參數(shù)資料
型號(hào)： TPS40050QPWPRQ1
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： PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 9/35頁(yè)
文件大小： 498K
代理商： TPS40050QPWPRQ1
TPS40050Q1
TPS40051Q1
TPS40053Q1
SGLS219A NOVEMBER 2003 REVISED MAY 2008
www.ti.com
17
APPLICATION INFORMATION
Calculate the Poles and Zeros
For a buck converter using voltage mode control there is a double pole due to the output L-CO. The double pole
is located at the frequency calculated in equation (21).
f
LC +
1
2
p
L
C
O
(Hertz)
There is also a zero created by the output capacitance, CO, and its associated ESR. The ESR zero is located
at the frequency calculated in equation (22).
f
Z +
1
2
p
ESR
C
O
(Hertz)
Calculate the value of RBIAS to set the output voltage, VOUT.
R
BIAS +
0.7
R1
V
OUT * 0.7
W
The maximum crossover frequency (0 dB loop gain) is calculated in equation (24).
f
C +
f
SW
4
(Hertz)
Typically, fC is selected to be close to the midpoint between the L-CO double pole and the ESR zero. At this
frequency, the control to output gain has a –2 slope (40 dB/decade), while the Type III topology has a +1 slope
(20 dB/decade), resulting in an overall closed loop –1 slope (20 dB/decade).
Figure 10 shows the modulator gain, L-C filter, output capacitor ESR zero, and the resulting response to be
compensated.
Figure 9
VC
PWM MODULATOR RELATIONSHIPS
VS
D = VC / VS
MODULATOR GAIN
vs
SWITCHING FREQUENCY
Modulator
Gain
dB
Figure 10
fSW Switching Frequency Hz
100
1 k
10 k
100 k
ESR Zero, + 1
LC Filter, 2
AMOD =VIN / VS
Resultant, 1
(21)
(22)
(23)
(24)
相關(guān)PDF資料
PDF描述
TPS40051QPWPRQ1 SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
TPS40051PWP 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
TPS40050PWP 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
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