參數(shù)資料
型號(hào)： TPS61087DSCR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 4.8 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： GREEN, PLASTIC, SON-10
文件頁(yè)數(shù)： 2/30頁(yè)
文件大小： 964K
代理商： TPS61087DSCR
2
-
0.35
IN
S
IN
S
out
S
V
L
V
I
f
h
=
×
÷
÷
÷
×
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SLVS821B – MAY 2008 – REVISED MARCH 2010
www.ti.com
Inductor Selection
The TPS61087 is designed to work with a wide range of inductors. The main parameter for the inductor selection
is the saturation current of the inductor which should be higher than the peak switch current as calculated in the
Design Procedure section with additional margin to cover for heavy load transients. An alternative, more
conservative, is to choose an inductor with a saturation current at least as high as the maximum switch current
limit of 4.8 A. The other important parameter is the inductor DC resistance. Usually the lower the DC resistance
the higher the efficiency. It is important to note that the inductor DC resistance is not the only parameter
determining the efficiency. Especially for a boost converter where the inductor is the energy storage element, the
type and core material of the inductor influences the efficiency as well. At high switching frequencies of 1.2 MHz
inductor core losses, proximity effects and skin effects become more important. Usually an inductor with a larger
form factor gives higher efficiency. The efficiency difference between different inductors can vary between 2% to
10%. For the TPS61087, inductor values between 3 mH and 6 mH are a good choice with a switching frequency
of 1.2 MHz, typically 3.3 mH. At 650 kHz we recommend inductors between 6 mH and 13 mH, typically 6.8 mH.
Possible inductors are shown in Table 1.
Typically, it is recommended that the inductor current ripple is below 35% of the average inductor current.
Therefore, the following equation can be used to calculate the inductor value, L:
(5)
with
VIN
Minimum input voltage
VS
Output voltage
Iout
Maximum output current in the application
fS
Converter switching frequency (typically 1.2 MHz or 650 kHz)
h
Estimated converter efficiency (please use the number from the efficiency plots or 90% as an estimation)
Table 1. Inductor Selection
L
COMPONENT
SIZE
DCR TYP
SUPPLIER
Isat (A)
CODE
(mH)
(L×W×H mm)
(m
)
1.2 MHz
4.2
Sumida
CDRH5D28
5.7 × 5.7 × 3
23
2.2
4.7
Wurth Elektronik
7447785004
5.9 × 6.2 × 3.3
60
2.5
5
Coilcraft
MSS7341
7.3 × 7.3 × 4.1
24
2.9
5
Sumida
CDRH6D28
7 × 7 × 3
23
2.4
4.6
Sumida
CDR7D28
7.6 × 7.6 × 3
38
3.15
4.7
Wurth Elektronik
7447789004
7.3 × 7.3 × 3.2
33
3.9
3.3
Wurth Elektronik
7447789003
7.3 × 7.3 × 3.2
30
4.2
650 kHz
10
Wurth Elektronik
744778910
7.3 × 7.3 × 3.2
51
2.2
10
Sumida
CDRH8D28
8.3 × 8.3 × 3
36
2.7
6.8
Sumida
CDRH6D26HPNP
7 × 7 × 2.8
52
2.9
6.2
Sumida
CDRH8D58
8.3 × 8.3 × 6
25
3.3
10
Coilcraft
DS3316P
12.95 × 9.40 ×
80
3.5
5.08
10
Sumida
CDRH8D43
8.3 × 8.3 × 4.5
29
4
6.8
Wurth Elektronik
74454068
12.7 × 10 × 4.9
55
4.1
10
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS61087
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