參數(shù)資料
型號： KA3037
廠商： Fairchild Semiconductor Corporation
英文描述： 7-CH Motor Driver(七通道電機驅(qū)動器)
中文描述： 7通道馬達驅(qū)動器（七通道電機驅(qū)動器）
文件頁數(shù)： 14/24頁
文件大小： 336K
代理商： KA3037
FAN8037 (KA3037)
14
6. FOCUS, TRACKING ACTUATOR, SPINDLE, SLED MOTOR DRIVE PART
Vref is given by the external bias voltage of the pin 44.
The input signal (Vin) through pins 46,1,4 and 7 is amplified one time and then fed to the output stage.
(assume that input opamp was used as a buffer)
The total closed loop voltage gain is as follows
To change the total closed loop voltage gain, use the input opamp as an amplifier
The output stage is the balanced transformerless (BTL) driver.
The bias voltage Vp is expressed as ;
44
Vref
46
1
4
48
3
6
47
2
5
8
+
+
7
9
+
OPin+
OPin-
Vp
Vp
R2
M
R1
R2
R2
R2
R1
R1
R2
DOP
DON
+
PVCC1
60k
62k
Dp
Qp
Vin
39
38
37
34 32
31
33
36
Vin
DOP
Vref
Vp
V
+
=
=
2 V
+
DON
Vp 2
–
V
=
Vout
DOP
DON
V
4 V
=
–
=
Gain
20
------------
log
20
4
log
12dB
=
=
=
Vp
PVCC1
VDp
–
VcesatQp
–
(
)
+
60k
62k
-------------------------
×
VcesatQp
+
=
-----------------------–
1.97
VcesatQp
+
=
VcesatQp
+
- - - - - - - - - - (1)
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