ELECTRONIC CIRCUIT CONTROL ELEMENT WITH TAP ELEMENT
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United States of America Patent
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app pub date -
Dec 2, 2013
filing date -
May 27, 2003
priority date (Note) -
Abandoned
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Abstract
An example control element for use in a power supply includes a first terminal, a power MOSFET, and a control circuit. The power MOSFET has a drain terminal, a source terminal, a control terminal, and a tap terminal. In operation, a voltage at the tap terminal is less than and tracks a voltage at the drain terminal when the voltage at the drain terminal is less than a pinch off voltage of the power MOSFET. The control circuit includes a PWM circuit and a start-up circuit. The PWM circuit provides a control signal to the power MOSFET to switch the power MOSFET on and off in response to the feedback signal. The start-up circuit charges a bypass capacitor at the first terminal in response to the voltage at the tap terminal until a voltage at the first terminal reaches a first voltage level.
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