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參數(shù)資料
| 型號： | TPS65131RGE |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | POSITIVE AND NEGATIVE OUTPUT DC-DC CONVERTER |
| 中文描述： | 正負(fù)輸出電壓的DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 24/29頁 |
| 文件大小： | 550K |
| 代理商： | TPS65131RGE |
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R3
R4
VREF
VNEG
VREF
1
(2)
Inductor Selection
ILP
VPOS
VIN
VIN
VIN
0.64
IOUTP
(3)
ILN
VNEG
0.64
IOUTN
(4)
LP
VIN
VPOS
fS
VIN
VIN
ILP
VPOS
VNEG
(5)
LN
ILN
fS
VNEG
VIN
(6)
TPS65130, TPS65131
SLVS493B–MARCH 2004–REVISED SEPTEMBER 2004
APPLICATION INFORMATION (continued)
considerations are similar to the considerations at the boost converter. For the same reasons, the feedback
divider current should be in the range of 5 μA or higher. The voltage across R
is 1.213 V. Based on those
values, the recommended value for R
4
should be lower than 200 k
in order to set the divider current at the
required value. The value of the resistor R
3
, depending on the needed output voltage (V
NEG
), can be calculated
using Equation 2:
If as an example an output voltage of –5 V is needed and a resistor of 180 k
has been chosen for R
4
, a 750-k
resistor is needed to program the desired output voltage.
An inductive converter normally requires two main passive components for storing energy during the conversion.
An inductor and a storage capacitor at the output are required. In selecting the right 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 switch for the boost converter and for the inverting
converter, is nominally 800 mA at TPS65130 and 1950 mA at TPS65131. The highest peak current through the
switches and the inductor depend on the output load, the input voltage (V
), and the output voltages (V
,
V
NEG
). Estimation of the peak inductor current in the boost converter can be done using Equation 3. Equation 4
shows the corresponding formula for the inverting converter.
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
losses in the inductor, as well as output voltage ripple and EMI. But in the same way, output voltage regulation
gets slower, causing higher voltage changes at fast load changes. In addition, a larger inductor usually increases
the total system cost. Keeping those parameters in mind, the possible inductor value can be calculated using
Equation 5 for the boost converter and Equation 6 for the inverting converter.
Parameter
f
is the switching frequency and
I
L
is the ripple current in the inductor, i.e., 20% x I
L
. V
IN
is the input
voltage, which is assumed to be at 3.3 V in this example. So, the calculated inductance value for the boost
inductor is 5.1 μH and for the inverting converter inductor is 5.1 μH. With these calculated values and the
calculated currents, it is possible to choose a suitable inductor. In typical applications, a 4.7-μH inductor is
recommended. The device has been optimized to work with inductance values between 3.3 μH and 6.8 μH.
Nevertheless, operation with higher inductance values may be possible in some applications. Detailed stability
analysis is then recommended. Care has to be taken for the possibility that load transients and losses in the
circuit can lead to higher currents as estimated in Equation 3 and Equation 4. Also, the losses caused by
magnetic hysteresis losses and copper losses are a major parameter for total circuit efficiency.
24
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS65131RGER | 功能描述:DC/DC 開關(guān)控制器 Adj Dl Otp Switch Boost DC/DC RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS65131RGERG4 | 功能描述:DC/DC 開關(guān)控制器 Adj Dl Otp Switch Boost DC/DC RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS65131RGET | 功能描述:DC/DC 開關(guān)控制器 Adj Dl Otp Switch Boost DC/DC RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS65131RGET | 制造商:Texas Instruments 功能描述:IC CONV DC/DC POS/NEG 24-QFN |
| TPS65131RGET | 制造商:Texas Instruments 功能描述:DC/DC CONVERTER IC ((NW)) 制造商:Texas Instruments 功能描述:IC, DC/DC CONVERTER, VQFN-24 |
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