+5V 4W switching power supply circuit composed of single chip TOP210

Published:2011/4/21 2:21:00 Author:May | Keyword: +5V 4W, switching power supply | From:SeekIC

+5V 4W switching power supply circuit composed of single chip TOP210 is shown in the diagram. DC input voltage Ui is got after 85~265V AC rectifying and filtering. The voltage adjustment rate of this switching power supply is Sv=±1.5％ (input DC voltage is 104~370V), load adjustment rate Si=±5％ (load current changes from 10% to 100%), output ripples voltage is ±25mV. When the lead wire of Ui and TOP210 is shorter, it also can save IC. Clamping protection circuit consists of VDz and VD1. After the secondary voltage rectifying and filtering by VD2, C2, L and C3, it can get +5V, 0.8A output. Feed back winding first rectifying by VD3, than it is smoothed filtering by R and C4 and offer control end current to TOP210.



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