參數(shù)資料
型號(hào)： TPS54320RHLR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1320 kHz SWITCHING FREQ-MAX, PQCC14
封裝： 3.50 X 3.50 MM, GREEN, PLASTIC, QFN-14
文件頁(yè)數(shù)： 14/39頁(yè)
文件大?。?/td> 1358K
代理商： TPS54320RHLR
www.ti.com
SLVS982A – AUGUST 2010 – REVISED SEPTEMBER 2010
APPLICATION INFORMATION
Design Guide – Step-By-Step Design Procedure
This example details the design of a high frequency switching regulator 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 start with the following known parameters:
PARAMETER
VALUE
Output Voltage
3.3 V
Output Current
3 A
Transient Response 0.75 A (25%) load step
ΔVOUT = 4 %
Input Voltage
12 V nominal, 8 V to 17 V
Output Voltage Ripple
1% (33 mVPP)
Start Input Voltage (Rising Vin)
6.806 V
Stop Input Voltage (Falling Vin)
4.824 V
Switching Frequency
480 kHz
Typical Application Schematic
The application schematic of Figure 34 was developed to meet the requirements above. This circuit is available
as the TPS54320EVM-513 evaluation module. The design procedure is given in this section. For more
information about Type II and Type III frequency compensation circuits, see Designing Type III Compensation for
Current Mode Step-Down Converters (SLVA352) and Design Calculator (SLVC219).
Figure 34. Typical Application Circuit
Operating Frequency
The first step is to decide on a switching frequency for the regulator. There is a trade off between higher and
lower switching frequencies. Higher switching frequencies may produce a smaller solution size using lower
valued inductors and smaller output capacitors compared to a power supply that switches at a lower frequency.
However, the higher switching frequency causes additional switching losses, which negatively impact the
converter’s efficiency and thermal performance. In this design, a moderate switching frequency of 480kHz is
selected to achieve both a small solution size and a high efficiency operation. This frequency is set using the
resistor at the RT/CLK pin (R3). Using Equation 4, the resistance required for a switching frequency of 480kHz is
102 k
Ω. A 100kΩ resistor is used for this design.
Copyright 2010, Texas Instruments Incorporated
21
Product Folder Link(s) :TPS54320
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TPS54320RHLT 制造商:Texas Instruments 功能描述:IC SYNC STEP-DOWN CONTROLLER 1.2MHZ Q 制造商:Texas Instruments 功能描述:IC, SYNC STEP-DOWN CONTROLLER, 1.2MHZ, QFN-14
TPS54325 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5-V to 18-V, 3-A OUTPUT SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET (SWIFT?)
TPS54325_10 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5-V to 18-V, 3-A OUTPUT SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET (SWIFT?)
TPS54325EVM 功能描述:電源管理IC開發(fā)工具 5-17V Input 3A SWIFT CVTR Eval RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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