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參數資料
| 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/驅動器 |
| 文件頁數： | 15/21頁 |
| 文件大?。?/td> | 222K |
| 代理商： | FAN8623 |
FAN8621B
15
VCM Current Loop Error Amplifier
The inverting input of error amplifier is summing point of VCM current set point (FILOUT) and actual VCM current (SENSE-
OUT). The output of error amplifier is proportional to the dynamically compensated voltage difference between FILOUT and
SENSEOUT. This output voltage is level shifted to VCMREF4V via connecting non-inverting input of error amplifier inter-
nally to VCMREF4V. The dynamic compensation is achieved by external RC network connected to ERRIN (pin28) and
ERROUT (pin30 )
VCM Power Amplifier
The VCM power amplifier is a linear H-bridge type power driver consist of two NPN TR and two vertical PNP TR to reduce
voltage drop. Total voltage drop is 1.5V at 0.7A. The differential gain of power amplifier is 14.
If open loop gain of power and error amplifier is very large, the overall DC gain of VCM driver is calculated as follow
where R20 is VCM current sense resistor and Avs is gain of sense amplifier. Rmetal(VCM) is internal metal resistance(typi-
cally 0.05ohm). If R25
is equal to R19, R20 = 1
, and R
metal(VCM)
= 0
,
then overall DC gain is determined by the gain of sense
amplifier. For Example,GAINSEL is low,
And if GAINSEL is high, then
Figure 6. Current Control of VCM
Gm
R19
----------
R20
R
metal VCM
)
+
-------------------------------------------------
A
VS
----------
=
Gm
A
VS
----------
1
8
--
0.125
=
=
=
Gm
A
VS
----------
1
2
--
0.5
=
=
=
19
25
27
28
VCMREF4V
VCMREF4V
VCC
20
gain
2,8
gain
14
error
amp
sense
amp
power
amp
R28
C30
R19
R20
power
amp
VCM
R25
30
23
38
D20
D27
C9
C27
R27
9
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