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Dual output switching regulated power supply

2014-11-07 07:37  
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Dual output switching regulated power supply
The circuit diagram of 15W switching regulated power supply with +5V (3A) main output and +3.3V (0.1A) alternative output is shown in the following diagram. This power supply adopts one piece of TOP223Y type single chip switching power supply with TO-220 packaging. Its maximum output power is 30W. It can use the power supplyfor printer and monitor. If the main power supply is +3.3V, it can be used for the switching power supply of notebook. The input voltage range of this power supply is 85~265V. The voltage regulation factor is ±0.7%, load regulation factor is +1.1%, power supply efficiency η>70%. The features of this power supply is shown in the following: (1) it can output +5V, +3.3V two loads isolation stable voltage at the same time; (2)It can further improve the stability of _5V and +3.3V output voltage to add one piece adjustable precision parallel voltage regulator IC3 (TL431) ; (3)it adds RC absorb circuit composed of C11, R7 to eliminate high frequency self-oscillation and decrease radio frequency interference (RFI).