A8936 Datasheet PDF - Allegro MicroSystems

Providing control and drive of the voice coil motor used for head positioning in 5 V disk drive applications, the A8936C— 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. An under- or over-velocity sense disables the system in a controlled sequence if a fault condition occurs.

FEATURES
■ Over-Velocity Fault Function
■ Lossless Current Sensing
■ Zero 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
■ Chip Enable/Sleep Mode Function
■ 1 V at 500 mA Output Saturation Voltage
■ Internal Thermal Shutdown Circuitry