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參數(shù)資料
| 型號： | TPS40050PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 8/36頁 |
| 文件大?。?/td> | 648K |
| 代理商： | TPS40050PWPRG4 |
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TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
16
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)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS40050-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40050QPWPRQ1 | 功能描述:DC/DC 開關控制器 Auto Cat Wide-Input Synch Buck RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40051 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Based Design Converts 12-V Bus to 1.8 V at 15 A (SLUP195) |
| TPS40051EVM-001 | 制造商:Texas Instruments 功能描述:TPS40051EVM-001 - Bulk |
| TPS40051EVM-002 | 制造商:Texas Instruments 功能描述:TPS40051EVM-002 - Bulk |
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