LM1575, LM2575-N, LM2575HV

SNVS106E – MAY 1999 – REVISED APRIL 2013

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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 LM2575. The

most stressful condition for this diode is an overload or shorted

output. See 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, TI 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 TI sales office in your area.

Table 1. Diode Selection Guide

Schottky

Fast Recovery

1A

3A

1A

3A

20V

1N5817

1N5820

MBR120P

MBR320

The following

The following

SR102

SR302

diodes are all

diodes are all

30V

1N5818

1N5821

MBR130P

MBR330

rated to 100V:

rated to 100V:

11DQ03

31DQ03

11DF1

31DF1

SR103

SR303

MUR110

MURD310

HER102

HER302

40V

1N5819

IN5822

MBR140P

MBR340

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

H330

330

μH

67127080

PE-53117

RL2447

H470

470

μH

67127090

PE-53118

RL1961

H680

680

μH

67127100

PE-53119

RL1960

H1000

1000

μH

67127110

PE-53120

RL1959

(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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