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參數(shù)資料
| 型號： | TPS57114QRTERQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數(shù)： | 14/37頁 |
| 文件大小： | 1309K |
| 代理商： | TPS57114QRTERQ1 |
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4
SLVSAH5A
– DECEMBER 2010 – REVISED MARCH 2011
APPLICATION INFORMATION
DESIGN GUIDE
– STEP-BY-STEP DESIGN PROCEDURE
This example details the design of a high frequency switching regulator design using ceramic output capacitors.
This design is available as the HPA375 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, we
start with the following known parameters:
Output Voltage
1.8 V
Transient Response 1 to 2A load step
ΔVout = 5%
Maximum Output Current
4 A
Input Voltage
5 V nom. 3 V to 5 V
Output Voltage Ripple
< 30 mV p-p
Switching Frequency (Fsw)
1000 kHz
SELECTING THE SWITCHING FREQUENCY
The first step is to decide on a switching frequency for the regulator. Typically, you want to choose the highest
switching frequency possible since this produces the smallest solution size. The high switching frequency allows
for lower valued inductors and smaller output capacitors compared to a power supply that switches at a lower
frequency. However, the highest switching frequency causes extra switching losses, which hurt the converter
’s
performance. The converter is capable of running from 300 kHz to 2 MHz. Unless a small solution size is an
ultimate goal, a moderate switching frequency of 1MHz is selected to achieve both a small solution size and a
high efficiency operation. Using Equation 9, R5 is calculated to be 180 k
. A standard 1% 182 k value was
chosen in the design.
Figure 34. High Frequency, 1.8 V Output Power Supply Design with Adjusted UVLO
OUTPUT INDUCTOR SELECTION
The inductor selected works for the entire TPS57114 -Q1 input voltage range. To calculate the value of the
output inductor, use Equation 22. KIND is a coefficient that represents the amount of inductor ripple current
relative to the maximum output current. The inductor ripple current is filtered by the output capacitor. Therefore,
choosing high inductor ripple currents impacts the selection of the output capacitor since the output capacitor
must have a ripple current rating equal to or greater than the inductor ripple current. In general, the inductor
ripple value is at the discretion of the designer; however, KIND is normally from 0.1 to 0.3 for the majority of
applications.
Copyright
2010–2011, Texas Instruments Incorporated
21
Product Folder Link(s): TPS57114 -Q1
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| TPS57140MDRCREP | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.8V 1 Output 1.5A 10-VFDFN Exposed Pad 制造商:texas instruments 系列:SWIFT?? 包裝:剪切帶（CT） 零件狀態(tài):有效 功能:降壓 輸出配置:正 拓撲:降壓 輸出類型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:3.5V 電壓 - 輸入（最大值）:42V 電壓 - 輸出（最小值/固定）:0.8V 電壓 - 輸出（最大值）:39V 電流 - 輸出:1.5A 頻率 - 開關(guān):100kHz ~ 2.5MHz 同步整流器:無 工作溫度:-55°C ~ 125°C（TA） 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應商器件封裝:10-VSON（3x3） 標準包裝:1 |
| TPS57140QDGQRQ1 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.5-42Vin,1.5A Step Down Cnvrtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)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 |
| TPS57140QDRCRQ1 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.5-42Vin,1.5A Step Down Cnvrtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)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 |
| TPS57160-Q1EVM | 功能描述:EVAL MODULE FOR TPS57160-Q1 制造商:texas instruments 系列:SWIFT??，Eco-Mode?? 零件狀態(tài):在售 主要用途:DC/DC，步降 輸出和類型:1，非隔離 電壓 - 輸出:5V 電流 - 輸出:1A 電壓 - 輸入:9 V ~ 16 V 穩(wěn)壓器拓撲:降壓 頻率 - 開關(guān):2MHz 板類型:完全填充 所含物品:板 使用的 IC/零件:TPS57160-Q1 標準包裝:1 |
| TPS57160QDGQRQ1 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3.5-60V,1.5A Step Down SWIFT Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)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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