參數(shù)資料
型號(hào)： KA3120
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類(lèi)： 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(yè)數(shù)： 24/43頁(yè)
文件大?。?/td> 786K
代理商： KA3120
KA3120
HDD PRODUCTS
24
PRELIMINARY
MIC-99D001
January 1999
The digital ASIC continuously provides HIGH or OPEN signal until the BEMF generated is enough large to produce
the FG signal i.e. the spindle motor can be driven by the self commutation. During a fixed time, if the BEMF
generated is too small and the spindle motor is not driven by the self commutation, the ASIC resets all signals sent
and retries the spindle.
NOTES:
1.
2.
3.
4.
5.
CNTL1: Spindle motor control
CNTL2: Switching mode control
CNTL3; VCM motor control
Test only
“1”: Enable; “0”: disable; “S/W”: switching
ACCELERATION MODE
When the BEMF detected is enough to be used as the information of motor position, the mode is changed from
start-up to acceleration. The ASIC sends the optimum commutation timing signal via MCLK according to the FG
input.
By using the BEMF, the spindle is self-commuted at acceleration and running modes. During the motor drive, the
spindle motor is commuted at that point which is electrically 30
°
delayed after the FG_Edge generates.
RUNNING MODE
It is called to the running mode when the spindle motor speed arrives within
±
1% of the target speed. The
switching mode, commutation delay time, MCLK delay time (Td) and masking time are changed at the running
mode.
The spindle motor speed is controlled by PWM signal within
±
0.01%.
The soft switching using the current slope of the motor may reduce noise, EMI (Electromagnetic Interference) and
spark voltage which is generated on the motor coil at the switching.
Table 2. Pin setup truth table
CNTL1
(1)
CNTL2
(2)
CNTL3
(3)
GAINSEL
SPM driver
Brake
S/W
VCM driver
Retract
SPM driver
VCM gain
High (5V)
1
0
Hard S/W
1
0
Normal
0.125
Open (Floating)
0
0
Hard S/W
0
0
x
x
Low (0V)
0
1
Soft S/W
0
1
Start up
(4)
Hold
0.5
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