What aspects should be paid attention to in the design of LED driver power PCB board?
Release time:
Apr 27,2023
Establish component parameters from schematic diagram to PCB design process - Input principle network table - Design parameter settings - Manual layout - Manual wiring - Verify design - Review - CAM output.
1、 Establish component parameters from schematic diagram to PCB design process - Input principle network table - Design parameter settings - Manual layout - Manual wiring - Verify design - Review - CAM output.
2、 The spacing between adjacent conductors in parameter setting must meet the requirements of Electrical safety, and in order to facilitate operation and production, the spacing should also be as wide as possible. The minimum spacing should be at least suitable for the voltage it can withstand. When the wiring density is low, the spacing between signal lines can be appropriately increased. For signal lines with significant differences between high and low levels, the spacing should be as short and increased as possible. Generally, the wiring spacing should be set to 8mil.
The distance from the edge of the inner hole of the solder pad to the edge of the PCB should be greater than 1mm, which can avoid causing solder pad defects during processing. When the wiring connected to the pad is thin, the connection between the pad and the wiring should be designed as a water droplet shape. This has the advantage that the pad is not easy to peel, and the wiring is not easily disconnected from the pad.
3、 The practice of component layout has proven that even if the circuit schematic design is correct and the printed circuit board design is inappropriate, it can have a negative impact on the reliability of electronic equipment. For example, if two thin parallel lines on a PCB are very close together, it will cause a delay in the signal waveform and generate reflected noise at the end of the transmission line; The interference caused by inadequate consideration of power and ground wires can lead to a decrease in product performance. Therefore, when designing printed circuit boards, attention should be paid to using the correct methods.
4、 The wiring switch power supply contains high-frequency signals, and any printed wire on the PCB can act as an antenna. The length and width of the printed wire will affect its impedance and inductance, thereby affecting frequency response. Even printed wires that pass through DC signals can couple from adjacent printed wires to RF signals and cause circuit problems (even radiating interference signals again).
5、 After completing the wiring design inspection, it is necessary to carefully check whether the wiring design complies with the rules formulated by the designer, and also confirm whether the rules formulated meet the requirements of PCB production process. Generally, the distance between wires and wires, wire and component solder pads, wire and through hole, component solder pads and through hole, and through hole and through hole is reasonable and meets production requirements. Is the width of the power cord and ground wire appropriate, and is there any area in the PCB where the ground wire can be widened. Note: Some errors can be ignored, such as some connectors with a portion of the outline placed outside the board frame, which may cause errors when checking the spacing; In addition, every time the wiring and vias are modified, they must be re coated with copper.
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