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參數(shù)資料
| 型號： | FAN8621B |
| 英文描述： | Industrial Control IC |
| 中文描述： | 工業(yè)控制IC |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 222K |
| 代理商： | FAN8621B |
FAN8621B
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)
Rpm selection
(RPMSEL, pin48)
L
H
L
H
5400 rpm
7200 rpm
3600rpm
4800rpm
5MHz
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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