3.0A, 150kHz, Step-Down Switching Regulator
Test Circuit and Layout Guidelines
LM2596
Cin = 470㎌, 50V, Cout = 220㎌, 25V (Aluminum Electrilytic Nichicon "PL Series"
D1 = 5A, 40V Schottky Rectifier, IN5825
L1 = 68uH, L38
Cin = 470㎌, 50V, Cout = 220㎌, 35V (Aluminum Electrilytic Nichicon "PL Series"
D1 = 5A, 40V Schottky Rectifier, IN5825
L1 = 68uH,
R1 = 1㏀, 1%
R2 = R1 x (Vout / Vref - 1)
Figure 2. Typical Test Circuits and Layout Guide
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
switching 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 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 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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HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
