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| 型号： | TPS53321RGTR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1210 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, QFN-16 |
| 文件页数： | 8/23页 |
| 文件大小： | 505K |
| 代理商： | TPS53321RGTR |
=
p
fESR
OUT
1
2
ESR C
R3
R1
C1
R2
R4
C2
C3
+
COMP
VREF
UGD-10058
UDG-10057
Frequency
f
Z1
f
Z2
f
P2
f
P3
G
a
in
(d
B
)
(
)(
)
(
) (
)
+
+
=
+
+
+
÷
+
è
1
3
4
2
EA
2
3
1
2
3
1
3
4
2
3
1 s C
(R
R ) 1 s R
C
G
C
s R
(C
C )
1 s C
R
1 s R
C
=
p
fZ1
4
2
1
2
R
C
=
@
p
+
p
fZ2
1
3
1
2
(R
R ) C
2
R
C
=
fP1 0
=
p
fP2
3
1
2
R
C
=
@
p
p
÷
+
è
fP3
4
3
2
3
4
2
3
1
2
R
C
2
R
C
SLUSAF3 – DECEMBER 2010
www.ti.com
(14)
Figure 15 and Figure 16 show the configuration of Type III compensation and typical pole and zero locations.
Equation 16 through Equation 20 describe the compensator transfer function and poles and zeros of the Type III
network.
Figure 15. Type III Compensation Network
Figure 16. Type III Compensation Gain Plot and
Configuration Schematic
Zero/Pole Placement
(15)
(16)
(17)
(18)
(19)
(20)
The two zeros can be placed near the double pole frequency to cancel the response from the double pole. One
pole can be used to cancel ESR zero, and the other non-zero pole can be placed at half switching frequency to
attenuate the high frequency noise and switching ripple. Suitable values can be selected to achieve a
compromise between high phase margin and fast response. A phase margin higher than 45 degrees is required
for stable operation.
For DCM operation, a C3 between 56 pF and 150 pF is recommended for output capacitance between 20 F to
200 F.
16
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS53321
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