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參數資料
| 型號： | TPS65171RHAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40 |
| 文件頁數： | 15/46頁 |
| 文件大小： | 3644K |
| 代理商： | TPS65171RHAR |
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SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
www.ti.com
Inductor Selection (Boost Converter)
The boost converter is able to operate with 6.8mH to 15mH inductors, a 10mH inductor is typical. The main
parameter for 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. The alternative more conservative approach is to choose an inductor with saturation current at least
as high as the minimum switch current limit of 2.5A. Another important parameter is the inductor dc resistance.
Usually the lower the dc resistance the higher the efficiency. 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. The
efficiency difference among inductors can vary up to 10%. Possible inductors are shown in Table 3.
Table 3. Inductor Selection Boost Converter
INDUCTOR VALUE
COMPONENT SUPLIER
SIZE (L×W×H mm)
Isat/DCR
10 mH
Sumida CDRH5D28R/HP
6.2 × 6.2 × 3.0
2.5 A/74 m
10 mH
Sumida CDRH6D26/HP
7 × 7 × 2.8
2.5 A/72 m
10 mH
Sumida CDRH6D28
7 × 7 × 3.0
1.7 A/48 m
10 mH
Sumida CDRH5D28R
6.2 × 6.3 × 3.0
1.3 A/40 m
Rectifier Diode Selection (Boost Converter)
To achieve high efficiency a Schottky diode should be used. The reverse voltage rating should be higher than the
maximum output voltage of the boost converter. The average rectified forward current Iavg, the Schottky diode
needs to be rated for, is equal to the output current Iout.
Iavg = Iout
(10)
Usually a Schottky diode with 2A maximum average rectified forward current rating is sufficient for most
applications. The Schottky rectifier can be selected with lower forward current capability depending on the output
current Iout, but has to be able to dissipate the power. The dissipated power is calculated according to the the
following equation:
PD = Iavg × Vforward
(11)
Table 4. Rectifier Diode Selection (Boost Converter)
Vr/Iavg
Vforward
RqJA
SIZE
COMPONENT SUPPLIER
20V/2A
0.38V at 2A
60°C/W
PowerDI 123
DFLS220L, DIODES Incorporated
20V/2A
0.44V at 2A
25°C/W
SMA
B220A, DIODES Incorporated
20V/2A
0.44V at 2A
75°C/W
SMB
SL22, Vishay Semiconductor
Output Capacitor Selection (Boost Converter)
For the best output voltage filtering, low ESR ceramic output capacitors are recommended. Two 22mF or four
10mF ceramic output capacitors with sufficient voltage rating in parallel are adequate for most applications.
Additional capacitors can be added to improve the load transient regulation. See Table 5 for output capacitor
selection.
Table 5. Output Capacitor Selection (Boost Converter)
CAPACITOR
COMPONENT SUPPLIER
22mF/25V
Murata, GRM32ER61E226KE15
10mF/25V
Murata, GRM31CR61E106KA12
10mF/50V
Taiyo Yuden, UMK325BJ106MM
22
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS65171
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