參數(shù)資料
型號(hào)： TPS5430DDARG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 6 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8
封裝： GREEN, PLASTIC, SOP-8
文件頁數(shù)： 4/28頁
文件大?。?/td> 810K
代理商： TPS5430DDARG4
www.ti.com
DVIN +
I
OUT(MAX)
0.25
CBULK
sw
) IOUT(MAX)
ESR
MAX
(2)
I
CIN +
I
OUT(MAX)
2
(3)
SLVS632C – JANUARY 2006 – REVISED NOVEMBER 2006
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
Design Parameters
For this design example, use the following as the input parameters:
DESIGN PARAMETER(1)
EXAMPLE VALUE
Input voltage range
10.8 V to 19.8 V
Output voltage
5 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.
Switching Frequency
The switching frequency for the TPS5430 is internally set to 500 kHz. It is not possible to adjust the switching
frequency.
Input Capacitors
The TPS5430 requires an input decoupling capacitor and, depending on the application, a bulk input capacitor.
The recommended value for the decoupling capacitor, C1, is 10
F. A high quality ceramic type X5R or X7R is
required. For some applications, a smaller value decoupling capacitor may be used, so long as the input voltage
and current ripple ratings are not exceeded. The voltage rating must be greater than the maximum input voltage,
including ripple.
This input ripple voltage can be approximated by Equation 2 :
Where IOUT(MAX) is the maximum load current, fSW is the switching frequency, CIN is the input capacitor value and
ESRMAX is the maximum series resistance of the input capacitor.
The maximum RMS ripple current also needs to be checked. For worst case conditions, this can be
approximated by Equation 3 :
In this case the input ripple voltage would be 156 mV and the RMS ripple current would be 1.5 A. The maximum
voltage across the input capacitors would be VIN max plus delta VIN/2. The chosen input decoupling capacitor
is rated for 25 V and the ripple current capacity is greater than 3 A, providing ample margin. It is very important
that the maximum ratings for voltage and current are not exceeded under any circumstance.
Additionally some bulk capacitance may be needed, especially if the TPS5430 circuit is not located within about
2 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.
12
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS5430DDARG4 制造商:Texas Instruments 功能描述:DC/DC Converter IC
TPS5430-EP 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-A WIDE-INPUT-RANGE STEP-DOWN SWIFTa?￠ CONVERTER
TPS5430EVM-136 功能描述:電源管理IC開發(fā)工具 TPS5430EVM-136 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS5430EVM-173 功能描述:電源管理IC開發(fā)工具 Step Down Conv Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS5430EVM-173 制造商:Texas Instruments 功能描述:EVALUATION MODULE KIT
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