LM2576T-12 datasheet(10/24 Pages) NSC

부품명	LM2576T-12

상세설명	SIMPLE SWITCHER 3A Step-Down Voltage Regulator

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제조업체	NSC [National Semiconductor (TI)]

홈페이지	http://www.national.com

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10 / 24 page

Test Circuit and Layout Guidelines

As in any switching regulator, layout is very important. Rap-

idly switching currents associated with wiring inductance

generate voltage transients which can cause problems. For

minimal inductance and ground loops, the length of the leads

indicated by heavy lines should be kept as short as possible.

Single-point grounding (as indicated) or ground plane con-

struction should be used for best results. When using the

Adjustable version, physically locate the programming resis-

tors near the regulator, to keep the sensitive feedback wiring

short.

Fixed Output Voltage Versions

01147607

CIN — 100 µF, 75V, Aluminum Electrolytic

COUT — 1000 µF, 25V, Aluminum Electrolytic

D1 — Schottky, MBR360

L1 — 100 µH, Pulse Eng. PE-92108

R1 — 2k, 0.1%

R2 — 6.12k, 0.1%

Adjustable Output Voltage Version

01147608

where VREF = 1.23V, R1 between 1k and 5k.

FIGURE 2.

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