs/div.
Figure 23. Horizontal Time Base: 2 μs/div.
Load Transient Response for Continuous Mode
VIN = 20V, VOUT = 5V, ILOAD = 200 mA to 500 mA
L = 100 μH, COUT = 120 μF, COUT ESR = 140 mΩ
Load Transient Response for Discontinuous Mode
VIN = 20V, VOUT = 5V, ILOAD = 100 mA to 200 mA
L = 33 μH, COUT = 220 μF, COUT ESR = 60 mΩ
A: Output Voltage, 50 mV/div. (AC)
B: 100 mA to 200 mA Load Pulse
A: Output Voltage, 50 mV/div. (AC)
B: 200 mA to 500 mA Load Pulse
Figure 24. Horizontal Time Base: 50 μs/div.
Figure 25. Horizontal Time Base: 200 μs/div.
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