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參數(shù)資料
| 型號(hào)： | KA3120 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | SPINDLE & VOICE COIL MOTOR ONE CHIP DRIVER |
| 中文描述： | VOICE COIL MOTOR CONTROLLER, 2 A, PQFP48 |
| 封裝： | 14 X 14 MM, HEAT SINK, QFP-48 |
| 文件頁數(shù)： | 20/43頁 |
| 文件大小： | 786K |
| 代理商： | KA3120 |
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KA3120
HDD PRODUCTS
20
PRELIMINARY
MIC-99D001
January 1999
APPLICATION INFORMATION
SPINDLE MOTOR DRIVE PART
The KA3120 is a combination chip consisting of spindle motor and voice coil motor designed for HDD system.
According to the spindle conditions, the digital ASIC circuit provides optimum control signals (Start-up,
commutation, speed control, and switching mode) to the KA3120.
Detection of the back-EMF (BEMF) of the spindle motor has to be output to an external digital circuit via FG. The
MCLK and PWM signals are used to determine the commutation timing and to control the spindle speed,
respectively.
SPINDLE DRIVER
The spindle includes both low and high side drivers (H
bridge) for a three-phase sensorless brushless DC motor.
To reduce the saturation voltage, the vertical PNP Tr is used as the high side driver.
FREQUENCY GENERATION (FG)
FG stands for Frequency Generation. It is the out signal toward the digital ASIC.
Representing the current spindle speed frequency, it contains important information about the motor speed and
motor spin.
According to the FG frequency, the digital ASIC provides different motor clock signals to the motor drive IC via
MCLK and checks the motor speed to send the VCM enable signal via CNTL3.
FG frequency (Hz), motor speed (rpm) and pole number are directly related as shown below in the three phase
motor.
FG frequency = motor speed
×
pole number
×
3 / 120
In a typical application,(8 pole motor)
FG frequency = 5400
×
8
×
3 / 120 = 1080Hz
FG frequency = Output frequency
×
3
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