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Power Supply SMPS SMPS (Switched Mode Power Supply) is responsible for power supply to pc. This unit converts the AC current into one or more levels of DC current that can be used by the computer. This unit regulates the input voltage and load variations. SMPS IC TT 494 – Used to maintain the SMPS Voltage – 5v to 12v DC/230V AC input DC – Using Rectifier Rectifiers and Transformers It generates : +5v – red , -5v – white +12v – Yellow , -12v – Blue Power good signal +5v – orange GND - Black Types of SMPS Fly Back mode SMPS This type of Smps is normally used in TVs and VCRs. It is relatively simple and cheap since it dies not need any output choke. But it has poor regulations and high ripple content in output. Forward mode SMPS Forward mode Smps units are used in devices requiring 100 to 200 watts of output power and good regulation. Push Pull mode SMPS If output power required is high and better regulation with low losses is required, push pull mode Smps is used. SMPS Block diagram of a mains operated AC–DC SMPS with output voltage regulation