參數(shù)資料
型號(hào)： PTH08T210WAS
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
封裝： DIP-14
文件頁(yè)數(shù)： 2/31頁(yè)
文件大?。?/td> 1235K
代理商： PTH08T210WAS
Ceramic Capacitors
Tantalum, Polymer-Tantalum Capacitors
Capacitor Table
Designing for Fast Load Transients
SLTS262I – OCTOBER 2005 – REVISED MARCH 2009 ................................................................................................................................................... www.ti.com
When using a combination of one or more non-ceramic capacitors, the calculated equivalent ESR should be no
lower than 2m
(4m when calculating using the manufacturer’s maximum ESR values). A list of preferred
low-ESR type capacitors, are identified in Table 1.
Above 150 kHz the performance of aluminum electrolytic capacitors is less effective. Multilayer ceramic
capacitors have very low ESR and a resonant frequency higher than the bandwidth of the regulator. They can be
used to reduce the reflected ripple current at the input as well as improve the transient response of the output.
When used on the output their combined ESR is not critical as long as the total value of ceramic capacitors, with
values between 10 F and 100 F, does not exceed 5000 F (non-TurboTrans). In TurboTrans applications,
when ceramic capacitors are used on the output bus, total capacitance including bulk and ceramic types is not to
exceed 12,000
F.
Tantalum type capacitors are only used on the output bus, and are recommended for applications where the
ambient operating temperature is less than 0°C. The AVX TPS series and Kemet capacitor series are suggested
over many other tantalum types due to their higher rated surge, power dissipation, and ripple current capability.
As a caution, many general-purpose tantalum capacitors have higher ESR, reduced power dissipation, and lower
ripple current capability. These capacitors are also less reliable due to their reduced power dissipation and surge
current ratings. Tantalum capacitors that have no stated ESR or surge current rating are not recommended for
power applications.
Table 1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple
current (rms) ratings. The recommended number of capacitors required at both the input and output buses is
identified for each capacitor type.
This is not an extensive capacitor list. Capacitors from other vendors are available with comparable
specifications. Those listed are for guidance. The RMS ripple current rating and ESR (at 100 kHz) are critical
parameters necessary to ensure both optimum regulator performance and long capacitor life.
The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of
2.5A/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 50% load steps at > 100A/
s, adding multiple
10
F ceramic capacitors, 3225 case size, plus 10×1F, including numerous high frequency ceramics (≤0.1F)
are all that is required to soften the transient higher frequency edges. Special attention is essential with regards
to location, types, and position of higher frequency ceramic and lower ESR bulk capacitors. DSP, FPGA and
ASIC vendors identify types, location and capacitance required for optimum performance of the high frequency
devices. The details regarding the PCB layout and capacitor/component placement are important at these high
frequencies. Low impedance buses and unbroken PCB copper planes with components located as close to the
high frequency processor are essential for optimizing transient performance. In many instances additional
capacitors may be required to insure and minimize transient aberrations.
10
Copyright 2005–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH08T210W
相關(guān)PDF資料
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參數(shù)描述
PTH08T210WAST 功能描述:DC/DC轉(zhuǎn)換器 30A 5.5-14V-Inp Wide-Out Adj Pwr Mdl 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:
PTH08T210WAZ 功能描述:DC/DC轉(zhuǎn)換器 30A 5.5-14V-Inp Wide-Out Adj Pwr Mdl 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:
PTH08T210WAZT 功能描述:DC/DC轉(zhuǎn)換器 30A 5.5-14V-Inp Wide-Out Adj Pwr Mdl 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:
PTH08T212WAZ 制造商:Texas Instruments 功能描述:
PTH08T220W 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans
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