參數(shù)資料
型號(hào)： TPS54140QDRCRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PDSO10
封裝： GREEN, PLASTIC, SON-10
文件頁(yè)數(shù)： 19/50頁(yè)
文件大?。?/td> 1602K
代理商： TPS54140QDRCRQ1
Z
OUT
C
P
s
1
2
V
Adc
V
s
1
2
+
÷
p
è
=
+
÷
p
è
f
ps
L
Adc = gm
R
P
OUT
L
1
f
C
R
2
=
p
Z
OUT
ESR
1
C
R
2
=
p
f
Vref
VO
R1
R3
C1
C2
R2
CO
RO
gmea
COMP
VSENSE
Type2A
Type2B
Type1
C2
R3
C1
SLVSA24B
– OCTOBER 2009 – REVISED MARCH 2011
DETAILED DESCRIPTION (continued)
(14)
(15)
(16)
(17)
Small Signal Model for Frequency Compensation
The TPS54140 uses a transconductance amplifier for the error amplifier and readily supports three of the
commonly-used frequency compensation circuits. Compensation circuits Type 2A, Type 2B, and Type 1 are
shown in Figure 49. Type 2 circuits most likely implemented in high bandwidth power-supply designs using low
ESR output capacitors. The Type 1 circuit is used with power-supply designs with high-ESR aluminum
electrolytic or tantalum capacitors.. Equation 18 and Equation 19 show how to relate the frequency response of
the amplifier to the small signal model in Figure 49. The open-loop gain and bandwidth are modeled using the RO
and CO shown in Figure 49. See the application section for a design example using a Type 2A network with a
low ESR output capacitor.
Equation 18 through Equation 27 are provided as a reference for those who prefer to compensate using the
preferred methods. Those who prefer to use prescribed method use the method outlined in the application
section or use switched information.
Figure 49. Types of Frequency Compensation
26
Copyright
2009–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54140-Q1
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