Head-retract circuit for moving media storage apparatus
First Claim
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1. A moving media storage apparatus comprising:
- a spindle motor having a first pole;
a spindle driver for generating a spindle motor driving signal, said spindle driver including a first MOSFET having a first drain connected to a power supply, a first source connected to said first pole of said spindle motor, and a first body connected to ground, said first source and said first body not being shorted together;
a voice-coil motor; and
a head actuator for driving said voice-coil motor, said first pole of said spindle motor being connected via a diode to said head actuator.
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Abstract
A moving media storage apparatus including a head actuator driven by flyback emf generated by a spindle motor. The spindle motor is driven by VBAT, whereas the head actuator includes a head-control circuit and an H-bridge MOSFET construction which is driven by VBAT or VCC during normal operation, and a head-retract circuit which is driven by VAUX after a battery failure. A pair of bipolar transistors are provided in the head actuator for increasing the amount of time VAUX is available to drive a head-retract procedure.
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Citations
19 Claims
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1. A moving media storage apparatus comprising:
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a spindle motor having a first pole; a spindle driver for generating a spindle motor driving signal, said spindle driver including a first MOSFET having a first drain connected to a power supply, a first source connected to said first pole of said spindle motor, and a first body connected to ground, said first source and said first body not being shorted together; a voice-coil motor; and a head actuator for driving said voice-coil motor, said first pole of said spindle motor being connected via a diode to said head actuator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A moving media storage apparatus connected to a power supply, said apparatus comprising:
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a spindle motor; a voice-coil motor having a first pole and a second pole; a spindle driver connected to said spindle motor; and a head actuator comprising; a head control circuit, a first MOSFET having a first drain connected to said power supply, a first source connected to said first pole of said voice-coil motor, a first body connected to ground, and a first gate connected to said head control circuit, said first source not being shorted to said first body, a second MOSFET having a second drain connected to said power supply, a second source connected to said second pole of said voice-coil motor, a second body connected to ground, and a second gate connected to said head control circuit, said second source not being shorted to said second body, and an auxiliary voltage line, said first pole being connected to said auxiliary voltage line through a first diode, and said second pole being connected to said auxiliary voltage line through a second diode. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification