NCP1573D ONSEMI [ON Semiconductor], NCP1573D Datasheet - Page 16

• Manufacturer Part Number: NCP1573D
• Description: Low Voltage Synchronous Buck Controller
• Manufacturer: ONSEMI [ON Semiconductor]

Layout Considerations
1. The fast response time of V
2. The COMP capacitor (shown below as C13)
3. The V
the IC’s sensitivity to noise on the V
Fortunately, a simple RC filter, formed by the
feedback network and a small capacitor (100 pF
works well, shown below as C6) placed between
V
system practically immune to jitter. This capacitor
should be located as close as possible to the IC.
should be connected via its own path to the IC
ground. The COMP capacitor is sensitive to the
intermittent ground drops caused by switching
currents. A separate ground path will reduce the
potential for jitter.
shown below as C4) should be located as close as
possible to the IC. This capacitor’s connection to
GND must be as short as possible. The 10 Ω
resistor (shown below as R3) should be placed
close to the V
FB
and GND, filters out most noise and provides a
CC
bypass capacitor (0.1 μF or greater,
CC
pin.
2
technology increases
FB
line.
http://onsemi.com
16
V
OUT
4. The IC should not be placed in the path of
GND
switching currents. If a ground plane is used, care
should be taken by the designer to ensure that the
IC is not located over a ground or other current
return path.
R4
R6
C4
R3
12 V PWRGD
Figure 26.
U1
C6
R1
C13
5 V
C12