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參數(shù)資料
| 型號： | TPS51113DRCR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大小： | 2137K |
| 代理商： | TPS51113DRCR |
UDG-08110
+
COMP
C1
22 nF
R2
2.7 kW
C2
3.9 nF
R
BIAS
2 kW
C3
8.2 nF
R3
130 W
R1
V
REF
V
OUT
FB
( )
(
)
(
)
(
)
(
)
(
)
2
1
3
2
1
2
1
2
3
1
2
sR C
1
s R
R
C
1
G s
R C C
sR
C
s
1
sR C
1
C
+
+
=
+
+
+
÷
÷
÷
+
è
è
Z1
2
1
f
2.7 kHz
2
R
C
=
p
(
)
Z2
1
3
1
f
9.2kHz
2
R
C
=
p
+
(
)
(
)
P1
1
2
1
2
1
f
17.8 kHz
C
2
R
C
=
p
÷
÷
+
è
P2
3
1
f
149.4 kHz
2
R
C
=
p
(
)
C
1
2
1
f
3.1kHz
2
R
C
=
p
+
1
BIAS
O
0.8
R
2k
V
0.8
=
W
-
www.ti.com ....................................................................................................................................................................................................... SLUS864 – MAY 2009
Figure 10 shows the detailed parameters used for the Type III compensation. Also, poles and zeros for the Type
III network are derived based on Equation 22 through Equation 26.
Figure 10. Parameters for Type III Compensation Network
(37)
(38)
(39)
(40)
(41)
(42)
fP1 is used to cancel the ESR zero. fP2 is placed at higher frequency to attenuate the high-frequency noise and
the switching ripple. fZ1 is lower than resonant frequency f0.
(43)
Based on Equation 43 and the power stage parameters, the bode-plot by simulation is shown in Figure 10
(VIN=12 V and IOUT=0 A). The achieved cross-over frequency is approximately 35.7 kHz, and the phase margin is
approximately 60°.
Copyright 2009, Texas Instruments Incorporated
19
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