Pulse width modulator (PWM) with high duty cycle using bootstrap capacitor
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United States of America Patent
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Jun 12, 2001
Grant Date -
N/A
app pub date -
Jul 6, 1998
filing date -
Jul 6, 1998
priority date (Note) -
Expired
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Abstract
A pulse width modulation (PWM) amplifier of the type including power transistors connected in totem-pole fashion and a bootstrap capacitor used to bias at least one of the power transistors into the conductive state. The improvement wherein the bootstrap capacitor is refreshed only to the extent needed to provide a higher effective maximum duty cycle.
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