OBSOLETE

LM2575EP, LM2575HVEP

www.ti.com

SNVS301B – DECEMBER 2004 – REVISED APRIL 2013

(For Continuous Mode Operation)

PROCEDURE (Adjustable Output Voltage Versions)

EXAMPLE (Adjustable Output Voltage Versions)

4. Catch Diode Selection (D1)

4. Catch Diode Selection (D1)

A. The catch-diode current rating must be at least 1.2 times greater A. For this example, a 3A current rating is adequate.

than the maximum load current. Also, if the power supply design B. Use a 40V MBR340 or 31DQ04 Schottky diode, or any of the

must withstand a continuous output short, the diode should have a suggested fast-recovery diodes in Table 1.

current rating equal to the maximum current limit of the LM2575EP.

The most stressful condition for this diode is an overload or shorted

output. See diode selection guide in Table 1.

B. The reverse voltage rating of the diode should be at least 1.25

times the maximum input voltage.

An aluminum or tantalum electrolytic bypass capacitor located close A 100

μF aluminum electrolytic capacitor located near the input and

to the regulator is needed for stable operation.

ground pins provides sufficient bypassing.

To further simplify the buck regulator design procedure, Texas Instruments is making available computer design

software to be used with the Simple Switcher line of switching regulators. Switchers Made Simple (version 3.3)

is available on a (3½″) diskette for IBM compatible computers from a Texas Instruments sales office in your area.

Table 1. Diode Selection Guide

Schottky

Fast Recovery

1A

3A

1A

3A

20V

1N5817

1N5820

MBR120P

MBR320

SR102

SR302

30V

1N5818

1N5821

MBR130P

MBR330

The following

The following

diodes are all

diodes are all

11DQ03

31DQ03

rated to 100V

rated to 100V

SR103

SR303

11DF1

31DF1

40V

1N5819

IN5822

MUR110

MURD310

MBR140P

MBR340

HER102

HER302

11DQ04

31DQ04

SR104

SR304

50V

MBR150

MBR350

11DQ05

31DQ05

SR105

SR305

60V

MBR160

MBR360

11DQ06

31DQ06

SR106

SR306

Table 2. Inductor Selection by Manufacturer's Part Number

Inductor Code

Inductor Value

L100

100

μH

67127000

PE-92108

RL2444

L150

150

μH

67127010

PE-53113

RL1954

L220

220

μH

67127020

PE-52626

RL1953

L330

330

μH

67127030

PE-52627

RL1952

L470

470

μH

67127040

PE-53114

RL1951

L680

680

μH

67127050

PE-52629

RL1950

H150

150

μH

67127060

PE-53115

RL2445

H220

220

μH

67127070

PE-53116

RL2446

(1)

Schott Corp., (612) 475-1173, 1000 Parkers Lake Rd., Wayzata, MN 55391.

(2)

Pulse Engineering, (619) 674-8100, P.O. Box 12236, San Diego, CA 92112.

(3)

Renco Electronics Inc., (516) 586-5566, 60 Jeffryn Blvd. East, Deer Park, NY 11729.

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