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參數資料
| 型號： | FAN8621B |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | 12V Spindle Motor and Voice Coil Motor Driver IC(12V電源的主軸電機和語音線圈電機驅動器) |
| 中文描述： | VOICE COIL MOTOR CONTROLLER, PQFP52 |
| 封裝： | 14 X 14 MM, HEAT SINK, QFP-48 |
| 文件頁數： | 15/22頁 |
| 文件大?。?/td> | 427K |
| 代理商： | FAN8621B |
FAN8621B; PRELIMINARY
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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| FAN8623 | 12V Spindle Motor and Voice Coil Motor Driver(12V電源的主軸電機和語音線圈電機驅動器) |
| FAN8700 | Camera Motor Drive and Control IC |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN8623 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Servo/Spindle Motor Controller/Driver |
| FAN8700 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Camera Motor Drive and Control IC |
| FAN8702 | 功能描述:馬達/運動/點火控制器和驅動器 6CH Motor Drive IC RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| FAN8702B | 功能描述:馬達/運動/點火控制器和驅動器 DSC 1CH IC RoHS:否 制造商:STMicroelectronics 產品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| FAN8702MP | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:6 Channel DSC Motor Driver |
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