參數(shù)資料
型號(hào)： TPS40211DRCTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10
封裝： GREEN, PLASTIC, SON-10
文件頁數(shù)： 15/47頁
文件大小： 1375K
代理商： TPS40211DRCTG4
COMP
CO
1
K
=
FB
COMP
CO
R1
R
R1 K
K
=
FB
L
FB
10
C
2
f
R
=
p
HF
L
FB
1
C
20
f
R
=
p
SLUS772D – MARCH 2008 – REVISED APRIL 2010
www.ti.com
Where:
KCO is the control to output gain of the converter, in V/V
gM is the transconductance of the power stage and modulator, in S
ROUT is the output load equivalent resistance, in
ZOUT is the output impedance, including the output capacitor, in
RISNS is the value of the current sense resistor, in
L is the value of the inductor, in H
COUT is the value of the output capacitance, in F
RESR is the equivalent series resistance of COUT, in
f SW is the switching frequency, in Hz
f L is the desired crossover frequency for the control loop, in Hz
These equations assume that the operation is discontinuous and that the load is purely resistive. The gain in
continuous conduction can be found by evaluating Equation 23 at the resistance that gives the critical conduction
current for the converter. Loads that are more like current sources give slightly higher gains than predicted here.
To find the gain of the compensation network required for a control loop of bandwidth fL, take the reciprocal of
(25)
The GBWP of the error amplifier is only guaranteed to be at least 1.5 MHz. If KCOMP multiplied by fL is greater
than 750 kHz, reduce the desired loop crossover frequency until this condition is satisfied. This ensures that the
high-frequency pole from the error amplifier response with the compensation network in place does not cause
excessive phase lag at f L and decreased phase margin in the loop.
The R-C network connected from COMP to FB places a zero in the compensation response. That zero should be
approximately 1/10th of the desired crossover frequency, f L. With that being the case, RFB and CFB can be found
(26)
(27)
Where:
R1 is the high side feedback resistor in Figure 27, in
Ω
fL is the desired loop crossover frequency, in Hz
Thought not strictly necessary, it is recommended that a capacitor be added between COMP and FB to provide
high-frequency noise attenuation in the control loop circuit. This capacitor introduces another pole in the
compensation response. The allowable location of that pole frequency determines the capacitor value. As a
starting point, the pole frequency should be 10 × fL. The value of CHF can be found from Equation 28.
(28)
22
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS40210 TPS40211
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