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參數(shù)資料
| 型號： | TPS61028DRC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 96% EFFICIENT SYNCHRONOUS BOOST CONVERTER |
| 中文描述： | 96％高效同步升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 16/27頁 |
| 文件大?。?/td> | 498K |
| 代理商： | TPS61028DRC |
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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 TPS6102xs switch is 1800 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)
TPS61020
,
TPS61024
,
TPS61025
TPS61026, TPS61027, TPS61028
TPS61029
SLVS451D–SEPTEMBER 2003–REVISED FEBRUARY 2006
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
. If not used, the LBO pin can be left floating or tied to GND.
For example, for an output current of 200 mA at 3.3 V, at least 920 mA of average current flows through the
inductor at a minimum input voltage of 0.9 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. In typical applications a 6.8 μH inductance is recommended. The device has been
optimized to operate with inductance values between 2.2 μH and 22 μH. Nevertheless operation with higher
inductance values may be possible in some applications. Detailed stability analysis is then recommended. Care
has to be taken that load transients and losses in the circuit can lead to higher currents as estimated in
Equation 5
. 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 TPS6102x converters:
Table 1. List of Inductors
VENDOR
INDUCTOR SERIES
CDRH4D28
CDRH5D28
7447789
744042
B82462-G4
SD25
SD20
Sumida
Wurth Elektronik
EPCOS
Cooper Electronics Technologies
16
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參數(shù)描述 |
|---|---|
| TPS61028DRCR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 800mA Switch 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61028DRCR | 制造商:Texas Instruments 功能描述:DC/DC CONVERTER IC 制造商:Texas Instruments 功能描述:IC, SYNC BOOST CONVERTER, SON-10 |
| TPS61028DRCRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 800mA Switch 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS61029 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:96% EFFICIENT SYNCHRONOUS BOOST CONVERTER |
| TPS61029DRC | 制造商:TI 制造商全稱:Texas Instruments 功能描述:96% EFFICIENT SYNCHRONOUS BOOST CONVERTER |
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