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參數(shù)資料
| 型號： | TPS40100RGER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | GREEN, PLASTIC, QFN-24 |
| 文件頁數(shù)： | 14/39頁 |
| 文件大小： | 762K |
| 代理商： | TPS40100RGER |
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R5 C4 +
R4
2 p
R1 fcTRK
(s)
(44)
t Time 1 ms/div
(200 mV/div)
tTRK +* R6 C5 ln 1 *
VOUT
VIN
(s)
(45)
TPS40100
SLUS601–MAY 2005
APPLICATION INFORMATION (continued)
Knowing the gain of the voltage loop looking into R4 and the desired tracking loop crossover frequency, R5 and
C4 can be found:
where
fCTRK is the desired tracking loop crossover frequency
The actual values of R5 and C4 are a balance between impedance level and component size. Any of a range of
values is applicable. In general, R5 should be no more than 20% of R6, and less than 10 k. If this is done, then
R6 can safely be ignored for purposes of tracking loop gain calculations. For general usage, R6 should probably
be between 100 k and 500 k.
If an overshoot bump is present on the output at the beginning a tracking controlled startup, the tracking loop
bandwidth is likely too high. Reducing the bandwidth helps reduce the initial overshoot. See Figure 11 and
Figure 12.
Figure 11. Excessive Tracking Loop Bandwidth
Figure 12. Limited Tracking Loop Bandwidth
The tracking ramp time is the time required for C5 to charge to the same voltage as the output voltage of the
converter.
where
VOUT is the output voltage of the converter
VIN is the voltage applied to the top of R6
tTRK is the desired tracking ramp time
With these equations, it is possible to design the tracking loop so that the impedance level of the loop and the
component size are balanced for the particular application. Note that higher impedances make the loop more
susceptible to noise issues while lower impedances require increased capacitor size.
Figure 13 shows the spice model for the voltage loop expanded for use with the tracking loop.
21
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相關(guān)代理商/技術(shù)參數(shù) |
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| TPS40100RGERG4 | 功能描述:DC/DC 開關(guān)控制器 Wide In Range Sync Buck for Sequencing 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 |
| TPS40100RGET | 功能描述:DC/DC 開關(guān)控制器 Wide In Range Sync Buck for Sequencing 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 |
| TPS40100RGETG4 | 功能描述:DC/DC 開關(guān)控制器 Wide In Range Sync Buck for Sequencing 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 |
| TPS40101 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH ADVANCED SEQUENCING AND OUTPUT MARGINING |
| TPS40101RGER | 功能描述:DC/DC 開關(guān)控制器 Mid Range Input Synch Buck Cntrlr 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 |
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