參數(shù)資料
型號(hào)： TPS40055PWP
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 9/35頁(yè)
文件大?。?/td> 866K
代理商： TPS40055PWP
GAIN
180
°
-90
°
-270
°
PHASE
+1
-1
0dB
+
R1
R
BIAS
R3
C3
C2
(optional)
C1
R2
7
8
VREF
V
O
COMP
VFB
UDG-08103
f
Z1 +
1
2p
R2
C1
(Hertz)
f
Z2 +
1
2p
R1
C3
(Hertz)
(24)
f
P1 +
1
2p
R2
C2
(Hertz)
f
P2 +
1
2p
R3
C3
(Hertz)
f
C +
1
2p
R1
C2
G
(Hertz)
(25)
AMOD(f) + AMOD
f
LC
f
C
2
and
G +
1
AMOD(f)
(26)
www.ti.com ...................................................................................................................................... SLUS593F – DECEMBER 2003 – REVISED SEPTEMBER 2008
A Type III topology, shown in Figure 12, 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 13. 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.
Figure 12. Type III Compensation Configuration
Figure 13. Type III Compensation Gain and Phase
The poles and zeros for a Type III network are described in Equation 24.
The value of R1 is somewhat arbitrary, but influences other component values. A value between 50 k
and
100 k
usually yields reasonable values.
The unity gain frequency is described in Equation 25.
where
G is the reciprocal of the modulator gain at f
C
The modulator gain as a function of frequency at fC, is described in Equation 26.
Copyright 2003–2008, Texas Instruments Incorporated
17
Product Folder Link(s): TPS40054 TPS40055 TPS40057
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