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參數資料
| 型號： | TPS40075RHLTG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | PLASTIC, QFN-20 |
| 文件頁數： | 26/44頁 |
| 文件大小： | 806K |
| 代理商： | TPS40075RHLTG4 |
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100
100 k
10 k
1 k
1 M
10
20
10
20
30
40
0
Frequency Hz
Gain
dB
High Frequency Gain
fZ1
fZ2
fP2
fP1
V
O + VFB
R
Z1 ) RSET
R
SET
(49)
R
SET +
R
SET1
R
SET2
R
SET1 ) RSET2
(50)
GAIN +
R
PZ2
R
Z1
R
P1
R
Z1)RP1
(51)
f
P1 +
1
2p
R
P1
C
PZ1
(52)
f
P2 +
C
P2 ) CZ2
2p
R
PZ2
C
P2
C
Z2
^
1
2p
R
PZ2
C
P2
(53)
f
Z1 +
1
2p
R
Z1
C
PZ1
(54)
f
Z2 +
1
2p
R
PZ2 ) RP1
C
Z2
^
1
2p
R
PZ2
C
Z2
(55)
SLUS676A – MAY 2006 – REVISED SEPTEMBER 2007
A typical bode plot to this type of compensation network is shown in Figure 32.
Figure 32. 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 = 17.6 dB, or 7.586
32
Copyright 2006–2007, Texas Instruments Incorporated
Product Folder Link(s) :TPS40075
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