Power Supply Circuit of Modem User Interface Circuit

Published:2011/7/22 22:02:00 Author:Michel | Keyword: Modem User Interface, Power Supply Circuit | From:SeekIC

The above picture is power supply circuit of modem user interface circuit.The circuit consists of single power switch and control integrated circuit etc.It provides the multiple output voltage, power switch can also use N channels MOSFET of low voltage.The input power comes from different output power of AC adapter or the regualted power of parts of the system.UCC3813-5 is power control device and it controls output voltage via contolling VT1 dutyfactor and it provides reference voltage for inverse amplifier of error signal.UCC3813-5 can realize current control mode and the voltage control method.The biggest characteristic of this circuitis to use a control circuit and a MOSFET to provide two telephones voltage.



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