- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69510 > TPS5420D (TEXAS INSTRUMENTS INC) 6.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 PDF資料下載
參數(shù)資料
| 型號： | TPS5420D |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 3/24頁 |
| 文件大?。?/td> | 738K |
| 代理商： | TPS5420D |
www.ti.com
Design Procedure
DVIN =
()
IOUT(MAX) x0.25
+IOUT(MAX)
MAX
xESR
CBULK
SW
x
(2)
I
CIN +
I
OUT(MAX)
2
(3)
SLVS642C – APRIL 2006 – REVISED OCTOBER 2007
The following design procedure can be used to select component values for the TPS5420. Alternately, the
SWIFT Designer Software may be used to generate a complete design. The SWIFT Designer Software uses
an iterative design procedure and accesses a comprehensive database of components when generating a
design. 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
10 V to 36 V
Output voltage
5 V
Input ripple voltage
300 mV
Output ripple voltage
30 mV
Output current rating
2 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 TPS5420 is internally set to 500 kHz. It is not possible to adjust the switching
frequency.
Input Capacitors
The TPS5420 requires an input decoupling capacitor and, depending on the application, a bulk input capacitor.
The recommended value for the decoupling capacitor is 10
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, two 4.7
μF capacitors, C1 and C4 are used 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 :
Where IOUT(MAX) is the maximum load current, fSW 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
In this example, the calculated input ripple voltage is 118 mV, and the RMS ripple current is 1.0 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 and parasitics associated with the layout.
Copyright 2006–2007, Texas Instruments Incorporated
11
Product Folder Link(s): TPS5420
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS54226PWP | DUAL SWITCHING CONTROLLER, PDSO20 |
| TPS54226RGTT | DUAL SWITCHING CONTROLLER, PQCC16 |
| TPS54232DR | SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS54232D | SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS54240DGQ | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS5420D | 制造商:Texas Instruments 功能描述:Linear Voltage Regulator IC |
| TPS5420DG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5 to 36V 2A Step Down Swift Conv 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 |
| TPS5420D-P | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| TPS5420DR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5 to 36V 2A Step Down Swift Conv 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 |
| TPS5420DRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.5 to 36V 2A Step Down Swift Conv 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。