FAN8620B Datasheet, PDF (1/35 Pages) Fairchild Semiconductor – 12V Spindle Motor and Voice Coil Motor Driver

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FAN8620B
12V Spindle Motor and Voice Coil Motor Driver
Features
Spindle Motor Driver
• Soft commutation
• Spindle brake after retract
• Adjustable brake delay time
• 1.5A max. current power driver
• Low output saturation voltage: 1V typical @1.2A
• PWM decoder & filter for soft commutation
• The external circuit (ASIC) based start-up, commutation
and motor speed control
Voice Coil Motor Driver
• Trimmed low offset current
• 1.2A max. current power driver
• Gain selection and adjustable gain
• Automatic power failure 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
transistors
Power Monitoring
• Power on reset with delay
• Hysteresis on both power comparators
• Over temperature & over current shut down
• 5V and 12V power monitor threshold accuracy ±2%
Others
• Can be used with 5Volt and 3.3Volt control
signals(CNTL1,CNTL2 & CNTL3) for ASIC Interface
Package
• 48QFPH (48 pin quad flat package heat-sink)
Typical Application
• Hard disk drive (HDD)
Description
The FAN8620B is an ASIC combination chip, designed for
the HDD application, it includes the following functions:
spindle motor drive, voice coil motor drive, retract and
power management.
To drive and control the spindle, the external ASIC provides
the appropriate control signals (Start up, commutation, speed
control) to the FAN8620B. 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
Ordering Information
Device
Package
FAN8620B 48-QFPH-1414
Operating Temp.
0 ~ 70°C
©2000 Fairchild Semiconductor International
1
Rev. 1.0.0
May. 2000.