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NCL30105
The critical components for layout are the following:
1. R2 (R toff ): This resistor sets the off time. The
placement of this resistor is such that the distance
to the pin and IC ground is minimized. The
footprints R1 and R3 are optional to increase the
precision of the resistance value.
2. C5 (C VCC ): This is the Vcc supply decoupling
capacitor. The placement of this capacitor is such
that the distance to the pin and IC ground is
minimized. The recommended minimum value for
this capacitor is 100 nF.
3. C8 (C SSTART ): This capacitor sets the soft ? start
time. The placement of this capacitor is such that
the distance to the pin and IC ground is
minimized.
The layout includes options to use a surface mount
inductor (footprint L2) and MOSFET (footprint M2).
http://onsemi.com
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