lm2678sx-adj National Semiconductor Corporation, lm2678sx-adj Datasheet - Page 8

• Manufacturer Part Number: lm2678sx-adj
• Description: Simple Switcher High Efficiency 5a Step-down Voltage Regulator
• Manufacturer: National Semiconductor Corporation

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Typical Performance Characteristics
A: V
B: Inductor Current, 2 A/div
C: Output Ripple Voltage, 20 mV/div AC-Coupled
A: Output Voltage, 100 mV//div, AC-Coupled.
B: Load Current: 500 mA to 5A Load Pulse
SW
Load Transient Response for Continuous Mode
L = 10 µH, C
Pin Voltage, 10 V/div.
L = 10 µH, C
Continuous Mode Switching Waveforms
V
Horizontal Time Base: 100 µs/div
Horizontal Time Base: 1 µs/div
IN
= 20V, V
V
OUT
OUT
IN
= 20V, V
= 400 µF, C
= 400 µF, C
OUT
= 5V, I
OUT
OUT
OUT
= 5V
LOAD
ESR = 13 mΩ
ESR = 13 mΩ
= 5A
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8
(Continued)
A: V
B: Inductor Current, 1 A/div
C: Output Ripple Voltage, 20 mV/div AC-Coupled
A: Output Voltage, 100 mV/div, AC-Coupled.
B: Load Current: 200 mA to 3A Load Pulse
SW
Load Transient Response for Discontinuous Mode
L = 10 µH, C
Pin Voltage, 10 V/div.
L = 10 µH, C
Discontinuous Mode Switching Waveforms
V
IN
Horizontal Time Base: 200 µs/div
= 20V, V
Horizontal Time Base: 1 µs//iv
V
OUT
OUT
IN
= 20V, V
OUT
= 400 µF, C
= 400 µF, C
= 5V, I
OUT
LOAD
OUT
= 5V,
OUT
ESR = 13 mΩ
ESR = 13 mΩ
= 500 mA
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