FAN8035 Fairchild Semiconductor, FAN8035 Datasheet - Page 13

• Manufacturer Part Number: FAN8035
• Description: 5 Channel BTL Driver + 1CH DC Motor Driver With 2 Op-amp
• Manufacturer: Fairchild Semiconductor

5. Focus, Tracking Actuator, Spindle, Sled Motor Drive Part
• The Vref at pin 43 is for eliminating the dc components from the input signals and can set by an exteranl circuit.
• The voltage gain from Vin to output is as follows ;
• Where ∆V means just ac component.
• The total input to output voltage gain is the sum of the input OP amp network gain and 18dB.
• The output stage is the balanced transformerless (BTL) driver.
• The bias voltage Vp is expressed as ;
48
1
2
V
Vout
DOP
Vin
DON
Gain
P
=
=
3
4
5
=
PVCC1 V
------------------------------------------------------------------------- -
(
=
=
PVCC1 V
=
=
Vref
6
7
8
V
V
DOP DON
20
D
D
–
+
log
10
11
9
4
+
4 V
–
∆
∆
–
∆
–
Vout
------------ -
V
V
∆
12
43
13
14
1.97
DP
V
DP
–
VREF
–
=
=
V
V
CESAT
20
8 V
IN+
IN-
CESAT
OUT
∆
log
8
Q
=
Q
P
PVCC1(PVCC2)
P
18dB
+
)
×
V
CESAT
------------------------- -
60k
Q
60K
62K
V
+
-
P
62k
DP
+
62k
Q
P
+
Vin
V
CESAT
Q
P
- - - - - - - - - -
Vp
Vp
10K
10K
40K
40K
10K
10K
(1)
40K
40K
DO+
DO-
M
27
28
29
30
31
32
35
34
FAN8035
37
36
13