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參數資料
| 型號： | TPS54350MPWPREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 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： | 11/36頁 |
| 文件大小： | 1057K |
| 代理商： | TPS54350MPWPREP |
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SWITCHING FREQUENCY
RT(kW) +
46000
s(kHz) * 35.9
(9)
INPUT CAPACITORS
DVIN +
I
OUT(MAX)
0.25
C
BULK
sw )
I
OUT(MAX)
ESR
MAX
(10)
TPS54350-EP
SGLS308 – OCTOBER 2005
APPLICATION INFORMATION (continued)
To begin the design process a few parameters must be decided upon. The designer needs to know the following:
Input voltage range
Output voltage
Input ripple voltage
Output ripple voltage
Output current rating
Operating frequency
For this design example, use the following as the input parameters:
DESIGN PARAMETER(1)
EXAMPLE VALUE
Input voltage range
6 V to 18 V
Output voltage
3.3 V
Input ripple voltage
300 mV
Output ripple voltage
30 mV
Output current rating
3 A
Operating frequency
500 kHz
(1)
As an additional constraint, the design is set up to be small size
and low component height.
The switching frequency is set using the RT pin. Grounding the RT pin sets the PWM switching frequency to a
default frequency of 250 kHz. Floating the RT pin sets the PWM switching frequency to 500 kHz. By connecting
a resistor from RT to AGND, any frequency in the range of 250 to 700 kHz can be set. Use Equation 9 to
determine the proper value of RT.
In this example circuit, RT is not connected and the switching frequency is set at 500 kHz.
The TPS54350 requires an input decoupling capacitor and, depending on the application, a bulk input capacitor.
The minimum value for the decoupling capacitor (C9) is 10 F. A high quality ceramic type X5R or X7R is
recommended. The voltage rating should be greater than the maximum input voltage. Additionally some bulk
capacitance may be needed, especially if the TPS54350 circuit is not located within about two inches from the
input voltage source. The value for this capacitor is not critical but it also should be rated to handle the maximum
input voltage including ripple voltage and should filter the output so that input ripple voltage is acceptable.
This input ripple voltage can be approximated by Equation 10:
Where IOUT(MAX) is the maximum load current, fSW is the switching frequency, CBULK is the bulk capacitor value
and ESRMAX is the maximum series resistance of the bulk capacitor.
The maximum RMS ripple current also needs to be checked. For worst case conditions, this can be
approximated by Equation 11:
19
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS54350MPWPREPG4 | 功能描述:直流/直流開關調節器 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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54350PWP | 功能描述:直流/直流開關調節器 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 輸出端數量: 最大工作溫度: 安裝風格: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/直流開關調節器 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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54350PWPR | 功能描述:開關變換器、穩壓器與控制器 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 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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