1. High frequency pcb design requires careful grounding. Use ground

circuit. Try to make most of signal ground connections through vias

rather then through PC traces.


  1. For each power supply stage, keep power ground and control ground

them together [If they are electrically connected] in one point near DC

given stage.


  1. Minimize areas and lengths of loops which contain high frequency


  1. Place capacitors that bypass supply voltage and reference pins of



  1. Place filter capacitors so that their terminals physically go right into

board  traces that carry mainstream of the current to be filtered.


  1. When doing PCB layout try to use symmetrical routing for paralleled


  1. Choose the width of circuit board traces based on the rated current

temperature rise. Make sure however that the PC trace will not fuse

(such as short circuit current) that could develop in the circuit.


  1. PWB creepage and clearance between primary circuits, secondary

ground should be determined according to the requirements of applicable

example, in a typical commercial application with 120-230 VAC input,

rimary and secondary circuitry per UL 60950 or IEC 60950 should be 6.4mm min


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