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LM2594M-3.3 数据表(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部件名 LM2594M-3.3
功能描述  SIMPLE SWITCHER Power Converter 150 kHz 0.5A Step-Down Voltage Regulator
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM2594M-3.3 数据表(HTML) 8 Page - National Semiconductor (TI)

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Typical Circuit and Layout Guidelines
As in any switching regulator, layout is very important. Rap-
idly switching currents associated with wiring inductance can
generate voltage transients which can cause problems. For
minimal inductance and ground loops, the wires indicated by
heavy lines should be wide printed circuit traces and
should be kept as short as possible. For best results, ex-
ternal components should be located as close to the
switcher lC as possible using ground plane construction or
single point grounding.
If open core inductors are used, special care must be
taken as to the location and positioning of this type of induc-
tor. Allowing the inductor flux to intersect sensitive feedback,
lC groundpath and C
OUT wiring can cause problems.
When using the adjustable version, special care must be
taken as to the location of the feedback resistors and the as-
sociated wiring. Physically locate both resistors near the IC,
and route the wiring away from the inductor, especially an
open core type of inductor. (See application section for more
information.)
Fixed Output Voltage Versions
DS012439-22
CIN — 68 µF, 35V, Aluminum Electrolytic Nichicon “PL Series”
COUT — 120 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”
D1 — 1A, 40V Schottky Rectifier, 1N5819
L1 — 100 µH, L20
Select components with higher voltage ratings for designs using the LM2594HV with an input voltage between 40V and 60V.
Adjustable Output Voltage Versions
DS012439-23
CIN — 68 µF, 35V, Aluminum Electrolytic Nichicon “PL Series”
COUT — 120 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”
D1 — 1A, 40V Schottky Rectifier, 1N5819
L1 — 100 µH, L20
R1 —1 kΩ,1%
CFF — See Application Information Section
FIGURE 1. Typical Circuits and Layout Guides
www.national.com
8


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