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LM2574 Datasheet(PDF) 16 Page - Texas Instruments

Part No. LM2574
Description  LM2574/LM2574HV SIMPLE SWITCHER™ 0.5A Step-Down Voltage Regulator
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

LM2574 Datasheet(HTML) 16 Page - Texas Instruments

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LM2574, LM2574HV
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 1.5 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)
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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Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: LM2574 LM2574HV

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