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NCP1521 Datasheet(PDF) 12 Page - ON Semiconductor

Part No. NCP1521
Description  1.5 MHz, 600 mA, High−Efficiency, Low Quiescent Current, Adjustable Output Voltage Step−Down Converter
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1521 Datasheet(HTML) 12 Page - ON Semiconductor

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NCP1521
http://onsemi.com
12
APPLICATION BOARD
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 star−ground 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
NCP1521 circuit. And also route it away from
noisy components. This will prevent noise from
coupling into the voltage feedback trace.
4. Place the DC−DC converter away from noise
sensitive circuitry, such as RF circuits.
The following shows the NCP1521 demo board
schematic, layout, and bill of materials:
GND
2
VIN
1
EN
3
LX
5
FB
4
OFF ON
VIN
CIN
COUT
R1
R2
Cff
L
VOUT
Figure 27. NCP1521 Board Schematic
Figure 28. NCP1521 Board Layout


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