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參數(shù)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(shù)： | 13/23頁 |
| 文件大小： | 541K |
| 代理商： | FAN8742GX |
13
www.fairchildsemi.com
FAN8741/FAN8742 Rev. 1.0.1
F
Application Information
1. Torque Control & Output Current Control of 3-phase Bldc Motor
1) By amplifying the voltage difference between V
REF
and SPIN 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) Commuting sequence is selected by hall sensor input, and the minimum hall input is 50mV.
6) The gain and limit currents are calculated as shown in the table below.(Gvo=V
AMP
/(SPIN-V
REF
)=1[V/V]).
7) Spindle block adopts 180
o
commutation methodology which is fully compatible with a conventional BLDC spindle motor. Users
don’t need to change or modify their spindle motor.
8) The range of the input voltage is as shown below when Rcs=0.33
, R
EXT1
=0.
Limit current
Input/Output gain[A/V]
RE X T 1
Remark
is gain scaler
Torque AMP
V
REF
SPIN
Commutator
Driver
M
Rcs
Vcs
+
-
Io
V
AMP
+
-
LPF
R
S
Q
Clock
Generator
Hall sensor
R
EXT1
VM1
Inside IC
IOMAX
6
10K
10K
Rcs
----------
+
-------------------------------------------
-------------
RE X T 1
+
-------------------------------------------
Forward
Dead
Reverse
[A]
0
SPIN-V
REF
1.5
50mV
-50mV
G
MSP
=G
VO
/ R
CS
Dead
Current
Rotation
MUTE2
=H
SPIN
> V
REF
Forward rotation
SPIN
< V
REF
Reverse brake
MUTE2
=L,open
-
Short brake
Short brake
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