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| Eight noted basic elements of switching Power Supply PCB layout |
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Point 1, the bypass capacitance ceramic capacitors can not be too large, and its parasitic series electric induction as small as possible, a plurality of capacitors in parallel can be improved the impedance characteristics of capacitors;
Point 2, the parasitic inductance of the shunt capacitance should be as small as possible, it is better for the farther away from the pin inductance between the pads.
Point 3, avoid placing any power or signal traces on the ground;
Point 4, the high-frequency loop area should be reduced as small as possible;
Point 5, via placed should not be destroyed a high-frequency current of the trace on the ground ;
Point 6, the system board with a small circuit requires a different ground plane, the ground floor with a small circuit by a single point and the ground layer are connected;
Point 7, The Loop of control circuit chip to the top and buttom FET should be as short as possible
Point 8, the switching power supply circuit and the small components that control signal circuit what need to connect to the ground plane, these two formations are generally connected by a single point.
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