Switching circuit using closed control loop to precharge gate of switching transistor and stable open loop to switch the switching transistor
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United States of America Patent
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May 25, 2010
Grant Date -
Dec 21, 2006
app pub date -
Jun 20, 2005
filing date -
Jun 20, 2005
priority date (Note) -
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Abstract
A switching circuit that transitions using a switch transistor. During the initial stages of a high-low transition, a control loop provides supplemental pre-charge to the gate of the switch transistor to reduce high-low switching delays. Once the current flowing through the switch transistor rises to a level causing the output voltage to change at specified speed threshold, a loop opening mechanism opens the loop. Further opening of the switch transistor in the high-low transition is taken care of by a relatively constant current source. At that point, no or negligible feedback current is used to charge the gate of the switch transistor. Low-high transitions may be performed in a similar complementary manner.
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