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參數(shù)資料
| 型號： | TPS61090RSA |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | SYNCHRONOUS BOOST CONVERTER WITH 2A SWITCH |
| 中文描述： | 同步升壓轉(zhuǎn)換器具有2A開關(guān) |
| 文件頁數(shù)： | 12/19頁 |
| 文件大?。?/td> | 457K |
| 代理商： | TPS61090RSA |
www.ti.com
R1
R2
VBAT
threshold
VLBI
1
390 k
VBAT
500 mV
1
(3)
Inductor Selection
A boost converter normally requires two main passive components for storing energy during the conversion. A
boost inductor and a storage capacitor at the output are required. To select the boost inductor, it is
recommended to keep the possible peak inductor current below the current limit threshold of the power switch in
the chosen configuration. For example, the current limit threshold of the TPS6109x's switch is 2500 mA at an
output voltage of 5 V. The highest peak current through the inductor and the switch depends on the output load,
the input (V
BAT
), and the output voltage (V
OUT
). Estimation of the maximum average inductor current can be done
using Equation 4:
IL
IOUT
VOUT
VBAT
0.8
(4)
L
VBAT
VOUT–VBAT
VOUT
IL
(5)
TPS61090
TPS61091, TPS61092
SLVS484A–JUNE 2003–REVISED APRIL 2004
APPLICATION INFORMATION (continued)
The output of the low battery supervisor is a simple open-drain output that goes active low if the dedicated
battery voltage drops below the programmed threshold voltage on LBI. The output requires a pullup resistor with
a recommended value of 1 M
. The maximum voltage which is used to pull up the LBO outputs should not
exceed the output voltage of the dc/dc converter. If not used, the LBO pin can be left floating or tied to GND.
For example, for an output current of 500 mA at 5 V, at least 1750 mA of average current flows through the
inductor at a minimum input voltage of 1.8 V.
The second parameter for choosing the inductor is the desired current ripple in the inductor. Normally, it is
advisable to work with a ripple of less than 20% of the average inductor current. A smaller ripple reduces the
magnetic hysteresis losses in the inductor, as well as output voltage ripple and EMI. But in the same way,
regulation time at load changes rises. In addition, a larger inductor increases the total system costs. With those
parameters, it is possible to calculate the value for the inductor by using Equation 5:
Parameter f is the switching frequency and
I
L
is the ripple current in the inductor, i.e., 20%
×
I
L
. In this example,
the desired inductor has the value of 5.5 μH. With this calculated value and the calculated currents, it is possible
to choose a suitable inductor. Care has to be taken that load transients and losses in the circuit can lead to
higher currents as estimated in equation 4. Also, the losses in the inductor caused by magnetic hysteresis losses
and copper losses are a major parameter for total circuit efficiency.
The following inductor series from different suppliers have been used with the TPS6109x converters:
List of Inductors
VENDOR
INDUCTOR SERIES
CDRH6D28
CDRH6D38
CDRH103R
WE-PD type L
WE-PD type XL
B82464G
Sumida
Wurth Elektronik
EPCOS
12
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS61090RSAR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 500-mA 96% Eff Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61090RSARG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 500-mA 96% Eff Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61091 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH 2A SWITCH |
| TPS61091RSA | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH 2A SWITCH |
| TPS61091RSAR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3.3-V Output 500-mA Boost Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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