Switching power supply PCB layout 8 major points summary, power circuit and control circuit example analysis

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/ 2019-07-12 / News

8 big points:

1) The capacitance of the bypass ceramic capacitor should not be too large, and its parasitic series inductance is as small as possible. Multiple capacitors in parallel can improve the impedance characteristics of the capacitor;

2) The parasitic shunt capacitance of the inductor should be as small as possible, and the distance between the inductor pin pads should be as far as possible;

3) Avoid placing any power or signal traces on the ground;

4) The area of the high frequency loop should be reduced as much as possible;

5)vias placement should not disrupt the path of high frequency currents on the formation;

6) Different circuits on the system board require different ground planes, and the ground planes of different circuits are connected to the power ground plane through a single point;< /p>

7) The drive circuit loop of the control chip to the upper and lower FETs should be as short as possible;

8) Switching power supply circuit and control signal circuit components need to be connected to different ground planes. These two ground layers are usually connected by a single point.

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Keywords: PCB layout
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