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參數資料
| 型號： | FAN8623 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | 12V Spindle Motor and Voice Coil Motor Driver(12V電源的主軸電機和語音線圈電機驅動器) |
| 中文描述： | VOICE COIL MOTOR CONTROLLER, 1.2 A, PQFP52 |
| 封裝： | 14 X 14 MM, HEAT SINK, QFP-48 |
| 文件頁數： | 16/35頁 |
| 文件大小： | 443K |
| 代理商： | FAN8623 |
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FAN8623; PRELIMINARY
16
Application Information
Spindle Motor Drive Circuit
The FAN8623 is a combination chip consisting of spindle motor and voice coil motor designed for HDD system. According to
the spindle conditions, the digital ASIC provides optimum control signals (Start-up, commutation, speed control, and commu-
tation mode) to the FAN8623.
Back-EMF (BEMF) signal of the spindle motor is fed back to ASIC via FG line. 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 transistor is used as the high side driver.
Frequency Generation (FG)
FG stands for Frequency Generation. It is the output signal to the ASIC.
It contains important information about the motor speed.
According to the FG frequency, the digital ASIC provides different motor clock signals to the motor drive IC via MCLK.
It 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(Hz) = motor speed(rpm)
×
pole number / 2
×
3 / 60
In a typical application,(8 pole motor)
FG frequency = 5400
×
8 /2
×
3 / 60 = 1080 Hz
MCLK & Mask
The MCLK is a motor clock used as the standard clock signal for the proper commutation timing of the spindle motor. It is
supplied by the ASIC.
As shown in table 1, it has different delay times depending on the mode of the spindle.
Table 1.
After the FG_Edge signal detection, the MCLK occurs after a half FG_Edge delay time in the acceleration mode and 1/ 32
FG_Edge delay time in the soft commutation mode.
MCLK (Td)
2ms (External ASIC)
FG(n-1) / 2
FG(n-1) / 32
MASK
1ms
FG(n-1) / 4
344.45
m
s
Commutation
Hard
Hard
Soft
Start-up mode
Acceleration mode
Running mode
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| FAN8702 | 6 Channel DSC Motor Driver |
| FAN8702B | DUO-MODULAR TERM.WK 4/D2/2U/V0 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN8700 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Camera Motor Drive and Control IC |
| FAN8702 | 功能描述:馬達/運動/點火控制器和驅動器 6CH Motor Drive IC RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| FAN8702B | 功能描述:馬達/運動/點火控制器和驅動器 DSC 1CH IC RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| FAN8702MP | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:6 Channel DSC Motor Driver |
| FAN8702MPX | 功能描述:馬達/運動/點火控制器和驅動器 6CH Motor Drive IC RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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