Power transistor driving circuits and methods for switching mode power supplies
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United States of America Patent
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Dec 13, 2016
Grant Date -
Aug 29, 2013
app pub date -
Apr 12, 2013
filing date -
Nov 20, 2009
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Abstract
A power supply controller is provided for providing a drive current to a control terminal of a power transistor in three time intervals. The controller includes control circuits configured to control the drive current in multiple stages. During a first time interval, first drive current includes a current spike for turning on the power transistor in response to a start of the control signal pulse. During a second time interval, a second drive current includes a ramping current substantially proportional to a magnitude of a current through the power transistor. During a third time interval, current flow to the power transistor is at least partially turned off before an end of the control signal pulse.
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