3.0A, 150kHz, Step-Down Switching Regulator

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

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

Test Circuit and Layout Guidelines