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A8958CLB Datasheet VOICE COIL MOTOR DRIVER

Manufacturer: Allegro MicroSystems

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Overview

8958 LOGIC SUPPLY INHIBIT UV1 UV2 LIMIT GROUND AB GROUND AB PARK VOLTAGE SENSE IN– IN A+ IN A– OUT A 1 2 3 4 5 6 7 8 9 9 B 10 11 12 1.5 V + V CC VOICE COIL MOTOR DRIVER 24 23 22 21 20 19 18 17 SENSE OUT PARK DRIVE PARK GROUND PWR OK GROUNDAB GROUNDAB SENSE IN+ IN B+ IN B– LOAD SUPPLY OUT B Providing control and drive of the voice coil motor used for head positioning in disk drive applications, the A8958CLB is a full-bridge driver which 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 ±800 mA driver outputs provide very-low saturation voltage drops and precise current control utilizing a single current-sensing resistor connected in series with the load.

Key Features

  • include a power ok flag, a limit input to force the outputs to their maximum level in either polarity, an over-riding output disable to shut down both power amplifiers and reduce quiescent supply current, and internal thermal shutdown which disables the load (but still allowing the head to be parked) in the event of excessive junction temperatures. The load is re-enabled when the junction temperature returns to a safe level. The A8958CLB is supplied in a 24-lead power SOIC for surfacemount appli.

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