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參數資料
| 型號： | TPS40132RHBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 40 A SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | GREEN, PLASTIC, QFN-32 |
| 文件頁數： | 17/40頁 |
| 文件大小： | 1032K |
| 代理商： | TPS40132RHBR |
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www.ti.com
fVCP2
S
1
46.3 kHz
2
=
p t
(44)
fESR
OUT
1
176.8 kHz
2
C
ESR
=
p
(45)
+
C2
R2
R3
C1
V
REF
C3
R1
(
)
(
)
(
)
(
) (
)
(
)
C(s)
s
R1
R3
C1
1
s
R2
C2
1
G
C2
C3
R1
C2
C3
s
R3
C1
1
s
R2
1
C2
C3
+
+
+
÷
=
÷
+
è
+
+
÷
÷
+
è
è
(46)
V(s)
C(s)
VC(s)
T
G
=
(47)
f
P1
ESR
1
2
R3
C1
=
p
(48)
f
P2
SW
1
C2
C3
2
R2
C2
C3
=
p
÷
+
è
(49)
f
Z1
VCP1
1
2
R2
C2
=
p
(50)
(
)
f
Z 2
VCP 2
1
2
R1
R3
C1
=
p
+
(51)
f
V
C
T ( j
2
)
1
p
=
(52)
SLUS776A – DECEMBER 2007 – REVISED FEBRUARY 2008
The ESR zero is calculated in Equation 45.
In this design, a Type III compensator is employed to compensate the loop.
Figure 9. Type III Compensator
The compensator transfer function is shown in Equation 46.
The loop gain transfer function is shown in Equation 47.
Assume the desired crossover frequency is 20 kHz. Place one zero at fVCP1 and another zero at fVCP2, then place
one pole at fESRand another pole at fSW. The compensator gain is then calculated to achieve the desired
bandwidth. In this design, the compensator gain, pole and zero are selected using the following equations:
From Equation 52 the compensator gain is solved as 2.09
×104.
24
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s) :TPS40132
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