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FAN8620B Datasheet

  • FAN8620B

  • 12V Spindle Motor and Voice Coil Motor Driver

  • 35頁(yè)

  • FAIRCHILD

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www.fairchildsemi.com
FAN8620B
12V Spindle Motor and Voice Coil Motor Driver
Features
Spindle Motor Driver
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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
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.
Voice Coil Motor Driver
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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
48-QFPH-1414
Power Monitoring
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Power on reset with delay
Hysteresis on both power comparators
Over temperature & over current shut down
5V and 12V power monitor threshold accuracy 鹵2%
Others
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Can be used with 5Volt and 3.3Volt control
signals(CNTL1,CNTL2 & CNTL3) for ASIC Interface
Package
鈥?48QFPH (48 pin quad flat package heat-sink)
Typical Application
鈥?Hard disk drive (HDD)
Ordering Information
Device
FAN8620B
Package
48-QFPH-1414
Operating Temp.
0 ~ 70擄C
Rev. 1.0.0
May. 2000.
漏2000 Fairchild Semiconductor International
1

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