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LM2852YMXA-3.0 数据表(PDF) 11 Page - Texas Instruments

部件名 LM2852YMXA-3.0
功能描述  LM2852 2A 500/1500kHz Synchronous SIMPLE SWITCHER짰 Buck Regulator
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM2852YMXA-3.0 数据表(HTML) 11 Page - Texas Instruments

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'IL =
500 kHz x 15 PH
1.2V
x
5V
(5V - 1.2V)
= 121.6 mA
'IL =
f x L
D x (VIN - VOUT)
LM2852
www.ti.com
SNVS325D – JANUARY 2005 – REVISED APRIL 2013
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 equation:
where
ΔIL is the peak-to-peak current ripple.
D is the duty cycle VOUT/VIN.
VIN is the input voltage applied to the PVIN pin.
VOUT is the output voltage of the switcher.
f is the switching frequency.
L is the inductance of the output filter inductor.
(3)
Knowing the current ripple is important for inductor selection since the peak current through the inductor 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,
(4)
The maximum inductor current for a 2A load would therefore be 2A plus 60.8 mA, 2.0608A. 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 (Isat) 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 Isat of an inductor used in an application should
be greater than the maximum expected inductor current to avoid saturation. Below 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
Copyright © 2005–2013, Texas Instruments Incorporated
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