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LM2852YMXAX-1.8 Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM2852YMXAX-1.8
Descripción Electrónicos  2A 500/1500kHz Synchronous SIMPLE SWITCHER짰 Buck Regulator
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2852YMXAX-1.8 Datasheet(HTML) 11 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 PVIN
pin, V
OUT is the output voltage of the switcher, f is the
switching frequency and L 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 LM2852.
As an example, consider a 5V to 1.2V conversion and a
500kHz switching frequency. According to Table 1, a 15µH
inductor may be used. Calculating the expected peak-to-
peak ripple,
The maximum inductor current for a 2A load would therefore
be 2A plus 60.8 mA, 2.0608A. As shown in the ripple equa-
tion, the current ripple is inversely proportional to induc-
tance.
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 manufacturer
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 may be suitable in LM2852
applications.
TABLE 2. LM2852 Output Filter Inductors
Inductance (µH)
Part Number
Vendor
1
DO1608C-102
Coilcraft
1
DO1813P-102HC
Coilcraft
6.8
DO3316P-682
Coilcraft
7
MSS1038-702NBC
Coilcraft
10
DO3316P-103
Coilcraft
10
MSS1038-103NBC
Coilcraft
12
MSS1038-123NBC
Coilcraft
15
D03316P-153
Coilcraft
15
MSS1038-153NBC
Coilcraft
18
MSS1038-183NBC
Coilcraft
22
DO3316P-223
Coilcraft
22
MSS1038-223NBC
Coilcraft
22
DO3340P-223
Coilcraft
27
MSS1038-273NBC
Coilcraft
33
MSS1038-333NBC
Coilcraft
33
DO3340P-333
Coilcraft
www.national.com
11


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