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參數(shù)資料
| 型號： | TPS40050PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 9/36頁 |
| 文件大?。?/td> | 648K |
| 代理商： | TPS40050PWPRG4 |
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TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
17
A
PPLICATION INFORMATION
A Type III topology, shown in Figure 11, has two zero-pole pairs in addition to a pole at the origin. The gain and
phase boost of a Type III topology is shown in Figure 12. The two zeros are used to compensate the L-CO double
pole and provide phase boost. The double pole is used to compensate for the ESR zero and provide controlled
gain roll-off. In many cases the second pole can be eliminated and the amplifier’s gain roll-off used to roll-off
the overall gain at higher frequencies.
RBIAS
Figure 11. Type III Compensation Configuration
UDG02189
+
R1
R3
C3
C2
(optional)
C1
R2
7
8
VREF
VOUT
COMP
VFB
Figure 12. Type III Compensation Gain and
Phase
GAIN
180
°
90
°
270
°
PHASE
+ 1
1
0 dB
The poles and zeros for a Type III network are described in equations (25).
f
Z1 +
1
2
p
R2
C1
(Hertz)
f
Z2 +
1
2
p
R1
C3
(Hertz)
f
P1 +
1
2
p
R2
C2
(Hertz)
f
P2 +
1
2
p
R3
C3
(Hertz)
The value of R1 is somewhat arbitraty, but influences other component values. A value between 50k
and
100k
usually yields reasonable values.
The unity gain frequency is described in equation (26)
f
C +
1
2
p
R1
C2
G
(Hertz)
where G is the reciprocal of the modulator gain at fC.
The modulator gain as a function of frequency at fC, is described in equation (27).
AMOD(f)
+ AMOD
f
LC
f
C
2
and
G
+
1
AMOD(f)
(25)
(26)
(27)
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