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參數(shù)資料
| 型號： | TPS40200MDREPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 20/43頁 |
| 文件大?。?/td> | 1069K |
| 代理商： | TPS40200MDREPG4 |
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R
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8
1
Z
C
R
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f
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SGLS371 – JANUARY 2007
In order to properly compensate this system, it is necessary to know the frequencies of its poles and zeros.
Step 1
The break frequency of the output capacitor is given by:
Where:
L = 33
H
C = 221
F
Because of the ESR of the output capacitor, this output filter has a single-pole response above the 1.8-kHz
break frequency of the output capacitor and its ESR. This simplifies compensation since the system becomes
essentially a single-pole system.
Step 2
The first zero is place well below the 1.8-kHz break frequency of the output capacitor and its ESR. Phase boost
from this zero is shown in Figure 39.
Where:
R8 = 100 k
C8 = 1500 pF
F
Z1 = 354 Hz
Step 3
From a minimum gain bandwidth product of 1.5 MHz, and knowing it has a 20-dB/decade rolloff, the gain of the
error amplifier is 33 dB at 35 kHz. This approximate frequency is chosen for a crossover frequency to keep the
amplifier gain contribution to the overall system gain small.
Step 4
The second zero is placed well above the 35-kHz crossover frequency.
Where:
R8 = 300 k
C7 = 10 pF
C8 = 1500 pF
fP3 = 53 kHz
27
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