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LM2596 Datasheet(PDF) 10 Page - Estek Electronics Co. Ltd

No. de pieza LM2596
Descripción Electrónicos  Simple high-efficiency step-down (buck) regulator
Download  12 Pages
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Fabricante Electrónico  ESTEK [Estek Electronics Co. Ltd]
Página de inicio  http://www.estek.com.cn/en/index.asp
Logo ESTEK - Estek Electronics Co. Ltd

LM2596 Datasheet(HTML) 10 Page - Estek Electronics Co. Ltd

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PROCEDURE (Adjustable Output Voltage Version)
EXAMPLE (Adjustable Output Voltage Version)
1)
V
V
(
R
R
REF
OUT
1
2
=
2. Inductor Selection (L1)
2. Inductor Selection (L1)
A. Calculate the inductor Volt • microsecond constant E
•T (V•µs), from
the following formula:
s)
(V
kHz
150
1000
V
V
V
V
V
)
V
V
(V
T
E
D
SAT
IN
D
OUT
SAT
OUT
IN
µ
+
+
=
where VSAT = internal switch saturation voltage = 1.16V
and VD = diode forward voltage drop = 0.5V
A. Calculate the inductor Volt
• microsecond constant
(E
•T),
s)
(V
150
1000
5
.
0
16
.
1
28
5
.
0
20
)
16
.
1
20
28
(
T
E
µ
+
+
=
s)
(V
.
s)
(V
.
.
.
)
.
(
T
E
µ
µ
=
=
2
34
67
6
34
27
5
20
84
6
B. Use the E
•T value from the previous formula and match it with the
E
•T number on the vertical axis of the Inductor Value Selection Guide
shown in Figure 7.
B.
E
•T=34.2 (V•µs)
C. on the horizontal axis, select the maximum load current.
C. ILOAD (max) = 3A
D. Identify the inductance region intersected by the E
•T value and the
Maximum Load Current value. Each region is identified by an
inductance value and an inductor code (LXX).
D. From the inductor value selection guide shown in Figure 7, the
inductance region intersected by the 34 (V
•µs) horizontal line and
the 3A vertical line is 47 µH, and the inductor code is L39.
E. Select an appropriate inductor from the four manufacturer’s part
numbers listed in Figure 8.
E. From the table in Figure 8, locate line L39, and select an
inductor part number from the list of manufacturers part numbers.
3. Output Capacitor Selection (COUT)
3. Output Capacitor SeIection (COUT)
A. In the majority of applications, low ESR electrolytic or solid tantalum
capacitors between 82 µF and 820 µF provide the best results. This capacitor
should be located close to the IC using short capacitor leads and short copper
traces. Do not use capacitors larger than 820 µF.
B. To simplify the capacitor selection procedure, refer to the quick
design table shown in Figure 3. This table contains different output
voltages, and lists various output capacitors that will provide the best
design solutions.
B. From the quick design table shown in Figure 3, locate the output
voltage column. From that column, locate the output voltage closest to the
output voltage in your application. In this example, select the 24V line.
Under the output capacitor section, select a capacitor from the list of
through hole electrolytic or surface mount tantalum types from four
different capacitor manufacturers. It is recommended that both the
manufacturers and the manufacturers series that are listed in the table be
used.
In this example, through hole aluminum electrolytic capacitors from
several different manufacturers are available.
220 µF/35V Panasonic HFQ Series
150 µF/35V Nichicon PL Series
C. The capacitor voltage rating should be at least 1.5 times greater than
the output voltage, and often much higher voltage ratings are needed to
satisfy the low ESR requirements needed for low output ripple voltage.
C. For a 20V output, a capacitor rating of at least 30V or more is
needed. In this example, either a 35V or 50V capacitor would
work. A 35V rating was chosen, although a 50V rating could also
be used if a lower output ripple voltage is needed.
Other manufacturers or other types of capacitors may also be used,
provided the capacitor specifications (especially the 100 kHz
ESR) closely match the types listed in the table. Refer to the
capacitor manufacturers data sheet for this information.
4. Feedforward Capacitor (CFF ) (See Figure 1)
4. Feedforward Capacitor (CFF )
For output voltages greater than approximately 10V, an additional
capacitor is required. The compensation capacitor is typically between
100 pF and 33 nF, and is wired in parallel with the output voltage
setting resistor, R2. It provides additional stability for high output
voltages, low input-output voltages, and/or very low ESR output
capacitors, such as solid tantalum capacitors.
2
FF
R
10
31
1
C
×
×
=
This capacitor type can be ceramic, plastic, silver mica, etc. (Because of
the unstable characteristics of ceramic capacitors made with Z5U
material, they are not recommended.)
The table shown in Figure 3 contains feed forward capacitor
values for various output voltages. In this example, a 560 pF
capacitor is needed.
3
10
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
3AStep-Down VoltageRegulator


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