Micropower Backup Power Supply Circuit of Voltage on Telephone Line

Published:2011/8/3 7:01:00 Author:Michel | Keyword: Telephone Line, Micropower, Backup, Power Supply Circuit | From:SeekIC

The micropower backup power supply circuit of voltage on telephone is as above.The input voltage Ui of micropower backup power supply absorbs from 24~28V telephone line and the input current is lower than 4μA.The output voltage U。of micropower backup power supply is 3.3V and the current is 1μA.In the circuit,VT1 and VT2 are current source and they provide about 3μA current for A1.A1 are reference voltage circuit and comparator circuit and the maximum static current consumption current is 0.6μA.



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