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參數(shù)資料
| 型號： | TPS40074RHLRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | GREEN, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 22/41頁 |
| 文件大小： | 765K |
| 代理商： | TPS40074RHLRG4 |
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100 k
10 k
1 k
1 M
10
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10
20
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40
0
Frequency Hz
Gain
dB
High Frequency Gain
fZ1
fZ2
fP2
fP1
V
O + VFB
R
Z1 ) RSET
R
SET
(51)
R
SET +
R
SET1
R
SET2
R
SET1 ) RSET2
(52)
GAIN +
R
PZ2
R
Z1
R
P1
R
Z1)RP1
(53)
f
P1 +
1
2p
R
P1
C
PZ1
(54)
f
P2 +
C
P2 ) CZ2
2p
R
PZ2
C
P2
C
Z2
^
1
2p
R
PZ2
C
P2
(55)
f
Z1 +
1
2p
R
Z1
C
PZ1
(56)
f
Z2 +
1
2p
R
PZ2 ) RP1
C
Z2
^
1
2p
R
PZ2
C
Z2
(57)
SLUS617B – APRIL 2005 – REVISED OCTOBER 2006
Figure 17. Type III Compensation Bode Plot
The high frequency gain and the break (pole and zero) frequencies are calculated using the following equations.
Using this PWM and L-C bode plot the following actions ensure stability.
1. Place two zero’s close to the double pole, i.e. fZ1 = fZ2 = 3559 Hz
2. Place a pole at one octave below the desired crossover frequency. The crossover frequency was selected
as one quarter the switching frequency, fCO = 100 kHz, fP1 = 50 kHz
3. Place the second pole about an octave above fco. This ensures that the overall system gain falls off quickly
to give good gain margin, fP2 = 200 kHz
4. The high-frequency gain is sufficient to ensure 0 dB at the required crossover frequency, GAIN = -1 × GAIN
of PWM and LC at the crossover frequency, GAIN = 17.2 dB, or 7.24
Desired frequency response and resultant overall system response can be seen in Figure 18.
29
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