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參數(shù)資料
| 型號： | FAN8623 |
| 英文描述： | Servo/Spindle Motor Controller/Driver |
| 中文描述： | 伺服/主軸電機控制器/驅(qū)動器 |
| 文件頁數(shù)： | 14/21頁 |
| 文件大小： | 222K |
| 代理商： | FAN8623 |
FAN8621B
14
Figure 4. Brake Function Block
Voice Coil Motor Driver
VCM Current Set Point
VCM current set point is defined by two PWM signals. External capacitor connected CFVCM (pin15) is charged and/or dis-
charged depending on status of PWM signals. The voltage, level shifted by 4V, is filtered by an internal 2-nd order filter and
converted into DC voltage, FILOUT (pin19) ranging from VCMREF4V+2V to VCMREF4V-2V. The cutoff frequency of the
2nd order filter is about 100KHz, so the PWM frequency must be grater than 100KHz. For more resolution of VCM current set
point, the value of two internal current sources for PWMH and PWML is not equal. The weight is 64, so it is good that fre-
quency of PWMH is different that of PWML. When PWM signal is LOW, CFVCM (pin15) voltage increases This voltage is
limited by internal 4V reference and resistor, R
FVCM.
Figure 5. Current Set Point with PWMs
Sense Amplifier
Current sense amplifier amplifies the differential voltage across the sense resistor which is in series with VCM coil. This
amplified voltage is level shifted by VCMREF4V. The amplifier gain is set to 2 or 8 depending on GAINSEL. The output of
the current sense amplifier is available at SENSEOUT( pin25).
18
37
34
33
40
41
brake
V
W
32
PVCC
VDD
2.8M
C41
C40
M40b
M40a
R33
VDD
VDD
VCMREF4V
i
pwml
i
pwmh
i
pwml
i
pwmh
Rfvcm
=4K
80pF
80pF
20K
20K
PWMH
PWML
C15
19
15
14
13
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