LM2576HVSX-3.3 datasheet(11/37 Pages) TI1

Nome de Peças	LM2576HVSX-3.3

Descrição Electrónicos	LM2576/LM2576HV Series SIMPLE SWITCHER짰 3A Step-Down Voltage Regulator

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Fabricante Electrônico	TI1 [Texas Instruments]

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LM2576, LM2576HV

www.ti.com

SNVS107C – JUNE 1999 – REVISED APRIL 2013

TEST CIRCUIT AND LAYOUT GUIDELINES

As in any switching regulator, layout is very important. Rapidly 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 construction should be used for best results. When using the Adjustable version,

physically locate the programming resistors near the regulator, to keep the sensitive feedback wiring short.

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%

Figure 21. Fixed Output Voltage Versions

where

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

Figure 22. Adjustable Output Voltage Version

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