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LM2675 Datasheet(PDF) 11 Page - Texas Instruments

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Part No. LM2675
Description  LM2675 SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM2675 Datasheet(HTML) 11 Page - Texas Instruments

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LM2675
www.ti.com
SNVS129E – MAY 2004 – REVISED JUNE 2005
LM2675 Series Buck Regulator Design Procedure (Fixed Output)
PROCEDURE (Fixed Output Voltage Version)
EXAMPLE (Fixed Output Voltage Version)
To simplify the buck regulator design procedure, Texas Instruments
is making available computer design software to be used with the
SIMPLE SWITCHERline of switching regulators.LM267X Made
Simpleversion 6.0 is available on Windows® 3.1, NT, or 95 operating
systems.
Given:
Given:
VOUT = Regulated Output Voltage (3.3V, 5V, or 12V)
VOUT = 5V
VIN(max) = Maximum DC Input Voltage
VIN(max) = 12V
ILOAD(max) = Maximum Load Current
ILOAD(max) = 1A
1. Inductor Selection (L1)
1. Inductor Selection (L1)
A. Select the correct inductor value selection guide from Figure 24,
A. Use the inductor selection guide for the 5V version shown in
Figure 25 or Figure 26 (output voltages of 3.3V, 5V, or 12V
Figure 25.
respectively). For all other voltages, see the design procedure for the
adjustable version.
B. From the inductor value selection guide, identify the inductance
B. From the inductor value selection guide shown in Figure 25, the
region intersected by the Maximum Input Voltage line and the
inductance region intersected by the 12V horizontal line and the 1A
Maximum Load Current line. Each region is identified by an
vertical line is 33
μH, and the inductor code is L23.
inductance value and an inductor code (LXX).
C. Select an appropriate inductor from the four manufacturer's part
C. The inductance value required is 33
μH. From the table in
numbers listed in Inductor Value Selection Guides. Each
Table 1, go to the L23 line and choose an inductor part number from
manufacturer makes a different style of inductor to allow flexibility in
any of the four manufacturers shown. (In most instances, both
meeting various design requirements. Listed below are some of the
through hole and surface mount inductors are available.)
differentiating characteristics of each manufacturer's inductors:
Schott: ferrite EP core inductors; these have very low leakage
magnetic fields to reduce electro-magnetic interference (EMI) and
are the lowest power loss inductors
Renco: ferrite stick core inductors; benefits are typically lowest cost
inductors and can withstand E•T and transient peak currents above
rated value. Be aware that these inductors have an external
magnetic field which may generate more EMI than other types of
inductors.
Pulse: powered iron toroid core inductors; these can also be low cost
and can withstand larger than normal E•T and transient peak
currents. Toroid inductors have low EMI.
Coilcraft: ferrite drum core inductors; these are the smallest physical
size inductors, available only as SMT components. Be aware that
these inductors also generate EMI—but less than stick inductors.
Complete specifications for these inductors are available from the
respective manufacturers. A table listing the manufacturers' phone
numbers is located in Table 2.
2. Output Capacitor Selection (COUT)
2. Output Capacitor Selection (COUT)
A. Select an output capacitor from the output capacitor table in
A. Use the 5.0V section in the output capacitor table in Table 3.
Table 3. Using the output voltage and the inductance value found in
Choose a capacitor value and voltage rating from the line that
the inductor selection guide, step 1, locate the appropriate capacitor
contains the inductance value of 33
μH. The capacitance and
value and voltage rating.
voltage rating values corresponding to the 33
μH inductor are the:
The capacitor list contains through-hole electrolytic capacitors from
Surface Mount:
four different capacitor manufacturers and surface mount tantalum
68
μF/10V
Sprague 594D Series.
capacitors from two different capacitor manufacturers. It is
100
μF/10V
AVX TPS Series.
recommended that both the manufacturers and the manufacturer's
Through Hole:
series that are listed in the table be used. A table listing the
68
μF/10V
Sanyo OS-CON SA Series.
manufacturers' phone numbers is located in Table 2.
220
μF/35V
Sanyo MV-GX Series.
220
μF/35V
Nichicon PL Series.
220
μF/35V
Panasonic HFQ Series.
Copyright © 2004–2005, Texas Instruments Incorporated
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