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参数资料
| 型号： | TPS5420MDREPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 5.2 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 3/23页 |
| 文件大小： | 658K |
| 代理商： | TPS5420MDREPG4 |
www.ti.com
Design Procedure
DVIN =
()
IOUT(MAX) x0.25
+IOUT(MAX)
MAX
xESR
CBULK
SW
x
(2)
SLVS717 – DECEMBER 2006
APPLICATION INFORMATION (continued)
The following design procedure can be used to select component values for the TPS5420. Alternately, the
SWIFT Designer Software may be used to generate a complete design. The SWIFT Designer Software uses an
iterative design procedure and accesses a comprehensive database of components when generating a design.
This section presents a simplified discussion of the design process.
To begin the design process, a few parameters must be determined. The designer must know the following:
Input voltage range
Output voltage
Input ripple voltage
Output ripple voltage
Output current rating
Operating frequency
Design Parameters
For this design example, use the following as the input parameters:
DESIGN PARAMETER(1)
EXAMPLE VALUE
Input voltage range
10 V to 35 V
Output voltage
5 V
Input ripple voltage
300 mV
Output ripple voltage
30 mV
Output current rating
2 A
Operating frequency
500 kHz
(1)
As an additional constraint, the design is set up to be small size and low component height.
Switching Frequency
The switching frequency for the TPS5420 is internally set to 500 kHz. It is not possible to adjust the switching
frequency.
Input Capacitors
The TPS5420 requires an input decoupling capacitor and, depending on the application, a bulk input capacitor.
The recommended value for the decoupling capacitor is 10
F. A high-quality ceramic type X5R or X7R is
required. For some applications, a smaller value decoupling capacitor may be used, if the input voltage and
current ripple ratings are not exceeded. The voltage rating must be greater than the maximum input voltage,
including ripple. For this design, two 4.7-
F capacitors, C1 and C4, are used to allow for smaller 1812 case size
to be used while maintaining a 50-V rating.
This input ripple voltage can be approximated by Equation 2 :
Where:
IOUT(MAX) = Maximum load current
fSW = Switching frequency
CI = Input capacitor value
ESRMAX = Maximum series resistance of the input capacitor
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS5420-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-A WIDE-INPUT-RANGE STEP-DOWN SWIFTa?￠ CONVERTER |
| TPS5420QDRQ1 | 功能描述:直流/直流开关调节器 2A Wide-Input-Range Step-Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54218 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2.95 V to 6 V Input 2 A Output 2MHz Synchronous Step Down Switcher With Integrated FETs (SWIFT) |
| TPS54218_12 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2.95 V to 6 V Input, 2 A Output, 2MHz, Synchronous Step Down |
| TPS54218EVM-511 | 功能描述:电源管理IC开发工具 Converter Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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