TOP232Y 3 road output switching supply circuit diagram

Published:2011/3/24 3:24:00 Author:Ecco | Keyword: output switching supply | From:SeekIC

The TOP232 Y is used as four-terminal device. The efficiency of the power supply is 78%, the peak-crest value of output is 50 mv. Applied a single slab TOP232 Y, the total output of circuitry is 17.05 W. The d.c.inputs in the range of 200~375 V and 220 V/110 V. It needs to connect to rectifier filters, but no need to apply to input voltage doubler which make doubly rectification to 110 V voltage. The design develops soft start of TOP232 and undervoltage protection well, it has strict current limiting characteristic and high switch frequency characteristic, to make the magnetic core EE19 choosen by high - frequency transformer. Besides, TOP232 Y raises the spacing between the high pressure leak extreme and low-pressure port and lets up the electric leakage of pins, therefore power supply can used under worse environment. C1 is a type of d.c high frequency decoupling capacitance, and neglected when Ui is near from waiting source. The measuring resistance R1 could apply in settling the value of voltage UUV. When Rl=3.9MΩ, UUv=IUVRl=50μA×3.9MΩ=195V. When Ui<195 V, the supply will be cut off automaticly until Ui>195V.



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