LM2670 datasheet(8/26 Pages) NSC

Part #	LM2670

Description	SIMPLE SWITCHER짰 High Efficiency 3A Step-Down Voltage Regulator with Sync

PDF	26 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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8 / 26 page

Typical Performance Characteristics

Continuous Mode Switching Waveforms

IN = 20V, VOUT = 5V, ILOAD =3A

L=33µH, C

OUT = 200 µF, COUTESR=26m

Ω

Discontinuous Mode Switching Waveforms

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

L=10µH, C

OUT = 400 µF, COUTESR=13m

Ω

10094217

A: VSW Pin Voltage, 10 V/div.

B: Inductor Current, 1 A/div

C: Output Ripple Voltage, 20 mV/div AC-Coupled

Horizontal Time Base: 1 µs/div

10094218

A: VSW Pin Voltage, 10 V/div.

B: Inductor Current, 1 A/div

C: Output Ripple Voltage, 20 mV/div AC-Coupled

Horizontal Time Base: 1 µs//iv

Load Transient Response for Continuous Mode

IN = 20V, VOUT =5V

L=33µH, C

OUT = 200 µF, COUTESR=26m

Ω

Load Transient Response for Discontinuous Mode

IN = 20V, VOUT = 5V,

L=10µH, C

OUT = 400 µF, COUTESR=13m

Ω

10094219

A: Output Voltage, 100 mV//div, AC-Coupled.

B: Load Current: 500 mA to 3A Load Pulse

Horizontal Time Base: 100 µs/div

10094220

A: Output Voltage, 100 mV/div, AC-Coupled.

B: Load Current: 200 mA to 3A Load Pulse

Horizontal Time Base: 200 µs/div

LM2670 Datasheet(PDF) 8 Page - National Semiconductor (TI)