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參數(shù)資料
| 型號： | PTH08T240FAD |
| 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)： | 8/39頁 |
| 文件大?。?/td> | 1345K |
| 代理商： | PTH08T240FAD |
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TurboTrans Technology
TurboTrans Selection
SLTS277D – DECEMBER 2006 – REVISED MARCH 2009 ............................................................................................................................................... www.ti.com
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, 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.
Utilizing TurboTrans requires connecting a resistor, RTT, between the +Sense pin (pin 6) and the TurboTrans pin
(pin 9). The value of the resistor directly corresponds to the amount of output capacitance required. All T2
products require a minimum value of output capacitance. For the PTH08T240F, the minimum required
capacitance is 1000
F. Capacitors with a capacitance × ESR product above 1000 F×m and below 10,000
F×m are required. (Multiply the capacitance (in F) 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 14 thru Figure 21 show the amount of output capacitance required to meet a desired transient voltage
deviation for Type B (e.g. polymer-tantalum) and Type C (e.g. OS-CON) capacitors. 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 are 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 (Figure 14 thru Figure 21) 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 '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% (2.5 A), 50% (5 A), and
75% (7.5 A) output load steps.
The chart can also be used to determine the achievable transient voltage deviation for a given amount of output
capacitance. By selecting the amount of output capacitance along the X-axis, reading up to the desired
'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 5-V application requiring a 15-mV deviation during a 3-A load transient. A majority
of 680-
F, 10-mΩ ouput capacitors will be used. (680 (in F) × 10 (in mΩ) = 6,800; therefore this is Type C
capacitance). Use the 5-V, Type C capacitor chart, Figure 19. Dividing 15 mV by 3 A gives 5 mV/A transient
voltage deviation per amp of transient load step. Select 5 mV/A on the Y-axis and read across to the
'TurboTrans'' plot. Following this point down to the X-axis gives a minimum required output capacitance of
approximately 1800
F. The required R
TT resistor value for 1800 F can then be calculated or selected from
Applications operating from an input bus greater than 8 V may encounter reduced transient performance when
the output voltage is less than VI/11. Additional output capacitance may be required in order to achieve the
expected transient performance. See Figure 17 and Figure 21 when operating at an increased VI to VO ratio.
16
Copyright 2006–2009, Texas Instruments Incorporated
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 |
|---|---|
| PTH08T240FAS | 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: |
| 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? |
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