LM2594, LM2594HV

SNVS118C – DECEMBER 1999 – REVISED APRIL 2013

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TYPICAL CIRCUIT AND LAYOUT GUIDELINES

Fixed Output Voltage Versions

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

D1 — 1A, 40V Schottky Rectifier, 1N5819

L1 — 100

μH, L20

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

problems.

10

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