S5ULM2596 Datasheet, PDF (8/8 Pages) SeCoS Halbleitertechnologie GmbH – Simple Switcher Power Converter 150KHz 3A Step-Down Voltage Regulator

Elektronische Bauelemente
S5ULM2596
Simple Switcher Power Converter
150KHz 3A Step-Down Voltage Regulator
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 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 IC 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, IC 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.
S5ELM2596
Cin-- 470uF, 50V, Aluminum Electrolytic
Cout-- 220uF, 25V Aluminum Electrolytic
D1-- 5A, 40V Schottky Rectifer, 1N5825
L1-- 68uH
S5ELM2596
Vout=VREF*(1+R2/R1)
Where VREF=1.23V
R2=R1*(Vout/VREF-1)
Select R1 to be approximately 1k , use a 1% resistor for best stability.
Cin-- 470uF, 50V, Aluminum Electrolytic
Cout-- 220uF, 35V Aluminum Electrolytic
D1-- 5A, 40V Schottky Rectifer, 1N5825
L1-- 68uH
Figure 2 Standard Test Circuits and Layout
Guides
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
Any changing of specification will not be informed individual
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