Page 219 - Make Your Own PCBs with EAGLE from Schematic Designs to Finished Boards
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FIGURE 9-7 Routing the power supply.
Referring again to Figure 9-5, pin 4 of IC2 is a feedback signal. It measures the voltage being
output. This will not be carrying any significant current, but the datasheet indicates that it should be
kept away from the inductor. This track can just travel out horizontally from pin 4 of IC2. It does not
need to be thick, but it does need to get past the track on the top layer from C2 to L1. We can do this
by hopping under it using a pair of vias.
When routing from one layer to another, do not place the vias first. They will be placed
automatically for you as you switch layers. This is illustrated in Figure 9-8.
