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certain period of time. Failure of the switching transistor is common. Ideal switching elements (e.g., transistors operated outside of their active mode) have no resistance when "closed" and carry no current when "open", and so the converters can theoretically operate with 100% efficiency (i.e., all input power is delivered to the load; no power is wasted as dissipated heat). selection. Home Tutorial Topologies SMPS design Software PCB design Computer PSU UPS Circuit Transformers Formulas EE Reference Inverters Thermal design Generators Solar . i got it thanks 4 your help reply its not enough Submitted by sundharapandian on Sun, 16/09/2012 - 12:20 its not enough reply how to check the smps not Submitted by jaghankeer on Wed, 26/09/2012 - 11:26 how to check the smps not work reply I Have Repaired these things Submitted by RICKY THE ELEC. Switching losses in the transistors (especially in the short part of each cycle when the device is partially on), on-resistance of the switching transistors, equivalent series resistance in the inductor and capacitors, and core losses in the inductor, and rectifier voltage drop contribute to a typical efficiency of 6070%. Due to their high volumes mobile phone chargers have always been particularly cost sensitive. Failure modes.