參數(shù)資料
型號(hào)： TPS40100RGER
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PQCC24
封裝： GREEN, PLASTIC, QFN-24
文件頁(yè)數(shù)： 10/39頁(yè)
文件大小： 762K
代理商： TPS40100RGER
www.ti.com
fP + fC 10 +
1
2 p
R2 C1
(Hz)
(32)
fZ +
fC
10 +
1
2 p
R2 C2
(Hz)
(33)
Compensating the Loop (Type III)
+
VX
COMP
Error Amplifier
FB
UDG04143
R2
R1
RBIAS
C2
C1
R3
C3
f Frequency kHz
Gain
dB
fZ
fZ3
fP3
KHF
KCOMP(co)
KLF
fC
fP
TPS40100
SLUS601–MAY 2005
APPLICATION INFORMATION (continued)
If the output capacitor does not have sufficient ESR to use the phase shift from the ESR zero, a Type III
compensator is required. This is the case for most designs with ceramic output capacitors only. A series R-C
circuit is added in parallel to R1 as shown in Figure 8.
This is the same compensator as in Figure 6 except for the addition of C3 and R3. A typical response of this
circuit is shown in Figure 9.
COMPENSATOR GAIN
vs
FREQUENCY
Figure 9.
Figure 8. Type III Compensator Schematic
The reason for using the Type III compensator is to take advantage of the phase lead associated with the
upward slope of the gain between fZ3 and fP3. The crossover frequency should be located between these two
frequencies. The amount of phase lead generated is dependent on the separation of the fZ3 and fP3. In general, if
fZ3 is one half of fC and fP3 is twice fC, the amount of phase lead at fC generated is sufficient for most applications.
Certainly more or less may be used depending on the situation.
As an example of selecting the extra required extra phase lead, suppose that the control to output gain phase
evaluates to -145° at fC. The Type II compensator has approximately 11.5° of phase lag at fC due to the origin
pole, the zero at fC/10 and the pole at 10xfC. This would give only 23.5° of phase margin, which while stable is
not ideal. Placing fZ3 and fP3 at one half and twice the crossover frequency respectively adds approximately 36°
of phase lead at fC for a new phase margin of 59.5°.
To calculate the values for this type of compensator, first select R1. Again the choice is somewhat arbitrary. 10
k is a suggested value.
18
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TPS40100RGET 功能描述:DC/DC 開(kāi)關(guān)控制器 Wide In Range Sync Buck for Sequencing RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40100RGETG4 功能描述:DC/DC 開(kāi)關(guān)控制器 Wide In Range Sync Buck for Sequencing RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS40101 制造商:TI 制造商全稱:Texas Instruments 功能描述:MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH ADVANCED SEQUENCING AND OUTPUT MARGINING
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