Pickup head circuits
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United States of America Patent
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Sep 14, 2010
Issued Date -
N/A
app pub date -
Jun 15, 2006
filing date -
Jul 19, 2005
priority date (Note) -
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Abstract
Pickup head circuits with a protection circuit capable of preventing unexpected large current flowing through a laser diode during power-on interval. A driving transistor is coupled between a laser diode and a first power voltage, an automatic laser power control (ALPC) circuit is coupled between the first power voltage and a second power voltage, controlling the driving transistor to drive the laser diode. A protection circuit is coupled between the power voltage and a control terminal of the driving transistor, forcing a voltage at the control terminal of the driving transistor to follow the first power voltage during a power-on interval.
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