Seektronics

  1. T ransformer drawings, PCB , schematic diagrams of the three transformer fly-by-wire bit number need to be one.   Reason: Safety certification requirements   This is a fault that many engineers will make when applying for safety certification submission.   2. The discharge resistor of X capacitor should be put in two sets.   Reason: UL62368, CCC certification requires to disconnect a group of resistors  and test the residual voltage of X capacitor   Many novices will make a mistake, and the only way to correct it is to change the PCB Layout  again, which will waste our time and the procurement of samples.   3. The PCB  aperture of transformer flyline shall take into account the maximum flyline diameter. If necessary, two groups of large and small PCB holes shall be reserved.   Reason: to avoid assembly  difficulties or furnace empty welding problems   Because safety application certification usually has a series, such as 24W application for a series, which contains 4.2V-36V volt