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參數資料
| 型號： | TPS5430MDDAREPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 8.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, SOP-8 |
| 文件頁數： | 5/28頁 |
| 文件大小： | 846K |
| 代理商： | TPS5430MDDAREPG4 |
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DVIN +
I
OUT(MAX)
0.25
CBULK
sw
) IOUT(MAX)
ESR
MAX
(2)
I
CIN +
I
OUT(MAX)
2
(3)
www.ti.com................................................................................................................................................................................................... SLVS911 – MARCH 2009
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
approximately 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.
Copyright 2009, Texas Instruments Incorporated
13
Product Folder Link(s): TPS5430-EP
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相關代理商/技術參數 |
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| TPS5430-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-A WIDE-INPUT-RANGE STEP-DOWN SWIFT CONVERTER |
| TPS5430QDDARQ1 | 功能描述:直流/直流開關調節器 3A Wide-Input-Range 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 |
| TPS5431 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.6 MHz, 3-V TO 6-V INPUT, 3-A SYNCHRONOUS STEP-DOWN SWIFT⑩ CONVERTER WITH DISABLED SINKING DURING START-UP |
| TPS54310 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-V TO 6-V INPUT, 3-A OUTPUT SYNCHRONOUS-BUCK PWM SWITCHER WITH INTEGRATED FETs |
| TPS54310-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-V TO 6-V INPUT, 3-A OUTPUT,SYNCHRONOUS BUCK PWM SWITCHER WITH INTEGRATED FETs(SWIFT?) |
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