參數(shù)資料
型號(hào)： TPS54350MPWPREP
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 7.2 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, HTSSOP-16
文件頁數(shù)： 15/36頁
文件大小： 1057K
代理商： TPS54350MPWPREP
www.ti.com
R2 +
R1
0.891
V
OUT *
0.891
(19)
Z1 +
1
2pR3C6
(20)
INT +
1
2pR1C6
(21)
Z2 +
1
2pR1C8
(22)
P1 +
1
2pR5C8
(23)
P2 +
1
2pR3C7
(24)
INT +
10–0.9
CO
2
(25)
C6 +
1
2pR1
INT
(26)
R3 +
1
p
C6
LC
(27)
C8 +
1
2pR1
LC
(28)
ESR +
1
2pR
ESR
C
OUT
(29)
TPS54350-EP
SGLS308 – OCTOBER 2005
The closed loop crossover frequency should be greater than fLC and less than one fifth of the switching
frequency. Also, the crossover frequency should not exceed 50 kHz, as the error amplifier may not provide the
desired gain. For this design, a crossover frequency of 30 kHz was chosen. This value is chosen for
comparatively wide loop bandwidth while still allowing for adequate phase boost to insure stability.
Next calculate the R2 resistor value for the output voltage of 3.3 V using Equation 19:
For any TPS54350 design, start with an R1 value of 1 k
. R2 is then 374 .
Now the values for the compensation components that set the poles and zeros of the compensation network can
be calculated. Assuming that R1 > R5 and C6 > C7, the pole and zero locations are given by Equation 20
through Equation 23:
Additionally there is a pole at the origin, which has unity gain with the following frequency:
This pole is used to set the overall gain of the compensated error amplifier and determines the closed loop
crossover frequency. Since R1 is given as 1 k
and the crossover frequency is selected as 30 kHz, the desired
fINT can be calculated with Equation 25:
And the value for C6 is given by Equation 26:
The first zero, fZ1, is located at one half the output filter LC corner frequency, so R3 can be calculated from:
The second zero, fZ2, is located at the output filter LC corner frequency, so C8 can be calculated from:
The first pole, fP1, is located to coincide with the output filter ESR zero frequency. This frequency is given by:
where RESR is the equivalent series resistance of the output capacitor.
In this case, the ESR zero frequency is 35.4 kHz and R5 can be calculated from:
22
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS54350MPWPREPG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4.5 to 20V Input,3A Step Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54350PWP 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4.5 to 20V Inp 3A Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54350PWP 制造商:Texas Instruments 功能描述:IC's
TPS54350PWPG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4.5 to 20V Inp 3A Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS54350PWPR 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 4.5 to 20V Inp 3A Step-Down Converter RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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