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參數(shù)資料
| 型號(hào)： | 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)： | 25/29頁 |
| 文件大?。?/td> | 550K |
| 代理商： | TPS65131RGE |
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www.ti.com
Capacitor Selection
CminP
IOUTP
fS
VPOS
VP
IOUTN
VIN
VPOS
VNEG
(7)
CminN
fS
VN
VNEG
VIN
(8)
VESRP
VESRN
IOUTP
IOUTN
RESRP
RESRN
(9)
(10)
TPS65130, TPS65131
SLVS493B–MARCH 2004–REVISED SEPTEMBER 2004
APPLICATION INFORMATION (continued)
The following inductor series from different suppliers have been used with the TPS65130/1 converter:
List of Inductors
VENDOR
INDUCTOR SERIES
B8246284-G4
7447789XXX
744031XXX
VLF3010
VLF4012
SD12
EPCOS
Wurth Elektronik
TDK
Cooper Electronics Technologies
Input Capacitor
At least a 4.7-μF input capacitor is recommended for the input of the boost converter (INP) and for the input of
the inverting converter (INN) to improve transient behavior of the regulators and EMI behavior of the total power
supply circuit. A ceramic capacitor or a tantalum capacitor with a smaller ceramic capacitor (100 nF) in parallel,
placed close to the input pins, is recommended.
Output Capacitors
One of the major parameters necessary to define the capacitance value of the output capacitor is the maximum
allowed output voltage ripple of the converter. This ripple is determined by two parameters of the capacitor, the
capacitance and the ESR. It is possible to calculate the minimum capacitance needed for the defined ripple,
supposing that the ESR is zero, by using Equation 7 for the boost converter output capacitor and Equation 8 for
the inverting converter output capacitor.
Parameter
f
is the switching frequency and
V
is the maximum allowed ripple.
With a chosen ripple voltage in the range of 10 mV, a minimum capacitance of 12 μF is needed. The total ripple
is larger due to the ESR of the output capacitor. This additional component of the ripple can be calculated using
Equation 9 for the boost converter and Equation 10 for the inverting converter.
An additional ripple of 2 mV is the result of using a typical ceramic capacitor with an ESR in a 10-m
range. The
total ripple is the sum of the ripple caused by the capacitance and the ripple caused by the ESR of the capacitor.
In this example, the total ripple is 10 mV. Additional ripple is caused by load transients. When the load current
increases rapidly, the output capacitor must provide the additional current until the inductor current has been
increased by the control loop by setting a higher on-time at the main switch (duty cycle). The higher duty cycle
results in longer inductor charging periods. But the rate of increase of the inductor current is also limited by the
inductance itself. When the load current decreases rapidly, the output capacitor needs to store the exessive
energy (stored in the inductor) until the regulator has decreased the inductor current by reducing the duty cycle.
The recommendation is to use higher capacitance values, as the aforegoing calculations show.
25
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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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