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參數(shù)資料
| 型號： | TPS54260DGQR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | GREEN, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 21/49頁 |
| 文件大?。?/td> | 1808K |
| 代理商： | TPS54260DGQR |
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SLVSA86A – MARCH 2010 – REVISED DECEMBER 2010
www.ti.com
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.
A few parameters must be known in order to start the design process. These parameters are typically determined
at the system level. For this example, we will start with the following known parameters:
Output Voltage
3.3 V
Transient Response 0 to 1.5A load step
ΔVout = 3 %
Maximum Output Current
2.5 A
Input Voltage
12 V nom. 10.8 V to 13.2 V
Output Voltage Ripple
1% of Vout
Start Input Voltage (rising VIN)
6.0 V
Stop Input Voltage (falling VIN)
5.5 V
Selecting the Switching Frequency
The first step is to decide on a switching frequency for the regulator. Typically, the user will want to choose the
highest switching frequency possible since this will produce 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. The switching frequency that can be selected is limited by the minimum on-time of
the internal power switch, the input voltage and the output voltage and the frequency shift limitation.
Equation 12 and Equation 13 must be used to find the maximum switching frequency for the regulator, choose
the lower value of the two equations. Switching frequencies higher than these values will result in pulse skipping
or the lack of overcurrent protection during a short circuit.
The typical minimum on time, tonmin, is 135 ns for the TPS54260. For this example, the output voltage is 3.3 V
and the maximum input voltage is 13.2 V, which allows for a maximum switch frequency up to 2247 kHz when
including the inductor resistance, on resistance output current and diode voltage in Equation 12. To ensure
overcurrent runaway is not a concern during short circuits in your design use Equation 13 or the solid curve in
Figure 40 to determine the maximum switching frequency. With a maximum input voltage of 13.2 V, assuming a
diode voltage of 0.7 V, inductor resistance of 26 m
, switch resistance of 200 m, a current limit value of 3.5 A
and a short circuit output voltage of 0.2 V. The maximum switching frequency is approximately 4449 kHz.
For this design, a much lower switching frequency of 300 kHz is used. To determine the timing resistance for a
given switching frequency, use Equation 11 or the curve in Figure 39.
The switching frequency is set by resistor R3 shown in Figure 49 For 300 kHz operation a 412 kΩ resistor is
required.
28
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54260
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相關代理商/技術(shù)參數(shù) |
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| TPS54260DRCR | 功能描述:直流/直流開關轉(zhuǎn)換器 3.5V-60Vin,2.5A,2.5 MHz Step Down SWIFT 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 |
| TPS54260DRCT | 功能描述:直流/直流開關轉(zhuǎn)換器 3.5V-60Vin,2.5A,2.5 MHz Step Down SWIFT 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 |
| TPS54260EVM-597 | 功能描述:電源管理IC開發(fā)工具 2.5A,10.8-13.2Vin SWIFT Conv 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 |
| TPS54260MDGQTEP | 功能描述:IC REG BUCK ADJ 2.5A 10MOSP 制造商:texas instruments 系列:Eco-Mode? 包裝:剪切帶（CT） 零件狀態(tài):在售 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）:60V 電壓 - 輸出（最小值/固定）:0.8V 電壓 - 輸出（最大值）:60V 電流 - 輸出:2.5A 頻率 - 開關:100kHz ~ 2.5MHz 同步整流器:無 工作溫度:-40°C ~ 150°C（TJ） 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 供應商器件封裝:10-MSOP-PowerPad 標準包裝:1 |
| TPS54260MDRCTEP | 功能描述:IC REG BUCK ADJ 2.5A 10VSON 制造商:texas instruments 系列:Eco-Mode? 包裝:剪切帶（CT） 零件狀態(tài):在售 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）:60V 電壓 - 輸出（最小值/固定）:0.8V 電壓 - 輸出（最大值）:60V 電流 - 輸出:2.5A 頻率 - 開關:100kHz ~ 2.5MHz 同步整流器:無 工作溫度:-40°C ~ 150°C（TJ） 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 |
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