lm2596sx-12 National Semiconductor Corporation, lm2596sx-12 Datasheet - Page 8

• Manufacturer Part Number: lm2596sx-12
• Description: Simple Switcher Power Converter 150 Khz 3a Step-down Voltage Regulator
• Manufacturer: National Semiconductor Corporation

www.national.com
Typical Performance Characteristics
A: Output Pin Voltage, 10V/div.
B: Inductor Current 1A/div.
C: Output Ripple Voltage, 50 mV/div.
A: Output Voltage, 100 mV/div. (AC)
B: 500 mA to 2A Load Pulse
Test Circuit and Layout Guidelines
C
C
D1
L1
IN
OUT
— 68 µH, L38
— 5A, 40V Schottky Rectifier, 1N5825
Load Transient Response for Continuous Mode
— 470 µF, 50V, Aluminum Electrolytic Nichicon “PL Series”
L = 32 µH, C
L = 32 µH, C
— 220 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”
V
IN
Continuous Mode Switching Waveforms
= 20V, V
Horizontal Time Base: 100 µs/div.
V
Horizontal Time Base: 2 µs/div.
IN
= 20V, V
OUT
OUT
OUT
= 220 µF, C
= 220 µF, C
= 5V, I
OUT
= 5V, I
LOAD
OUT
OUT
LOAD
= 500 mA to 2A
ESR = 50 m
ESR = 50 m
= 2A
Fixed Output Voltage Versions
01258317
01258319
8
A: Output Pin Voltage, 10V/div.
B: Inductor Current 0.5A/div.
C: Output Ripple Voltage, 100 mV/div.
A: Output Voltage, 100 mV/div. (AC)
B: 500 mA to 2A Load Pulse
Load Transient Response for Discontinuous Mode
L = 10 µH, C
L = 10 µH, C
V
Discontinuous Mode Switching Waveforms
IN
V
= 20V, V
IN
Horizontal Time Base: 200 µs/div.
Horizontal Time Base: 2 µs/div.
= 20V, V
OUT
OUT
OUT
OUT
= 330 µF, C
= 330 µF, C
= 5V, I
= 5V, I
LOAD
LOAD
OUT
OUT
= 500 mA to 2A
= 500 mA
ESR = 45 m
ESR = 45 m
01258322
01258318
01258320