Systems and methods for maintaining minimum pulse width during shutdown
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United States of America Patent
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Oct 14, 2008
Grant Date -
Sep 20, 2007
app pub date -
Mar 16, 2007
filing date -
Mar 17, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Systems and methods for preventing violations of minimum pulse width requirements that may cause damage to PWM amplifiers. One embodiment comprises a digital PWM amplifier that includes shutdown circuitry which is configured to identify blockout intervals during which deassertion of the PWM signals would cause the generation of below-minimum-width pulses in the signals. Each blockout interval may, for example, begin 1 minimum pulse width before and end 1 minimum pulse width after a rising/falling edge the PWM signals. If a shutdown signal is asserted (or deasserted) during one of the blockout intervals, the PWM signals are deasserted (or reasserted) at the end of the blockout interval.
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