LM2595 datasheet(17/43 Pages) TI1

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LM2595

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SNVS122C – MAY 1999 – REVISED MAY 2016

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Application Information (continued)

Figure 24. Capacitor ESR vs Capacitor Voltage Rating (Typical Low ESR Electrolytic Capacitor)

Table 1. Output Capacitor and Feedforward Capacitor Selection Table

OUTPUT

VOLTAGE

(V)

THROUGH-HOLE OUTPUT CAPACITOR

SURFACE-MOUNT OUTPUT CAPACITOR

PANASONIC HFQ

SERIES (µF/V)

NICHICON PL

SERIES (µF/V)

FEEDFORWARD

CAPACITOR

AVX TPS

SERIES (µF/V)

SPRAGUE 595D

SERIES (µF/V)

FEEDFORWARD

CAPACITOR

180/25

1.5 nF

100/16

180/16

1.5 nF

120/25

1.5 nF

68/20

120/20

1.5 nF

120/25

1.5 nF

68/20

100/20

1.5 nF

82/35

1 nF

33/25

33/35

220 pF

82/50

1 nF

10/35

33/35

220 pF

9.1.4 Catch Diode

Buck regulators require a diode to provide a return path for the inductor current when the switch turns off. This

must be a fast diode and must be placed close to the LM2595 using short leads and short printed circuit traces.

Because of their very fast switching speed and low forward voltage drop, Schottky diodes provide the best

performance, especially in low output voltage applications (5 V and lower). Ultra-fast recovery, or high-efficiency

rectifiers are also a good choice, but some types with an abrupt turnoff characteristic may cause instability or

EMI problems. Ultra-fast recovery diodes typically have reverse recovery times of 50 ns or less. Rectifiers such

as the 1N5400 series are much too slow and must not be used.

Figure 25. Capacitor ESR Change vs Temperature

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