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LM2674 Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM2674
Description  SIMPLE SWITCHER Power Converter High Efficiency 500 mA Step-Down Voltage Regulator
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2674 Datasheet(HTML) 8 Page - National Semiconductor (TI)

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Typical Performance
Characteristics (Circuit of Figure 2)
Continuous Mode Switching Waveforms
V
IN = 20V, VOUT = 5V, ILOAD = 500 mA
L = 100 µH, C
OUT = 100 µF, COUTESR = 0.1
Ω
Discontinuous Mode Switching Waveforms
V
IN = 20V, VOUT = 5V, ILOAD = 300 mA
L=15µH, C
OUT = 68 µF (2x), COUTESR=25m
Ω
10004118
A: VSW Pin Voltage, 10 V/div.
B: Inductor Current, 0.2 A/div
C: Output Ripple Voltage, 50 mV/div AC-Coupled
Horizontal Time Base: 1 µs/div
10004119
A: VSW Pin Voltage, 10 V/div.
B: Inductor Current, 0.5 A/div
C: Output Ripple Voltage, 20 mV/div AC-Coupled
Horizontal Time Base: 1 µs/div
Load Transient Response for Continuous Mode
V
IN = 20V, VOUT = 5V,
L = 100 µH, C
OUT = 100 µF, COUTESR = 0.1
Ω
Load Transient Response for Discontinuous Mode
V
IN = 20V, VOUT = 5V,
L=47µH, C
OUT = 68 µF, COUTESR=50m
Ω
10004120
A: Output Voltage, 100 mV/div, AC-Coupled.
B: Load Current: 100 mA to 500 mA Load Pulse
Horizontal Time Base: 50 µs/div
10004121
A: Output Voltage, 100 mV/div, AC-Coupled.
B: Load Current: 100 mA to 400 mA Load Pulse
Horizontal Time Base: 200 µs/div
www.national.com
8


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