LM2596 datasheet(8/31 Pages) NSC

8 / 31 page

Typical Performance Characteristics

Continuous Mode Switching Waveforms

IN = 20V, VOUT = 5V, ILOAD =2A

L = 32 µH, C

OUT = 220 µF, COUT ESR=50 mΩ

Discontinuous Mode Switching Waveforms

IN = 20V, VOUT = 5V, ILOAD = 500 mA

L = 10 µH, C

OUT = 330 µF, COUT ESR=45 mΩ

01258317

Horizontal Time Base: 2 µs/div.

A: Output Pin Voltage, 10V/div.

B: Inductor Current 1A/div.

C: Output Ripple Voltage, 50 mV/div.

01258318

Horizontal Time Base: 2 µs/div.

A: Output Pin Voltage, 10V/div.

B: Inductor Current 0.5A/div.

C: Output Ripple Voltage, 100 mV/div.

Load Transient Response for Continuous Mode

IN = 20V, VOUT = 5V, ILOAD = 500 mA to 2A

L = 32 µH, C

OUT = 220 µF, COUT ESR=50 mΩ

Load Transient Response for Discontinuous Mode

IN = 20V, VOUT = 5V, ILOAD = 500 mA to 2A

L = 10 µH, C

OUT = 330 µF, COUT ESR=45 mΩ

01258319

Horizontal Time Base: 100 µs/div.

A: Output Voltage, 100 mV/div. (AC)

B: 500 mA to 2A Load Pulse

01258320

Horizontal Time Base: 200 µs/div.

A: Output Voltage, 100 mV/div. (AC)

B: 500 mA to 2A Load Pulse

Test Circuit and Layout Guidelines

Fixed Output Voltage Versions

01258322

CIN

— 470 µF, 50V, Aluminum Electrolytic Nichicon “PL Series”

COUT

— 220 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”

— 5A, 40V Schottky Rectifier, 1N5825

— 68 µH, L38

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