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LM2591HV Datasheet(PDF) 18 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM2591HV
Description  SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2591HV Datasheet(HTML) 18 Page - National Semiconductor (TI)

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Application Information (Continued)
LAYOUT SUGGESTIONS
As in any switching regulator, layout is very important. Rap-
idly switching currents associated with wiring inductance can
generate voltage transients which can cause problems. For
minimal inductance and ground loops, with reference to
Figure 1, 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 induc-
tor. Allowing the inductor flux to intersect sensitive feedback,
lC groundpath and C
OUT 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.
10129342
FIGURE 12. Inverting Regulator Ground Referenced Shutdown
10129386
FIGURE 13. Inverting Regulator Ground Referenced Shutdown using Opto Device
www.national.com
18


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