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參數(shù)資料
| 型號： | PTH08T240FAS |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 5/39頁 |
| 文件大?。?/td> | 1345K |
| 代理商： | PTH08T240FAS |
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Output Capacitor (Required)
Output Capacitor Information
TurboTrans Output Capacitance
Designing for Fast Load Transients
www.ti.com ............................................................................................................................................... SLTS277D – DECEMBER 2006 – REVISED MARCH 2009
The PTH08T240F requires a minimum output capacitance of 1000
F of aluminum, polymer-aluminum, tantulum,
or polymer-tantalum type.
The required capacitance above the minimum is determined by actual transient deviation requirements. See the
TurboTrans Technology application section within this document for specific capacitance selection.
When selecting output capacitors, the main considerations are capacitor type, temperature stability, and ESR.
Consider the capacitance X ESR product (see the following section).
Ceramic output capacitors added for high-frequency bypassing should be located as close as possible to the
load to be effective. Ceramic capacitor values below 10
F should not be included when calculating the total
output capacitance value.
When the operating temperature is below 0°C, the ESR of aluminum electrolytic capacitors increases. For these
applications, OS-CON, poly-aluminum, and polymer-tantalum types should be considered.
TurboTrans allows the designer to optimize the output capacitance according to the system transient design
requirement. High quality, ultra-low ESR capacitors are required to maximize TurboTrans effectiveness. The
capacitor's capacitance (
F) × ESR (m) product determines its capacitor type; Type B, or C. Capacitor types
are defined as follows:
Type B = (1000 < capacitance × ESR
≤ 5000) (e.g. polymer-tantalum)
Type C = (5000 < capacitance × ESR
≤ 10,000) (e.g. OS-CON)
When using more than one type of output capacitor, select the capacitor type that makes up the majority of your
total output capacitance. When calculating the C×ESR product, use the maximum ESR value from the capacitor
manufacturer's datasheet.
Working Examples:
A capacitor with a capacitance of 330
F and an ESR of 5 m, has a C × ESR product of 1650 F x m (330 F
× 5 m
). This is a Type B capacitor. A capacitor with a capacitance of 1000
F and an ESR of 8 m, has a
C × ESR product of 8000
F x m (1000 F × 8 m). This is a Type C capacitor.
See the TurboTrans Technology application section within this document for specific capacitance selection.
Table 3 includes a preferred list of capacitors by type and vendor. See the Output Bus / TurboTrans column.
The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of
2.5 A/s. The typical voltage deviation for this load transient is given in the Electrical Characteristics table using
the minimum required value of output capacitance. As the di/dt of a transient is increased, the response of a
converter’s regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent
limitation with any dc/dc converter once the speed of the transient exceeds its bandwidth capability.
If the target application specifies a higher di/dt or lower voltage deviation, the requirement can only be met with
additional low ESR ceramic capacitor decoupling. Generally, with load steps greater than 100 A/
s, adding
multiple 10
F ceramic capacitors plus 10 × 1 F, and numerous high frequency ceramics (≤ 0.1 F) is all that is
required to soften the transient higher frequency edges. The PCB location of these capacitors in relation to the
load is critical. DSP, FPGA and ASIC vendors identify types, location and amount of capacitance required for
optimum performance. Low impedance buses, unbroken PCB copper planes, and components located as close
as possible to the high frequency devices are essential for optimizing transient performance.
Copyright 2006–2009, Texas Instruments Incorporated
13
Product Folder Link(s): PTH08T240F
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PTH08T240FAST | 功能描述:DC/DC轉(zhuǎn)換器 10-A 4.5-14V Input Pwr Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PTH08T240FAZ | 功能描述:DC/DC轉(zhuǎn)換器 10-A 4.5-14V Input Pwr Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PTH08T240FAZT | 功能描述:DC/DC轉(zhuǎn)換器 10-A 4.5-14V Input Pwr Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標(biāo)稱）: 輸出端數(shù)量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: |
| PTH08T240W | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS? |
| PTH08T240W_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS |
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