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KA3120

SPINDLE & VOICE COIL MOTOR ONE CHIP DRIVER

Fairchild Semiconductor 

HDD PRODUCTS

PRELIMINARY

KA3120

SPINDLE & VOICE COIL MOTOR ONE CHIP DRIVER

The KA3120 is an ASIC combination chip, which was

designed for the HDD, includes the following functions:

spindle motor drive, voice coil motor drive, retract and

power management.

To drive and control the spindle, the digital ASIC provides

the appropriate control signals (Start up, commutation,

speed control) to the KA3120. The spindle motor condition

is monitored by the FG output and the motor speed control

is accomplished via the PWMSP input. The ASIC controls

the voice coil motor current via PWMH and PWML inputs

and the power management circuit always monitors the

power supply voltages.

48-QFPH-1414

FEATURES

ORDERING INFORMATION

SPINDLE MOTOR DRIVE PART

Device

Package

• Soft switching

KA3120 48-QFPH-1414

• Spindle brake after retract

• Adjustable brake delay time

• 2.0A max. current power driver

• Low output saturation voltage: 1V typical @1.6A

• PWM decoder & filter for soft switching

• The digital circuit (ASIC) based start-up, commutation and motor speed control

Operating Temperature

0 ~ 70°C

VOICE COIL MOTOR DRIVE PART

• Trimmed low offset current

• 1.2A max. current power driver

• Gain selection and adjustable gain

• Automatic power down retract function

• Class AB linear amplifier with no dead zone

• Low output saturation voltage: 0.8V typical @1.0A

• Internal full bridge with VPNP (Vertical PNP) & NPN

• VCM offset monitoring

© 1999 Fairchild Semiconductor Corporation

MIC-99D001

January 1999

Rev. B

1

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