LM2597 datasheet(19/34 Pages) NSC

Part #	LM2597

Description	SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator, with Features

PDF	34 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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19 / 34 page

Typical Circuit and Layout Guidelines

Fixed Output Voltage Versions

DS012440-27

Component Values shown are for VIN = 15V, VOUT =5V, ILOAD = 500 mA.

CIN

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

COUT — 120 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”

— 1A, 30V Schottky Rectifier, 1N5818

— 100 µH, L20

Typical Values

CSS

— 0.1 µF

CDELAY — 0.1 µF

RPull Up — 4.7k

*Use Bias Supply pin for 5V and 12V Versions

Adjustable Output Voltage Versions

DS012440-56

Select R1 to be approximately 1 kΩ, use a 1% resistor for best stability.

Component Values shown are for VIN = 20V,

VOUT = 10V, ILOAD = 500 mA.

CIN

— 68 µF, 35V, Aluminum Electrolytic Nichicon “PL Series”

COUT — 120 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”

— 1A, 30V Schottky Rectifier, 1N5818

— 150 µH, L19

—1 k

Ω,1%

— 7.15k, 1%

CFF — 3.3 nF, See Application Information Section

Typical Values

CSS — 0.1 µF

CDELAY — 0.1 µF

RPULL UP — 4.7k

*For output voltages between 4V and 20V

FIGURE 12. Typical Circuits and Layout Guides

LM2597 Datasheet(PDF) 19 Page - National Semiconductor (TI)