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8958

Allegro MicroSystems
Part Number 8958
Manufacturer Allegro MicroSystems
Description VOICE COIL MOTOR DRIVER
Published Mar 22, 2005
Detailed Description 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...
Datasheet PDF File 8958 PDF File

8958
8958

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.
Under-voltage lockout disables the system in a controlled sequence if a fault condition occurs.
When activated by the under-voltage comparator, or a park command, the output power drivers change from a controlled current to a user-determined constant park voltage.
Other 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 applications.
The copper batwing construction provides for maximum package power dissipation in a minimum package size.
It is rated for continuous operation over the temperature range of 0°C to +70°C.
Data Sheet 26300.
5A + A - ABSOLUTE MAXIMUM RATINGS at TA = 25°C Supply Voltages, VBB and VCC 16 V ...


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