參數(shù)資料
型號(hào)： TPS43000PWG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, TSSOP-16
文件頁(yè)數(shù)： 7/31頁(yè)
文件大?。?/td> 615K
代理商： TPS43000PWG4
TPS43000
SLUS489 OCTOBER 2001
15
www.ti.com
APPLICATION INFORMATION
The frequency of the poles and zeros are defined by the following equations:
zeros
f
z1 +
1
(2
p
R2
C1)
f
z2 [
1
(2
p
R1
C3)
, assuming R1
R3
poles
f
p1 +
1
(2
p
R3
C3)
f
p2 [
1
(2
p
R2
C2)
, assuming C1
C2
In voltage mode control, the buck, boost, flyback, and SEPIC toplogies all have a 2nd order double-pole LC filter
characteristic when operated in CCM. In the buck topology, the frequency of the LC double pole is straight
forward.
f
LC +
1
2
p(LC)
1 2
buck topology
In the boost, flyback, and SEPIC toplogies, the frequency of the LC double pole varies as a function of the duty
cycle.
f
LC +
(1
* D)
2
p(LC)
1 2
boost, flyback, & SEPIC topologies
In addition, each of the topologies have an ESR zero, which occurs when the output capacitor impedance
transitions from capacitive to resistive. The frequency at which this occurs is the ESR zero frequency, fESR, and
is defined by the equation:
f
ESR +
1
2
p R
ESR
C
In the boost, flyback, and SEPIC topologies operated in CCM, there is also a right half-plane (RHP) zero. The
RHP zero has the same positive gain slope as the conventional zero, but has a 90
° phase lag. This combination,
in conjunction with its dependence on line and load, make it nearly impossible to compensate within the control
loop. The frequency at which this RHP zero occurs, fRHP, is defined by the equations:
f
RHP +
R
O
(1
* D)
2
(2
p L)
boost topology
f
RHP +
R
O
(1
* D)
2
(2
p LD)
flyback topology
where RO is the equivalent output load resistance.
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
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