Within switching power supplies, there are two further subgroups, synchronous and conventional. The synchronous is more efficient and costly and will be used to get as much power from the The linear regulator is the lowest-cost and highest-density option for generating lower voltages from the 5-V USB. input current of the power supply. • Diodes tend to "snap off" when there is no PFC stage, since they turn off abruptly at the end of each charging peak. • Popular configuration for these voltages---two secondaries, with a lower voltage output derived from the 5 V output using a mag amp postregulator. How to Convert ATX PSU (PC power supply unit) into a cheap bench top power supply which can be used to power many different types of electronics circuits. Is it possible to use an ATX power supply unit or PSU from an old PC as a bench top power supply to power 5V logic, but with some limitations. If your 5V power supply is reasonably well designed, do not worry. Most electronic parts rated for 5V will work fine at 5+/- 10%; 4.5 to 5.5V. Re: TVS for 5V power supply ? I can see from datasheet Vclamp is 10V, Good enough I reckon for protecting my board, I combine it with fast blow fuse. It provides constant voltage power source with TO-220 4 lead full mold package. Dropout voltage of KA78R05 is below 0.5V in full rated current(1A). This regulator has various function such as peak current protection, thermal shut down, overvoltage protection and output disable function. content into one desktop power supply design guide l CFX12V content derived from revision 1.2. n Updated 12V1 current for 300 W configuration n Updated In order to meet the 2010 and 2013 ErP Lot 6 requirements and 2014 ErP Lot 3 requirements, 5V standby efficiency should be met as shown in Here is a quick video showing how I power up my Atomic Pi and some considerations to make when powering up this unit. Check out the file for my enclosure