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參數(shù)資料
| 型號： | TPS54226PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 封裝： | PACKAGE-14 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 501K |
| 代理商： | TPS54226PW |
L =
O
V
OUT
V
IN(max)
V
IN(max)
OUT
-
I
f
Kind
OUT
SW
Ilp-p=
V
OUT
V
IN(max)
V
-V
IN(max)
OUT
L
f
O
SW
I
=I +
lpeak
O
Ilp-p
2
SLVSA14B – OCTOBER 2009 – REVISED JUNE 2010
www.ti.com
DESIGN GUIDE
Step By Step Design Procedure
This example details the design of a switching regulator design using ceramic output capacitors.
This design is available as the HPA539 evaluation module (EVM). A few parameters must be known in order
to
start the design process. These parameters are typically determined on the system level. For this example,
start with the following known parameters:
Input voltage range = 4.5 -18 V
Output voltage = 1.05 V
Output current = 2 A
Output voltage ripple = 3% of output voltage (1.05 V x 0.03 = 31.5 mV
Figure 14 shows the schematic diagram for this design example.
Figure 14. Schematic
Output Inductor Selection
The inductance value is selected to provide approximately 30% peak to peak ripple current at maximum load.
Larger ripple current increases output ripple voltage, improves S/N ratio and contributes to stable operation.
Smaller ripple currents result in lower output voltage ripple. When using low ESR output capacitors output ripple
voltage is usually low, so larger ripple currents are acceptable. The coefficient Kind represents the percentage of
ripple current. The value of Kind must not be greater than 0.4. Use 0.3 when using low ESR output capacitors.
Equation 3 can be used to calculate L1. Use 700 kHz for fSW. Make sure the chosen inductor is rated for the
peak current of Equation 5 and the RMS current of Equation 6.
(3)
(4)
(5)
12
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54226
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS54226PWP | 功能描述:直流/直流開關調(diào)節(jié)器 4.5-18V 2A Sync 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54226PWP | 制造商:Texas Instruments 功能描述:DC/DC STEP DOWN CONVERTER IC 700kHz HT 制造商:Texas Instruments 功能描述:IC, SYNC STEP-DOWN DC/DC CONV, HTSSOP-14 |
| TPS54226PWPR | 功能描述:直流/直流開關調(diào)節(jié)器 4.5-18V 2A Sync 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(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54226RGTR | 功能描述:直流/直流開關轉換器 4.5-18V Inp,2A Synch Step Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS54226RGTT | 功能描述:直流/直流開關轉換器 4.5-18V Inp,2A Synch Step Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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