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| 型号： | NCP5425DBR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 21/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 20TSSOP |
| 产品变化通告： | Product Obsolescence 14/Apr/2010 |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 938kHz |
| 占空比： | 100% |
| 电源电压： | 4.75 V ~ 13.2 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | NCP5425DBR2OS |
NCP5425
EMI MANAGEMENT
As a consequence of large currents being turned on and off
at high frequency, switching regulators generate noise
during normal operation. When designing for compliance
with EMI/EMC regulations, additional components may be
the optimum approach to reducing susceptibility to
noise. Use the two internal layers as the power and
GND planes, the top layer for power connections
and component vias, and the bottom layers for the
noise sensitive traces.
necessary to reduce noise emissions. These components are
not required for regulator operation and experimental results
may allow them to be eliminated. The input filter inductor
may not be required because bulk filter and bypass
capacitors, as well as other loads located on the board will
tend to reduce regulator di/dt effects on the circuit board and
input power supply. Placement of the power components to
minimize routing distance will also help to reduce
emissions.
LAYOUT GUIDELINES
When laying out a buck regulator on a printed circuit
board, the following checklist should be used to ensure
proper operation of the NCP5425.
1. Rapid changes in voltage across parasitic capacitors
and abrupt changes in current in parasitic inductors
are major concerns.
2. Keep high currents out of sensitive ground
connections.
3. Avoid ground loops as they pick up noise. Use star
or single point grounding.
4. For high power buck regulators on double?sided
PCB’s a single ground plane (usually the bottom)
is recommended.
5. Even though double sided PCB’s are usually
sufficient for a good layout, four?layer PCB’s are
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Keep the inductor switching node small by placing
the output inductor, switching and synchronous
FETs close together.
The MOSFET gate traces to the IC must be short,
straight, and wide as possible.
Use fewer, but larger output capacitors, keep the
capacitors clustered, and use multiple layer traces
with wide, thick copper to keep the parasitic
resistance low.
Place the switching MOSFET as close to the input
capacitors as possible.
Place the output capacitors as close to the load as
possible.
Place the COMP capacitor as close as possible to
the COMP pin.
Connect the filter components of pins R OSC, V FB ,
V OUT , and COMP, to the GND pin with a single
trace, and connect this local GND trace to the
output capacitor GND.
Place the V CC bypass capacitors as close as possible
to the IC.
Place the R OSC resistor as close as possible to the
R OSC pin.
Assign the output with lower duty cycle to
channel 2, which has inherently better noise
immunity.
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5425DBR2G | 功能描述:DC/DC 开关控制器 Dual Synchronous Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| NCP5425DOEVB | 功能描述:电源管理IC开发工具 ANA SW REG EVAL BRD 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 |
| NCP5425S0EVB | 制造商:ON Semiconductor 功能描述: |
| NCP5425SOEVB | 功能描述:电源管理IC开发工具 ANA SW REG EVAL BRD 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 |
| NCP5426 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:AC-DC Offline Switching Controllers/Regulators |
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