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参数资料
| 型号： | IRDC3871 |
| 厂商： | International Rectifier |
| 文件页数： | 14/21页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR IRDC3871 |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.05V |
| 电流 - 输出： | 8A |
| 输入电压： | 12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3871 |
IR3871MPBF
COMPONENT SELECTION
Selection of components for the converter is an
iterative process which involves meeting the
INPUT CAPACITOR SELECTION
The main function of the input capacitor bank is
specifications
and
trade-offs
between
to provide the input ripple current and fast slew
performance and cost. The following sections will
guide one through the process.
INDUCTOR SELECTION
Inductor selection involves meeting the steady
state output ripple requirement, minimizing the
switching loss of upper MOSFETs, meeting
transient response specifications and minimizing
the output capacitance. The output voltage
includes a DC voltage and a small AC ripple
component due to the low pass filter which has
rate current during the load current step up. The
input capacitor bank must have adequate ripple
current carrying capability to handle the total
RMS current. Figure 21 shows a typical input
current. Equation 6 shows the RMS input
current. The RMS input current contains the DC
load current and the inductor ripple current. As
shown in equation 5, the inductor ripple current
is unrelated to the load current. The maximum
RMS input current occurs at the maximum
output current. The maximum power dissipation
incomplete
attenuation
of
the
switching
in the input capacitor equals the square of the
harmonics. Neglecting the inductance in series
with the output capacitor, the magnitude of the AC
voltage ripple is determined by the total inductor
ripple current flowing through the total equivalent
maximum RMS input current times the input
capacitor’s total ESR.
series resistance (ESR) of the output capacitor
bank.
Input Current
I OUT
Δ I
ΔI ?
T ON ? ? V IN ? V OUT ?
2 ? L
(5)
T S
Figure 21. Typical Input Current Waveform.
One can use equation 5 to find the required
inductance. Δ I is defined as shown in Figure 21.
? f 2 ? t ? ? dt
1
The main advantage of small inductance is
increased inductor current slew rate during a load
transient, which leads to a smaller output
capacitance requirement as discussed in the
I IN_RMS ?
Ts
Ts ? 0
? I OUT ? Ton ? Fs ? 1 ? ? ?
?
Output Capacitor Selection section. The draw
back of using smaller inductances is increased
switching power loss in upper MOSFET, which
1 ? ΔI ?
3 ? I OUT ?
2
(6)
reduces the system efficiency and increases the
thermal dissipation.
The voltage rating of the input capacitor needs
to be greater than the maximum input voltage
because of high frequency ringing at the phase
node. The typical percentage is 25%.
14
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相关代理商/技术参数 |
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| IRDC3876 | 制造商:International Rectifier 功能描述:9999V 999.000A POL IC - Rail/Tube 制造商:International Rectifier 功能描述:BOARD EVAL FOR IR3876 |
| IRDC3894 | 功能描述:电源管理IC开发工具 Design Kit Featuring IR3894M 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 |
| IRDC3895 | 功能描述:电源管理IC开发工具 Design Kit Featuring IR3895M 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 |
| IRDC3897 | 功能描述:电源管理IC开发工具 Design Kit POL IC 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 |
| IRDC3897-P1V2 | 制造商:IRF 制造商全称:International Rectifier 功能描述:USER GUIDE FOR IR3897 EVALUATION BOARD |
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