Driver for piezoelectric actuator
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United States of America Patent
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Issued Date -
May 26, 2011
app pub date -
Nov 24, 2009
filing date -
Nov 24, 2009
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Abandoned
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Abstract
A driver for a piezoelectric actuator includes a pulse width modulator and an output amplifier packaged as a single semiconductor device, preferably on a single semiconductor die. The driver includes a first boost converter that supplies power to the output amplifier, which preferably has programmable gain. A second amplifier, for driving the gate of a switching transistor in the first boost converter, is powered by a second boost converter. The piezoelectric actuator provides tactile feedback for the keyboard or the display in a battery operated electronic device.
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