Constant current and voltage controller in a three-pin package with dual-use switch pin
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United States of America Patent
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-
Jan 3, 2012
Grant Date -
Dec 3, 2009
app pub date -
May 30, 2008
filing date -
May 30, 2008
priority date (Note) -
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Abstract
A flyback converter includes a controller integrated circuit (IC) housed in an IC package with only three terminals. The controller IC is grounded through a ground terminal. A feedback signal is received onto a power terminal. The feedback signal powers the controller IC and is derived from a voltage across an auxiliary inductor of the flyback converter. A switch terminal is coupled to an inductor switch that is turned on by a switch control signal having a frequency and a pulse width. The inductor switch controls the current that flows through a primary inductor of the flyback converter. A switch signal is received onto the switch terminal and is used to generate the inductor switch control signal. The controller IC adjusts the frequency in a constant current mode such that output current remains constant and adjusts the pulse width in a constant voltage mode such that output voltage remains constant.
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