LM2574_15 datasheet(16/34 Pages) TI | LM2574/LM2574HV SIMPLE SWITCHER™ 0.5A Step-Down Voltage Regulator

16 / 34 page

LM2574, LM2574HV

SNVS104C – JUNE 1999 – REVISED APRIL 2013

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PROCEDURE (Adjustable Output Voltage Versions)

EXAMPLE (Adjustable Output Voltage Versions)

4. Catch Diode Selection (D1)

A. The catch-diode current rating must be at least 1.5 times greater A. For this example, a 1A current rating is adequate.

than the maximum load current. Also, if the power supply design B. Use a 50V MBR150 or 11DQ05 Schottky diode, or any of the

must withstand a continuous output short, the diode should have a suggested fast-recovery diodes in Table 2.

current rating equal to the maximum current limit of the LM2574. The

most stressful condition for this diode is an overload or shorted

output condition. Suitable diodes are shown in Table 2.

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

times the maximum input voltage.

5. Input Capacitor (CIN)

An aluminum or tantalum electrolytic bypass capacitor located close A 22

μF aluminum electrolytic capacitor located near the input and

to the regulator is needed for stable operation.

ground pins provides sufficient bypassing. (See Table 2).

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.

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LM2574 Datasheet(PDF) 16 Page - Texas Instruments