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A8980CJT fiches techniques PDF

Allegro MicroSystems - SUPERSERVO SPINDLE & VOICE-COIL ACTUATION MANAGER/DRIVER

Numéro de référence A8980CJT
Description SUPERSERVO SPINDLE & VOICE-COIL ACTUATION MANAGER/DRIVER
Fabricant Allegro MicroSystems 
Logo Allegro MicroSystems 





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A8980CJT fiche technique
8980
SUPERSERVO
8980SPINDLE & VOICE-COIL
ACTUATION MANAGER/DRIVER
TM
SUPERSERVO SPINDLE & VOICE-COIL
ACTUATION MANAGER/DRIVER
BACK-EMF and
COMMUTATION LOGIC
8
SPIN-DEMAND
The A8980CJT provides complete drive, management, and control
of the voice-coil and spindle motor power actuation subsystems used
in hard disk drives. Extensive programmable control features and
system diagnostics are provided via a serial interface under the
direction of an external microcontroller. The large-scale integration
and use of advanced DABiC(digital/analog-BiCMOS) merged
technologies results in minimum power dissipation, minimum operating
voltage requirements, and minimum external components.
12
SERVO-DEMAND
The spindle drive function incorporates a three-phase MOS power
TSER DATA IN
SERVO CONTROL
ADJUST
VOLTAGE REF.
VREF(X2)
DUC YDwg.PP-048
Dwg. PP-048
TINUEEDRPERNOCE ONLABSOLUTE MAXIMUM RATINGS
N Fat TA = +25°C
O ELoad Supply Voltage, VCC(PWR) .......... 7.0 V
Spindle Output Current, IOUT(S) ......... ±1.6 A
C RVoice-Coil Output Current, IOUT(S) .... ±0.9 A
ISOutput Current, IOUT(S) ...................... ±1.6 A
RLogic Supply Voltage VCC(D) ............... 6.0 V
Operating Temperature Range,
D OTA ..................................... 0°C to +70°C
FOutput current rating may be restricted to a value
determined by system concerns and factors.
These include: system duty cycle and timing,
ambient temperature, and use of any heatsinking
driver and a back-EMF sensing motor commutation scheme. Internal
logic and analog circuitry provide complete start-up and µC-assisted
run modes without the need for snubbers or other external compo-
nents. Additional headroom is achieved by a proprietary circuit, which
eliminates the need for an external current-sense resistor. Intrinsic
ground clamp and flyback diodes are also provided.
The voice-coil function contains a 12-bit DAC, tunable low-pass
and notch filters, and a full-bridge power driver. The MOS outputs
provide increased available voltage and lower power dissipation over
bipolar devices. Voice-coil current is sensed by internal circuitry that
eliminates the need for an external current-sense resistor. Additional
internal circuitry can be configured to provide an over-velocity fault
limit by utilizing the internally monitored current of the voice-coil motor.
The spindle and voice-coil control functions are supplemented by
an ENERGY MANAGER™ subsystem, which efficiently channels available
power to protect the heads and the data disk during system failure or
normal system shutdown. Synchronous rectification of spindle
back-EMF voltage provides nearly lossless conversion of spindle
rotational inertia into power to operate the voice coil motor for parking
the heads. A dc-to-dc converter provides continuous operation at
minimum supply voltages. In addition, the ENERGY MANAGER subsystem
provides several sleep modes and latched fault states for undervoltage
or thermal faults.
The A8980CJT is supplied in a 64-lead thin quad flatpack for
surface-mount applications.
FEATURES
Voice Coil Motor Driver:
s Low rDS(on) MOS Outputs
s Lossless Current Sensing
s Zero Deadband
and/or forced cooling.
s User-Adjustable Transconductance Gain
s Retract Circuitry Functional to 0 V

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