11 CIRCUIT OPERATION
11.1. POWER SUPPY CIRCUIT
11.1.1. The function of the power unit are listed below
AC-DC Inverter Function This function isolates and transduces the AC input voltage to
DC input and output of DC27V.
DC-DC Converter Function This function outputs DC+15V, -15V and 3.3V from the
inputted DC27V.
Ringing Signal Output Function Based on the 20/25Hz sine wave signal output from KX-
TES824/KX-TEM824, this function generates ringing and
supplies to the system.
AC Power Failure Detection This function detects any cut off of the AC power supply and
outputs an AC alarm signal to the CPU.
Battery Back Up Adaptor Function This function connects battery and service unit without battery
adaptor, only needs a cable connected to the battery and
service unit.
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KX-TES824LA / KX-TEM824LA /
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