LM2596 Просмотр технического описания (PDF) - First Components International
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LM2596
First Components International
LM2596 Datasheet PDF : 14 Pages
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LM2596 Simple switcher Power Converter 150kHz
3A Step-Down Voltage Regulator
TEST CIRCUIT AND LAYOUT GUIDELINES
Fixed Output Voltage Versions
4
+
+VIN
+3
CIN
52
L1
+
COUT
L1 +
CIN - 470µF,50V,Aluminum Electrolytic Nichicon œPL SeriesB
COUT - 220µF,25V,Aluminum Electrolytic Nichicon œPL SeriesB
D1 - 5A,40V Schottky Rectifer,1N5825
L1 - 68µH,L38
Adjustable Output Voltage Versions
CFF
R1
R2
4
+
+VIN
+3
CIN
52
L1 +
COUT
V =V OUT
REF
(1
+
R2
R1
)
where VREF=1.23V
R2=
R1(
VOUT
VREF
-1)
Select R1 to be approximately 1kΩ,use a 1% resistor for best stability.
CIN - 470µF,50V,Aluminum Electrolytic Nichicon œPL SeriesB
COUT - 220µF,35V,Aluminum Electrolytic Nichicon œPL SeriesB
D1 - 5A,40V Schottky Rectifer,1N5825
L1 - 68µH,L38
R1 - 1kΩ,1%
CFF - see Application Information Section
Figure 1. Standard Test Circuits and Layout Guides
As in any switching regulator, layout is very important. Rapidly 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, external 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 inductor. Allowing the inductor flux to intersect sensitive feedback, lC groundpath and COUT wiring
can cause problems.
When using the adjustable version, special care must be taken as to the location of the feedback resistors
and the associated wiring. Physically locate both resistors near the IC, and route the wiring away from the
inductor, especially an open core type of inductor.
7
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