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LM2853MH-0.8 Folha de dados(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM2853MH-0.8
Descrição Electrónicos  3A 550 kHz Synchronous SIMPLE SWITCHER Buck Regulator
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2853MH-0.8 Folha de dados(HTML) 9 Page - National Semiconductor (TI)

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Applications Information (Continued)
CHOOSING AN INDUCTANCE VALUE
The current ripple present in the output filter inductor is
determined by the input voltage, output voltage, switching
frequency and inductance according to the following equa-
tion:
where
∆I
L is the peak to peak current ripple, D is the duty
cycle V
OUT/VIN,VIN is the input voltage applied to the output
stage, V
OUT is the output voltage of the switcher, f is the
switching frequency and L
O is the inductance of the output
filter inductor. Knowing the current ripple is important for
inductor selection since the peak current through the induc-
tor is the load current plus one half the ripple current. Care
must be taken to ensure the peak inductor current does not
reach a level high enough to trip the current limit circuitry of
the LM2853. As an example, consider a 5V to 1.2V conver-
sion and a 550 kHz switching frequency. According to Table
1, a 4.7 µH inductor may be used. Calculating the expected
peak-to-peak ripple,
The maximum inductor current for a 3A load would therefore
be 3A plus 177 mA, 3.177A. As shown in the ripple equation,
the current ripple is inversely proportional to inductance.
OUTPUT FILTER INDUCTORS
Once the inductance value is chosen, the key parameter for
selecting the output filter inductor is its saturation current
(I
SAT) specification. Typically ISAT is given by the manufac-
turer as the current at which the inductance of the coil falls to
a certain percentage of the nominal inductance. The I
SAT of
an inductor used in an application should be greater than the
maximum expected inductor current to avoid saturation. Be-
low is a table of inductors that are suitable in LM2853
applications.
TABLE 2. Recommended Inductors
Inductance
Part Number
Vendor
4.7 µF
DO3308P-472ML
Coilcraft
4.7 µF
DO3316P-472ML
Coilcraft
4.7 µF
MSS1260-472ML
Coilcraft
5.2 µF
MSS1038-522NL
Coilcraft
5.6 µF
MSS1260-562ML
Coilcraft
6.8 µF
DO3316P-682ML
Coilcraft
6.8 µF
MSS1260-682ML
Coilcraft
OUTPUT FILTER CAPACITORS
The recommended capacitors that may be used in the output
filter with the LM2853 are limited in value and ESR range
according to Table 1.
Below are some examples of capacitors that can typically be
used in an LM2853 application.
TABLE 3. Recommended Capacitors
Capacitance (µF)
Part Number
Chemistry
Vendor
100
594D107X_010C2T
Tantalum
Vishay-Sprague
100
593D107X_010D2_E3
Tantalum
Vishay-Sprague
100
TPSC107M006#0075
Tantalum
AVX
100
NOSD107M006#0080
Niobium Oxide
AVX
100
NOSC107M004#0070
Niobium Oxide
AVX
120
594D127X_6R3C2T
Tantalum
Vishay-Sprague
150
594D157X_010C2T
Tantalum
Vishay-Sprague
150
595D157X_010D2T
Tantalum
Vishay-Sprague
150
591D157X_6R3C2_20H
Tantalum
Vishay-Sprague
150
TPSD157M006#0050
Tantalum
AVX
150
TPSC157M004#0070
Tantalum
AVX
150
NOSD157M006#0070
Niobium Oxide
AVX
220
594D227X_6R3D2T
Tantalum
Vishay-Sprague
220
591D227X_6R3D2_20H
Tantalum
Vishay-Sprague
220
591D227X_010D2_20H
Tantalum
Vishay-Sprague
220
593D227X_6R3D2_E3
Tantalum
Vishay-Sprague
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