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參數資料
| 型號： | TPS54040DGQ |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.5 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數： | 22/47頁 |
| 文件大小： | 2435K |
| 代理商： | TPS54040DGQ |
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APPLICATION INFORMATION
Design Guide — Step-By-Step Design Procedure
Selecting the Switching Frequency
www.ti.com................................................................................................................................................................................................... SLVS918 – MARCH 2009
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
5.0 V
Transient Response 0 to 1.5A load step
ΔVout = 4%
Maximum Output Current
0.5 A
Input Voltage
34 V nom. 12V to 42 V
Output Voltage Ripple
1% of Vout
Start Input Voltage (rising VIN)
8.9 V
Stop Input Voltage (falling VIN)
7.9 V
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 130 ns for the TPS54040. For this example, the output voltage is 5.0 V
and the maximum input voltage is 42 V, which allows for a maximum switch frequency up to 1012 kHz when
including the inductor resistance, on resistance 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 41 to
determine the maximum switching frequency. With a maximum input voltage of 42 V, assuming a diode voltage
of 0.5 V, inductor resistance of 130m
, switch resistance of 400m, a current limit value of 0.94 A and a short
circuit output voltage of 0.1V. The maximum switching frequency is approximately 1055 kHz.
Choosing the lower of the two values and adding some margin a switching frequency of 700kHz is used. To
determine the timing resistance for a given switching frequency, use Equation 11 or the curve in Figure 39.
Figure 50. High Frequency, 5V Output Power Supply Design with Adjusted UVLO.
Copyright 2009, Texas Instruments Incorporated
29
Product Folder Link(s): TPS54040
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS54040DGQ | 制造商:Texas Instruments 功能描述:Power Management IC 制造商:Texas Instruments 功能描述:IC, STEP-DOWN CONVERTER, MSOP-10 |
| TPS54040DGQR | 功能描述:直流/直流開關轉換器 3.5V-42Vin,0.5A Step Down SWIFT Convrtr 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 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS54040EVM-456 | 功能描述:電源管理IC開發工具 0.5A,12-42V In SWIFT Cnvrtr Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54040EVM-456 | 制造商:Texas Instruments 功能描述:EVALUATION MODULE FOR TPS54040 SWIFT(TM) |
| TPS54040-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:0.5-A 42-V STEP-DOWN SWIFTa?￠ DC/DC CONVERTER WITH Eco-modea?￠ |
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