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參數(shù)資料
| 型號： | TPS65171RHAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)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(shù)： | 24/46頁 |
| 文件大?。?/td> | 3644K |
| 代理商： | TPS65171RHAR |
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SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
www.ti.com
Inductor Selection (Buck-Boost Converter)
The buck-boost converter is able to operate with 10mH to 47mH inductors, a 22mH 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 0.8A. Another important parameter is the inductor dc resistance.
Usually the lower the dc resistance the higher the efficiency. The type and core material of the inductor
influences the efficiency as well. The efficiency difference among inductors can vary up to 5%. Possible inductors
are listed in Table 10.
Table 10. Inductor Selection Buck-Boost Converter
INDUCTOR VALUE
COMPONENT SUPPLIER
SIZE (LxWxH mm)
Isat/DCR
22mH
Sumida CDRH3D23/HP
4.0 × 4.0 × 2.5
0.8A/306m
22mH
Sumida CDRH4D22/HP
5.0 × 5.0 × 2.4
1.1A/214m
22mH
Sumida CDH3D13D/SHP
3.2 × 3.2 × 1.5
0.6A/753m
Rectifier Diode Selection (Buck-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 buck-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
(33)
Usually a Schottky diode with a 500mA 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 the average rectified forward
current times the diode forward voltage. The efficiency rises with lower forward voltage.
PD = Iavg × Vforward
(34)
Table 11. Rectifier Diode Selection (Buck-Boost Converter)
Vr/Iavg
Vforward
RqJA
SIZE
COMPONENT SUPPLIER
40V/0.5A
0.43V at 0.5A
206°C/W
SOD-123
MBR0540, Vishay Semiconductor
40V/1A
0.42V at 0.5A
88°C/W
SMA
SS14, Fairchild Semiconductor
Output Capacitor Selection (Buck-Boost Converter)
For the best output voltage filtering, low ESR ceramic capacitors are recommended. One 22mF or two 10mF
output capacitors with sufficient voltage ratings in parallel are adequate for most applications. Additional
capacitors can be added to improve load transient regulation. See Table 12 for output capacitor selection.
Table 12. Output Capacitor Selection (Buck-Boost Converter)
CAPACITOR
COMPONENT SUPPLIER
22mF/25V
Murata, GRM32ER61E226KE15
10mF/25V
Murata, GRM31CR61E106KA12
10mF/50V
Taiyo Yuden, UMK325BJ106MM
Positive Charge Pump Regulator (VONE)
This output rail is required to power the scan driver and is generated with a charge pump doubler stage running
from Vs and using the switch node of the boost converter. The external PNP transistor regulates the output
voltage to the programmed voltage set by the feedback resistor divider. Power dissipation and average collector
current of the transistor must be taken into consideration when choosing a suitable transistor. Also the power
dissipation of the resistor R12 must be considered.
30
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS65171
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