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參數資料
| 型號： | FAN8742GX |
| 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： | FAN8742GX |
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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