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參數(shù)資料
| 型號(hào)： | FAN8621B |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 12V Spindle Motor and Voice Coil Motor Driver IC(12V電源的主軸電機(jī)和語(yǔ)音線圈電機(jī)驅(qū)動(dòng)器) |
| 中文描述： | VOICE COIL MOTOR CONTROLLER, PQFP52 |
| 封裝： | 14 X 14 MM, HEAT SINK, QFP-48 |
| 文件頁(yè)數(shù)： | 12/22頁(yè) |
| 文件大小： | 427K |
| 代理商： | FAN8621B |
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FAN8621B; PRELIMINARY
12
Spindle Motor Driver
The spindle motor driver has two operating modes : hard commutation in start-up and acceleration mode and soft commutation
in steady state to reduce acoustic noise.
Start-up and Acceleration
To spin up the motor, open mode start-up clock must be fed to CNTL2 pin in range 20 ~ 200Hz depending on number of plat-
ter and motor RPM. This HIGH and OPEN signal commutates motor current in turn while back-EMF comparator checks
back-EMF level. When the back-EMF detects motor position, then operating mode is changed from start-up mode to accelera-
tion mode. Also internal commutation logic starts sensorless commutation.
Speed Control
Spindle motor speed is defined by system clock and RPMSEL (pin48) . For your reference, see table2
Figure 2. Typical Control Sequence of the FAN8621B
Speed and rotor position of spindle motor is measured by back-EMFs. Back-EMF comparator detects zero crossing point
(ZCP) of unexcited phase back-EMF. The output frequency of comparator multiplied by 3 represents motor speed FG ( pin6).
FG frequency is calculated as follows
FG
= motor RPM/60
×
pole number/2
×
phase number
Table 2. RPM selection
For example, 8 pole, three phase 5400 rpm motor,
f
FG
= 5400 / 60
×
8 / 2
×
3 = 1080Hz
Pin Value
Speed
System clock
(CLK, pin8)
5MHz
Rpm selection
(RPMSEL, pin48)
L
H
L
H
5400 rpm
7200 rpm
3600rpm
4800rpm
3.333MHz
POR
CNTL1
CNTL2
CNTL3
SPEED
INTERNAL
READY
READY
soft
commutation
hard
commutatio
n
user
option
VCM
enable
0.27sec
TARGET
RPM
+0.7%
-0.7%
start-up
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