參數(shù)資料
型號(hào)： TPS40052PWP
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： GREEN, PLASTIC, HTSSOP-16
文件頁(yè)數(shù)： 6/33頁(yè)
文件大?。?/td> 753K
代理商： TPS40052PWP
TPS40052
SLUS563C AUGUST 2003 REVISED FEBRUARY 2005
14
www.ti.com
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 (17).
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 (18).
f
Z +
1
2
p
ESR
C
O
(Hertz)
Calculate the value of RBIAS to set the output voltage, VOUT.
R
BIAS +
V
EA_REF
R1
V
OUT * VEA_REF
W
The maximum crossover frequency (0 dB loop gain) is calculated in equation (20).
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 5 shows the modulator gain, L-C filter, output capacitor ESR zero, and the resulting response to be
compensated.
(17)
(18)
(19)
(20)
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