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參數(shù)資料
| 型號： | TPS5410MDREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.6 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 3/25頁 |
| 文件大小： | 759K |
| 代理商： | TPS5410MDREP |
DVIN =
()
IOUT(MAX) x0.25
+IOUT(MAX)
MAX
xESR
CBULK
SW
x
I
CIN +
I
OUT(MAX)
2
www.ti.com ......................................................................................................................................................................................... SLVS910 – SEPTEMBER 2009
Design Procedure
The following design procedure can be used to select component values for the TPS5410. Alternately, see the TI
Web site at www.ti.com/swift for any available software tools to aid in the design process. This section presents a
simplified discussion of the design process.
To begin the design process, a few parameters must be determined. The designer must 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
14.5 V to 36 V
Output voltage
12 V
Input ripple voltage
300 mV
Output ripple voltage
50 mV
Output current rating
1 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 TPS5410 is internally set to 500 kHz. It is not possible to adjust the switching
frequency.
Input Capacitors
The TPS5410 requires an input decoupling capacitor and, depending on the application, a bulk input capacitor.
The minimum recommended value for the decoupling capacitor is 4.7
μF. A high quality ceramic type X5R or
X7R is required. For some applications, a smaller value decoupling capacitor may be used, if the input voltage
and current ripple ratings are not exceeded. The voltage rating must be greater than the maximum input voltage,
including ripple. For this design, a 4.7-
μF capacitor, C1 issued to allow for smaller 1812 case size to be used
while maintaining a 50 V rating.
This input ripple voltage can be approximated by Equation 2 :
(2)
Where IOUT(MAX) is the maximum load current, f SW is the switching frequency, CI 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 is approximated by
(3)
In this example, the calculated input ripple voltage is 137 mV, and the RMS ripple current is 0.5 A. The maximum
voltage across the input capacitors would be VIN max plus delta VIN/2. The chosen input decoupling capacitors
are rated for 50 V, and the ripple current capacity for each is 3 A at 500 kHz, providing ample margin. The actual
measured input ripple voltage may be larger than the calculated value due to the output impedance of the input
voltage source, decrease in actual capacitance due to bias voltage and parasitics associated with the layout.
Copyright 2009, Texas Instruments Incorporated
11
Product Folder Link(s): TPS5410-EP
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| TPS5410-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-A, WIDE INPUT RANGE, STEP-DOWN SWIFTa?￠ CONVERTER |
| TPS5410QDRQ1 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 AC 5.5-36V,1A,500kHz 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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| TPS54110EVM-044 | 制造商:Texas Instruments 功能描述:EVAL BOARD, TPS54110 ADJ 1.5A STEP-DOWN |
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