Datasheet

LM2594, LM2594HV
SNVS118C –DECEMBER 1999–REVISED APRIL 2013 www.ti.com
TYPICAL CIRCUIT AND LAYOUT GUIDELINES
Fixed Output Voltage Versions
C
IN
— 68 μF, 35V, Aluminum Electrolytic Nichicon “PL Series”
C
OUT
— 120 μF, 25V Aluminum Electrolytic, Nichicon “PL Series”
D1 — 1A, 40V Schottky Rectifier, 1N5819
L1 — 100 μH, L20
Select components with higher voltage ratings for designs using the LM2594HV with an input voltage between
40V and 60V.
Adjustable Output Voltage Versions
C
IN
— 68 μF, 35V, Aluminum Electrolytic Nichicon “PL Series”
C
OUT
— 120 μF, 25V Aluminum Electrolytic, Nichicon “PL Series”
D1 — 1A, 40V Schottky Rectifier, 1N5819
L1 — 100 μH, L20
R
1
— 1 kΩ, 1%
C
FF
— See Application Information Section
Figure 20. Typical 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 C
OUT
wiring can cause
problems.
10 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: LM2594 LM2594HV