參數(shù)資料
型號(hào)： PTH08T250WAST
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源模塊
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
文件頁(yè)數(shù)： 7/39頁(yè)
文件大?。?/td> 2220K
代理商： PTH08T250WAST
www.ti.com
SLTS278G – NOVEMBER 2010 – REVISED MARCH 2009
TurboTrans Technology
TurboTrans technology is a feature introduced in the T2 generation of the PTH/PTV family of power modules.
TurboTrans optimizes the transient response of the regulator with added external capacitance using a single
external resistor. Benefits of this technology include reduced output capacitance, minimized output voltage
deviation following a load transient, and enhanced stability when using ultra-low ESR output capacitors. The
amount of output capacitance required to meet a target output voltage deviation is reduced with TurboTrans
activated. Likewise, for a given amount of output capacitance, with TurboTrans engaged, the amplitude of the
voltage deviation following a load transient is reduced. Applications requiring tight transient voltage tolerances
and minimized capacitor footprint area benefits greatly from this technology.
TurboTrans Selection
Utilizing TurboTrans requires connecting a resistor, RTT, between the +Sense pin (pin 17) and the TurboTrans
pin (pin 19). The value of the resistor directly corresponds to the amount of output capacitance required. All T2
products require a minimum value of output capacitance whether or not TurboTrans is utilized. For the
PTH08T250W, the minimum required capacitance is 1000 mF. When using TurboTrans, capacitors with a
capacitance × ESR product below 10,000 mF×m are required. (Multiply the capacitance (in mF) by the ESR (in
m
) to determine the capacitance × ESR product.) See the Capacitor Selection section of the datasheet for a
variety of capacitors that meet this criteria.
Figure 12 thru Figure 15 show the amount of output capacitance required to meet a desired transient voltage
deviation with and without TurboTrans for several capacitor types; Type B (e.g. polymer-tantalum) and Type C
(e.g. OS-CON). To calculate the proper value of RTT, first determine your required transient voltage deviation
limits and magnitude of your transient load step. Next, determine what type of output capacitors to be used. (If
more than one type of output capacitor is used, select the capacitor type that makes up the majority of your total
output capacitance.) Knowing this information, use the chart in Figure 12 thru Figure 15 that corresponds to the
capacitor type selected. To use the chart, begin by dividing the maximum voltage deviation limit (in mV) by the
magnitude of your load step (in Amps). This gives a mV/A value. Find this value on the Y-axis of the appropriate
chart. Read across the graph to the 'With TurboTrans' plot. From this point, read down to the X-axis which lists
the minimum required capacitance, CO, to meet that transient voltage deviation. The required RTT resistor value
can then be calculated using the equation or selected from the TurboTrans table. The TurboTrans tables include
both the required output capacitance and the corresponding RTT values to meet several values of transient
voltage deviation for 25% (12.5 A), 50% (25 A), and 75% (37.5 A) output load steps.
The chart can also be used to determine the achievable transient voltage deviation for a given amount of output
capacitance. Selecting the amount of output capacitance along the X-axis, reading up to the 'With TurboTrans'
curve, and then over to the Y-axis, gives the transient voltage deviation limit for that value of output capacitance.
The required RTT resistor value can be calculated using the equation or selected from the TurboTrans table.
As an example, let's look at a 12-V application requiring a 60 mV deviation during an 15 A load transient. A
majority of 470 mF, 10 m ouput capacitors are used. Use the 12 V, Type B capacitor chart, Figure 12. Dividing
60 mV by 15 A gives 4 mV/A transient voltage deviation per amp of transient load step. Select 4 mV/A on the
Y-axis and read across to the 'With TurboTrans' plot. Following this point down to the X-axis gives us a minimum
required output capacitance of approximately 1500 mF. The required RTT resistor value for 1500 mF can then be
calculated or selected from Table 4. The required RTT resistor is approximately 17.4 k.
To see the benefit of TurboTrans, follow the 4 mV/A marking across to the 'Without TurboTrans' plot. Following
that point down shows that you would need a minimum of 7500 mF of output capacitance to meet the same
transient deviation limit. This is the benefit of TurboTrans.
Copyright 2010–2009, Texas Instruments Incorporated
15
Product Folder Link(s): PTH08T250W
相關(guān)PDF資料
PDF描述
PTH08T250WAD 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH08T250WAS 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH08T250WAZ 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH08T255WAS DC-DC REG PWR SUPPLY MODULE
PTH08T255WAZ DC-DC REG PWR SUPPLY MODULE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PTH08T250WAZ 功能描述:DC/DC轉(zhuǎn)換器 50A 4.5V to 14V Inp Non-Isolated 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(chēng)）: 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:
PTH08T250WAZT 功能描述:DC/DC轉(zhuǎn)換器 50A 4.5V to 14V Inp Non-Isolated 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(chēng)）: 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:
PTH08T250WBD 制造商:Texas Instruments 功能描述:
PTH08T255WAD 功能描述:DC/DC轉(zhuǎn)換器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod 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(chēng)）: 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:
PTH08T255WAS 功能描述:DC/DC轉(zhuǎn)換器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod 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(chēng)）: 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:
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