VLCF4020-6R8 ONSEMI [ON Semiconductor], VLCF4020-6R8 Datasheet - Page 13

• Manufacturer Part Number: VLCF4020-6R8
• Description: Up to 500 mA, High Efficiency Synchronous Step-Down DC-DC Converter
• Manufacturer: ONSEMI [ON Semiconductor]

PCB Layout Recommendations
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.
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.
inductor and output capacitor) as close together as possible
Good PCB layout plays an important role in switching
1. Use star−ground connection to connect the IC ground
2. Place the power components (i.e., input capacitor,
Figure 28. Soldermask Top and Silkscreen Layer
Figure 27. Top and Silkscreen Layer
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NCP1511
13
for best performance. All connecting traces must be short,
direct, and wide to reduce voltage errors caused by resistive
losses through the traces.
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.
circuitry, such as RF circuits.
and bill of materials:
3. Separate the feedback path of the output voltage from
4. Place the DC−DC converter away from noise sensitive
The following shows the NCP1511 demo board layout