LM2596 Просмотр технического описания (PDF) - Estek Electronics Co. Ltd
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LM2596 Datasheet PDF : 13 Pages
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TEST CIRCUIT AND LAYOUT GUIDELINES
Fixed Output Voltage Versions
4
+
+ VIN
+3
CIN
52
L1
+
COUT
CIN - 470 F ,50V,Aluminum Electrolytic Nichicon “PL
COUT S- e2r2ie0s”F ,25V,Aluminum Electrolytic Nichicon “PL
Series”D1 - 5A,40V Schottky Rectifer,1N5825
L1 - ,L38
68 H
Adjustable Output Voltage Versions
CFF
R1
R2
4
+
+ VIN
+3
CIN
52
L1
+
COUT
LM2596
L1 +
V
=
R2V
REF
1+( R1 )
where V = REF 1.23V
R = R (2 VOUT -1)
Select R1 to be approximately 1k , use a1% resistor for
sCtIaN bi-lity4. 70 F ,50V,Aluminum Electrolytic Nichicon “PL
COUT S- e2r2ie0s”F ,35V,Aluminum Electrolytic Nichicon “PL
Series”D1 - 5A,40V Schottky Rectifer,1N5825
L1 - ,L38
6R81 H-
1Ck s,ee1%Application Information Section
best
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.
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