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LM2599T-3.3 датащи(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LM2599T-3.3
подробное описание детали  SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2599T-3.3 датащи(HTML) 9 Page - National Semiconductor (TI)

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Test Circuit and Layout Guidelines (Continued)
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, the wires indicated by
heavy lines should be wide printed circuit traces and
should be kept as short as possible. For best results, ex-
ternal 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 as-
sociated wiring. Physically locate both resistors near the IC,
and route the wiring away from the inductor, especially an
open core type of inductor. (See application section for more
information.)
Adjustable Output Voltage Versions
DS012582-25
where VREF = 1.23V
Select R1 to be approximately 1 kΩ,usea1% resistor for best stability.
Component Values shown are for VIN = 20V,
VOUT = 10V, ILOAD = 3A.
CIN:
— 470 µF, 35V, Aluminum Electrolytic Nichicon “PL Series”
COUT:
— 220 µF, 35V Aluminum Electrolytic, Nichicon “PL Series”
D1 — 5A, 30V Schottky Rectifier, 1N5824
L1 — 68 µH, L38
R1 —1 kΩ,1%
R2 — 7.15k, 1%
CFF — 3.3 nF, See Application Information Section
RFF —3 kΩ, See Application Information Section
Typical Values
CSS — 0.1 µF
CDELAY — 0.1 µF
RPULL UP — 4.7k
FIGURE 1. Standard Test Circuits and Layout Guides
www.national.com
9


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