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參數(shù)資料
| 型號： | TPS51113DRCR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 4/26頁 |
| 文件大小： | 2137K |
| 代理商： | TPS51113DRCR |
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SLUS864 – MAY 2009 ....................................................................................................................................................................................................... www.ti.com
As a result, to meet the load transient response demand, the minimum output capacitance should be
(6)
where
IOH is the output current under heavy load conditions
IOL is the output current under light load conditions
V is the final peak capacitor voltage
Vi is the initial capacitor voltage
By considering the demand of both output ripple voltage and load transient response, the minimum output
capacitance can be determined.
INPUT CAPACITOR SELECTION
For a certain rated load current, input and output voltage, the input ripple voltage caused by the input
capacitance value and ESR are shown in Equation 7 and Equation 8, respectively.
(7)
(8)
Based on the required input voltage ripple, suitable capacitors can be chosen by using the above equations.
CHOOSING MOSFETS
Choosing suitable MOSFETs is extremely important to achieve high power conversion efficiency for the
converter. For a buck converter, suitable MOSFETs should not only meet the requirement of voltage and current
rating, but also ensure low power loss. VDD can be connected to the 5-V rail when Ciclon FETs are used. But
when less expensive FETs are used, direct gate drive facilitates the use of a higher drive voltage (such as VIN) to
boost the efficiency.
High-Side MOSFET
Power loss of the high-side MOSFETs primarily consists of the conduction loss (PCOND1) and the switching loss
(PSW1).
The conduction loss of the high-side MOSFET is the I2R loss in the MOSFET’s on-resistance, RDS(on)1. The RMS
value of the current passing through the top MOSFET depends on the average load current, ripple current and
duty cycle the converter is operating.
(9)
The conduction loss can, thus, be calculated as follows.
(10)
12
Copyright 2009, Texas Instruments Incorporated
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| TPS51113DRCT | 功能描述:DC/DC 開關(guān)控制器 4.5-13.2V Synch Buck Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS51113DRCT | 制造商:Texas Instruments 功能描述:; Controller Type:Synchronous Buck; Inpu |
| TPS51113EVM | 功能描述:電源管理IC開發(fā)工具 25A Synch Buck Cnvrtr Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS51116 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:COMPLETE DDR AND DDR2 MEMORY POWER SOLUTION SYNCHRONOUS BUCK CONTROLLER, 3-A LDO, BUFFERED REFERENCE |
| TPS51116_12 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:COMPLETE DDR, DDR2 AND DDR3 MEMORY POWER SOLUTION SYNCHRONOUS BUCK CONTROLLER, 3-A LDO, BUFFERED REFERENCE |
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