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參數(shù)資料
| 型號： | LPO4812 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Up to 500 mA, High Efficiency Synchronous Step-Down DC-DC Converter |
| 中文描述： | 多達500個，高效率同步降壓毫安型DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 162K |
| 代理商： | LPO4812 |
NCP1511
http://onsemi.com
13
PCB Layout Recommendations
Good PCB layout plays an important role in switching
mode power conversion. Careful PCB layout can help to
minimize ground bounce, EMI noise and unwanted feedback
that can affect the performance of the converter. Hints
suggested below can be used as a guideline in most situations.
1. Use starground connection to connect the IC ground
nodes and capacitor GND nodes together at one point.
Keep them as close as possible. And then connect this to the
ground plane through several vias. This will reduce noise
in the ground plane by preventing the switching currents
from flowing through the ground plane.
2. Place the power components (i.e., input capacitor,
inductor and output capacitor) as close together as possible
for best performance. All connecting traces must be short,
direct, and wide to reduce voltage errors caused by resistive
losses through the traces.
3. Separate the feedback path of the output voltage from
the power path. Keep this path close to the NCP1511
circuit. And also route it away from noisy components.
This will prevent noise from coupling into the voltage
feedback trace.
4. Place the DCDC converter away from noise sensitive
circuitry, such as RF circuits.
The following shows the NCP1511 demo board layout
and bill of materials:
Figure 27. Top and Silkscreen Layer
Figure 28. Soldermask Top and Silkscreen Layer
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