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MIC2145 low power POE flyback converter

Posted: 25 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:flyback converter? POE? skip mode controller?

The MIC2145 skip mode controller is used to implement a flyback converter that is intended for use in non-isolated, low power, POE applications. The circuit has a nominal 48V input and supports the POE voltage range of 36V to 57V.

The output voltage is 2.5V at 350mA. The maximum voltage rating of the MIC2145 is 16V. To get around the low voltage rating, transistor Q2, with a 100V rating, is connected in series with the switch pin of the MIC2145 to form a cascode configuration. Diode D6, clamps the voltage at the source of Q2 to Vdd (6V). The base of Q2 is always at Vdd potential. Q2 conducts when the MIC2145 switch pin goes low and turns off when the switch pin goes high.

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