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The ISL6719 is a low cost linear regulator for generaTIng a low voltage bias supply from intermediate distributed voltages commonly used in telecom and datacom applicaTIons. It provides a single adjustable output rated at 100mA from either the input source or an auxiliary source such as a transformer winding. The auxiliary source is selected whenever it has sufficient voltage to sustain the output.The ISL6719 may be used as a start-up or a conTInuous lowpower regulator. When operaTIng as a start-up regulator, it iscapable of sourcing 100mA from a 100V source for shortdurations. This period of time allows the power supply to start-up and provide an alternate power source, such as the output of a transformer winding, to the AUXIN input. This allows the regulated output to operate from a lower source voltage to minimize power loss.
