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參數資料
| 型號： | FAN8742G |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 光電元器件 |
| 英文描述： | Spindle Motor and 6-CH Driver |
| 中文描述： | CD MOTOR DRIVER, PDSO56 |
| 封裝： | SSOP-56 |
| 文件頁數： | 14/23頁 |
| 文件大小： | 541K |
| 代理商： | FAN8742G |
14
www.fairchildsemi.com
FAN8741/FAN8742 Rev. 1.0.1
F
2. Torque Control & Output Current Control Of Sled Motor(2-phase Step Motor)
1) By amplifying the voltage difference between V
REF
and SLIN1(or SLIN2) from Servo IC(or DSP), the Torque AMP produces
the input voltage(V
AMP
) which means input current command.
2) The output current (I
O
) is converted into the voltage (V
CS
) through the sense resistor (R
CS
) and compared with the V
AMP
.
3) The clock generator always make the RS latch become set periodically, this enables the output driver’s on state, when the V
CS
and the V
AMP
are equal the state becomes off.
4) By the negative feedback loop, the sensed output voltage V
CS
equals to the V
AMP
.
5) To avoid output upper and lower transistor’s short through, a switch trick is needed. Turn on delay time is 1usec, so the phase
delay time,when changing the current direction, is 1usec.
6) The gain and limit currents are calculated as shown in the table below.(Gvo=V
AMP
/[SLIN1(or SLIN2)-V
REF
]=1[V/V]
7)
The range of the torque voltage is as shown below when Rcs=1W, R
EXT1
=0
.
Torque limit current
Input/Output gain[A/V]
RE X T 1
Remark
is gain scaler
Torque AMP
SLIN1
(or SLIN2)
Driver
M
Rcs
Vcs
+
-
Io
VM2
V
AMP
+
-
LPF
R
S
Q
Clock
Generator
Drive Logic
Inside IC
I
OMAX
4
V
REF
R
EXT1
10K
10K
Rcs
----------
+
-------------------------------------------
-------------
RE X T 1
+
-------------------------------------------
Forward
Dead
zone-
Reverse
[A]
0
SLIN1(or SLIN2)-V
REF
0.5
15mV
-15mV
G
MSL
=G
VO
/ R
CS
Dead
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相關代理商/技術參數 |
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|---|---|
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| FAN8742MTF | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Spindle Motor and 6-CH Driver |
| FAN8742MTFX | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Spindle Motor and 6-CH Driver |
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| FAN8902 | 功能描述:馬達/運動/點火控制器和驅動器 Fan Motor Controller DC 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 |
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