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參數(shù)資料
| 型號： | FAN8732GX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 光電元器件 |
| 英文描述： | Spindle motor and 5-CH actuator driver [Spindle(PWM), Sled 2-CH(PWM) 3-CH(Linear)] |
| 中文描述： | CD MOTOR DRIVER, PDSO42 |
| 封裝： | SSOP-42 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 322K |
| 代理商： | FAN8732GX |
FAN8732G/FAN8732BG/FAN8732CG
12
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 is 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 has the RS latch set periodically, this makes output driver on state and when the V
CS
and the V
AMP
is
equal the state becomes off.
4) By the negative feedback loop, the sensed output voltage V
CS
equals to the V
AMP
.
5) Commutating sequence is selected by hall sensor inputs, and the minimum hall input voltage is 60mV.
6) The gain and limit current are calculated as below table.(Gvo=1[V/V])
7) The range of the input voltage is as shown below when Rcs=0.5
,
R
EXT1
=0 and R
EXT2
=inf.
Forward limit current
Reverse limit current
Input/Output gain[A/V]
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
R
EXT2
PVCC2
Inside IC
I
OMAX
6
----------
-----------
REXT2
---------------------+
-------------
REXT2
----------------------+
Forward
Dead
zone+
Dead
zone-
Reverse
Current
[A]
0
SPIN-V
REF
The input range of SPIN is 0 V ~ 5 V
1
40mV
-40mV
0.56
G
IO
=G
VO
/ R
CS
Rotation
SB=H
SPIN
> V
REF
Forward rotation
SPIN
< V
REF
Reverse brake
SB=L,
open
Short brake
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