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A8932CLWA Datasheet VOICE-COIL MOTOR DRIVER

Manufacturer: Allegro MicroSystems

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Overview

8932-A RET REF V FLT V BEMF GROUND UV SET R OUT P OUT SWITCH IN N OUT SW RETRACT FAULT MP RESET SIGNAL SUPPLY 1 2 3 4 5 6 7 8 28 27 RET SET V SENS V LOAD V SENS FB SGND N OUTP LOAD SUPPLY OUT N SGND P ACT FB PWR OFF H GAIN REFERENCE ACT VOICE-COIL MOTOR DRIVER Providing control and drive of the voice-coil motor used for head positioning in 5 V disk drive applications, the second-generation A8932CLWA is a full-bridge driver that can be configured so that its output current is a direct function of an externally applied control voltage or current.

This linear current control function is supplemented by additional circuitry to protect the heads and the data disk during system failure or normal system shutdown.

The two ±500 mA MOS driver outputs provide very low saturation voltage and minimal power dissipation.

Key Features

  • I I I I I I I I I I I Class-B, 2 Ω rDS(on) at 500 mA Output Lossless Current Sensing Zero Current-Loop Deadband High Transconductance Bandwidth User-Adjustable Transconductance Gain Digital Transconductance Gain Switch (4:1 Ratio) 5 Volt Monitor with Selectable UV Trip Point Retract Circuitry Functional to 0 Volts Sleep Mode Function Internal Back-EMF Velocity Loop Option Internal Thermal Shutdown Circuitry Dwg. PP-042B.

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