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參數資料
| 型號： | TPS40200MDREPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 19/43頁 |
| 文件大小： | 1069K |
| 代理商： | TPS40200MDREPG4 |
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V
REF
C
7
R
8
R
10
R
6
C
8
P
1
z
1
p
2
Gain-dB
Frequency
A
V2
A
V1
Slope= 1
-
Error Amplifier Type-2
Compensation
1
f
f 2
SGLS371 – JANUARY 2007
Figure 37 shows the feedback network used in this application. This is a type-2 compensation network, which
gives a combination of good transient response and phase boost for good stability. This type of compensation
has a pole at the origin, causing a –20-dB/decade (–1) slope, followed by a zero that causes a region of flat
gain, followed by a final pole that returns the gain slope to –1. The Bode plot in Figure 38 shows the effect of
these poles and zeros.
The procedure for setting up the compensation network is as follows:
1. Determine the break frequency of the output capacitor.
2. Select a zero frequency well below this break frequency.
3. From the gain bandwidth of the error amplifier, select a crossover frequency where the amplifier gain is
large, relative to expected closed-loop gain.
4. Select a second zero well above the crossover frequency, which returns the gain slope to a –1 slope.
5. Calculate the required gain for the amplifier at crossover
Be prepared to iterate this procedure to optimize the pole and zero locations as needed.
Figure 37. Error Amplifier Feedback Elements
The frequency response of this converter is largely determined by two poles that arise from the LC output filter
and a higher-frequency zero caused by the ESR of the output capacitance. The poles from the output filter
cause a 40-dB/decade rolloff with a phase shift approaching 180
°, followed by the output capacitor zero that
reduced the rolloff to –20 dB and gives a phase boost back toward 90
°. In other nomenclature, this is a –2 slope
followed by a –1 slope. The two zeros in the compensation network act to cancel the double pole from the
output filter The compensation network’s two poles produce a region where the error amplifier is flat and can be
set to a gain, such that the overall gain of the system is 0 dB. This region is set so that it brackets the system
crossover frequency.
Figure 38. Error Amplifier Bode Plot
26
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