LM2596R-3.3_Datasheet

3.0A, 150kHz, Step-Down Switching Regulator LM2596
Jan. 2015 - Rev. 1.4.2 - 7 - HTC
Test Circuit and Layout Guidelines
C
IN
= 470㎌, 50V, C
OUT
= 220㎌, 25V (Aluminum Electrolytic Nichicon "PL Series"
D1 = 5A, 40V Schottky Rectifier, IN5825
L1 = 68uH, L38
Cin = 470 ㎌, 50V, Cout = 220 ㎌, 35V (Aluminum Electrolytic Nichicon "PL Series"
D1 = 5A, 40V Schottky Rectifier, IN5825
L1 = 68uH, R1 = 1 ㏀, 1%, R2 = R1 x (Vout / Vref - 1)
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
ground path 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.