ISL97686
4. The relatively quiet AGND area, to the right of the neck needs
to be traced out carefully in unbroken metal, via the shortest
possible path to the ground side of the components
connected to OVP, COMP, ISET, ACTL, PWM_SET/PLL, and
ACTL. This is also true for the filtering caps on PWMI and STV.
These are needed to reject noise and cause decoding errors
in some conditions.
5. The current sensing line is shielded by a metal trace, coming
6. The filtering cap of the current sensing line should be placed
close to the CS pin rather than in the area of current sense
resistor, as it needs to couple this pin to the adjacent PGND pin.
7. The noisy switching FET should be kept far away from the
quiet pin area.
8. The area on the switching node should be determined by the
dissipation requirements of the boost power FET.
from its source, to prevent pickup from the GD pin beside it.
PVIN
PGND
INDUCTOR
DIODE
PGND
VOUT
FIGURE 23. EXAMPLE OF TWO LAYER PCB LAYOUT
18
FN7953.0
April 23, 2012
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