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參數資料
| 型號： | TPS40101RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | PLASTIC, QFN-24 |
| 文件頁數： | 15/37頁 |
| 文件大小： | 774K |
| 代理商： | TPS40101RGET |
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R
5
C
4 +
R
4
2 p
R1
f
cTRK
(s)
(26)
t Time 1 ms/div
(200 mV/div)
t
TRK + * R6
C
5
ln 1
*
V
OUT
V
IN
(s)
(27)
SLUS726 – SEPTEMBER 2006
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
f
CTRK 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 32 and
Figure 32. Excessive Tracking Loop Bandwidth
Figure 33. 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
V
OUT is the output voltage of the converter
V
IN is the voltage applied to the top of R6
t
TRK 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 34 shows the spice model for the voltage loop expanded for use with the tracking loop.
22
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相關代理商/技術參數 |
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| TPS40101RGETG4 | 功能描述:DC/DC 開關控制器 Mid Range Input Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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