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(yè)數(shù)： 28/43頁(yè)
文件大?。?/td> 786K
代理商： KA3120
KA3120
HDD PRODUCTS
28
PRELIMINARY
MIC-99D001
January 1999
VOICE COIL MOTOR
VCM driver
The voice coil motor driver is linear, class AB, H
bridge type driver, and it includes all power transistors. After the
VCM is enabled via CNTL3, the VCM current level is controlled by two PWM signals. The input voltage level at pin
PWMH weighs, at a maximum, 32 times more than the input voltage at pin PWML. These PWM signals are filtered
by an internal second
order low-pass filter and converted into PWMOUT (DC Voltage). The filter PWMOUT
depends only on the duty factor and not on the logic level. The PWM Filter's pole is adjustable by pin CFVCM
connected to the external capacitor.
Figure 9. PWM decoder & filter schematic 2
Figure 10. VCM driver schematic
+
+
15
14
13
+
+
PWMH input
PWML input
R1
1/2 VDD
Vin
R2
R1
1/2 VDD
Vin
R2
VREF(4V)
CFVCM
R1
R1
A
C1
C1
1/2 VDD
PWMOUT
Gm
Gm
+
+
+
+
+
Vin
(PWMDEC OUT)
Filtout
4V
vx
va
1/2VCC
R5
R3
VCM+
R6
VCM
R3
R5
R7
Errin
Errout
Rexif
Cexif
R25
Sense
Imotor
v+
L
RL
Rsense
v
motor
Senseout
vb
R4
vs
+
27
19
22
25
30
28
18
R18
R5
R5
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