Step-down controller circuit
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United States of America Patent
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Feb 12, 2008
Grant Date -
Apr 13, 2006
app pub date -
Oct 5, 2005
filing date -
Oct 13, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A step-down controller has an input having a first and a second input terminal for applying an input voltage, an output having a first and a second output terminal at which an output voltage can be provided, a series circuit including a switch and an inductance which is coupled between the first input terminal and the first output terminal. The switch has a control input for applying a control signal. A first diode is coupled between a junction point between the switch and the inductance and a reference potential such that, when the inductance is freewheeling, a current flow through the first diode (D.sub.1) is possible. There is a snubber network with a snubber capacitor, a second and third diode and an auxiliary inductance, a series circuit including the snubber capacitor, the third diode and the auxiliary inductance being coupled in parallel with the inductance.
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