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LM2574HVM-ADJ Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM2574HVM-ADJ
Descripción Electrónicos  SIMPLE SWITCHER??0.5A Step-Down Voltage Regulator
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2574HVM-ADJ Datasheet(HTML) 10 Page - National Semiconductor (TI)

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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 pos-
sible. Single-point grounding (as indicated) or ground plane
construction 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
DS011394-11
CIN — 22 µF, 75V
Aluminum Electrolytic
COUT — 220 µF, 25V
Aluminum Electrolytic
D1 — Schottky, 11DQ06
L1 — 330 µH, 52627
(for 5V in, 3.3V out, use
100 µH, RL-1284-100)
R1 — 2k, 0.1%
R2 — 6.12k, 0.1%
Adjustable Output Voltage Version
DS011394-12
FIGURE 2.
www.national.com
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