FAN8705 [FAIRCHILD]
5 Channel DSC Motor Driver; 5通道DSC电机驱动器
| 型号： | FAN8705 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | 5 Channel DSC Motor Driver |
| 文件： | 总24页 (文件大小：529K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 2005
FAN8705
5 Channel DSC Motor Driver
Features
Description
n Built in power save function
The FAN8705 is a DSC lens motor driver and it’s consist of con-
stant current and constant voltage drive blocks suitable for shut-
ter, single iris,auto-focus and zoom motor drive.
n Built in UVLO function.
n Constant current drive for shutter.
n Low Ron resistance (1.1 Ω @ 0.2A)
n Constant voltage drive for CH1~CH3.
n Pseudo sinewave control for AF.
n Three input 2-2 phase control for AF
n Built in short circuit protection.
n TSD protection.
40MLP5X5
Applications
n
DSC, Mobile phone camera
Ordering Information
Device
Package
Operating Temp.
FAN8705
40-MLP
−25°C ~ 80°C
©2005 Fairchild Semiconductor Corporation
FAN8705 Rev. 1.0.1
1
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Pin Assignments
IN1
30
PGND2
29
OUT5
28
OUT6
27
OUT7
26
OUT8
25
SGND
24
VREF
23
ADJ1
22
ADJ2
21
IN2
31
20 ADJ3
19 PS
IN3 32
33
34
18
VM2
IN4
SEL
17 VDD
16
15
14
IN5 35
VM3
FAN8705
36
37
IN6
IN7
GAIN1
GAIN2
VM1 38
13 VM4
39
40
12
11
IN8
IN9
GAIN3
FC2
1
2
3
4
5
6
7
8
9
10
1N10
PGND1
OUT1
OUT2
OUT3
OUT4
OUT9
OUT10
FC1
RS
2
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FAN8705 Rev. 1.0.1
Pin Definitions
Pin Number
Pin Name
IN10
I/O
I
Pin Function Description
Remark
1
Logic input 10
2
PGND1
OUT1
OUT2
OUT3
OUT4
OUT9
OUT10
FC1
P
A
A
A
A
A
A
A
A
A
I
Power ground 1 for Out 1~4
Motor output 1
3
4
Motor output 2
5
Motor output 3
6
Motor output 4
7
Motor output 9
8
Motor output 10
9
Compensation 1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
RS
Motor current sensing for Out9~10
Compensation 2
FC2
GAIN3
VM4
Gain select for Out9~10
Power supply for Out9~10
Gain select for Out5~6
Gain select for Out1~4
Power supply for Out7~8
Logic power supply
CH1,2 logic input change
Power save
P
I
GAIN2
GAIN1
VM3
I
P
P
I
VDD
SEL
PS
I
ADJ3
ADJ2
ADJ1
VREF
SGND
OUT8
OUT7
OUT6
OUT5
PGND2
IN1
A
A
A
A
P
A
A
A
A
P
I
Out9~10 current adjust
Out5~6 voltage adjust
Out1~4 voltage adjust
Reference output
Signal ground
Motor output 8
Motor output 7
Motor output 6
Motor output 5
Power ground 2 for Out5~8
Logic input 1
IN2
I
Logic input 2
IN3
I
Logic input 3
VM2
P
I
Power supply for Out5~6
Logic input 4
IN4
IN5
I
Logic input 5
IN6
I
Logic input 6
IN7
I
Logic input 7
VM1
P
I
Power supply for Out1~4
Logic input 8
IN8
IN9
I
Logic input 9
3
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FAN8705 Rev. 1.0.1
Block Diagram
3
4
5
6
27
26
25
7
28
8
OUT7
OUT1
OUT2
OUT10
OUT3
VM1
OUT4
OUT5
OUT6
OUT8
OUT9
VM4
VM2
VM3
38
33
VM1
VM2
Constant
voltage
H-bridge
CH1
Constant
voltage
H-bridge
CH2
Constant
voltage
H-bridge
CH3
Constant
current
H-bridge
CH5
Saturated
H-bridge
CH4
16 VM3
13 VM4
RS
10
PGND1
29 PGND2
PGND2
2
PGND1
7R
R
R
ADJ3
20
Gain
control
Voltage
Reference
CH1,2
CH3
4.9X
4.9X
2R
R
2R
R
R
2R
ADJ1
ADJ2
VREF
FC1
FC2
9
22
21
23
Feed back
Compensation
11
CH1 CH2 CH3 CH4 CH5
VDD
17
Output stage
Reference out
Logic
GAIN control
Logic
Output stage
TSD
UVLO
SGND
24
GAIN1 GAIN2
GAIN3
SEL
18
PS
19
IN1~IN10
15
14
12
4
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FAN8705 Rev. 1.0.1
Equivalent Circuits
Logic Input
ADJ1, ADJ2
30 31
32 34
23
1K
10K
35 36
37 39
100K
21 22
40
01
30K
18 12
14 15
FC1, FC2
ADJ3
VM
23
20
70K
09
11
30K
OUT7, OUT8
OUT1 ~ 6
VM
VM
03 04
05 06
27 28
25 26
50K
5
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FAN8705 Rev. 1.0.1
Equivalent Circuits
OUT9, OUT10, RS
PS
VM
100K
100K
19
07
08
10
6
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FAN8705 Rev. 1.0.1
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Symbol
Value
5.5
Unit
V
oC/W
Maximum power supply voltage
Thermal resistance
VDD VM
MAX, MAX
Rja
100/52
1.25/2.4
6.5
Maximum power dissipation
Maximum output voltage
Maximum output current
Operating temperature
Storage temperature
P
V
W
DMAX
OMAX
OMAX
V
I
0.8
A
T
OPR
−25 ~ 85
−55 ~ 150
°C
T
°C
STG
note
1. Should not exceed P or ASO value.
D
2. Refer: EIA/JESD 51-2 & EIA/JESD 51-3 & EIA/JESD 51-5 & EIA/JESD 51-7
3. Case 1: Single layer PCB with 1 signal plane only, PCB size 76mm × 114mm × 1.6mm.
4. Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes, PCB size 76mm × 114mm × 1.6mm, Cu plane
sizes for power and ground 74mm × 74mm × 0.035mm.
Remark
Case 1
Case 2
Pd is mea-
sured base
on the JE-
DEC/
Power
plane(Cu)
STD(JESD
51-2)
GND
plane(Cu)
PCB(glass-epoxy)
Pd=1.25W
Pd=1.8W
Recommended Operating Conditions (Ta = 25°C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Supply voltage
VDD
2.4
−
5.0
V
Power Dissipation Curve
2.0
1.5
Case2
Case1
1.0
SOA
0.5
0
0
25
50
75
100
125
150
175
Ambient temperature, Ta [°C]
PCB condition : When mounted on 76.2mm
×
114mm
×
1.57mm PCB (glass epoxy material).
7
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FAN8705 Rev. 1.0.1
FAN8705 Electrical Characteristics
(Ta = 25°C, VDD =VM = 3V unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Total
Standby current
I
PS = L
PS = H
-
-
-
1
-
1
3
µA
mA
V
STB
VDD Operating current
Low voltage protection off
Low voltage protection on
I
OPR
V
-
2.39
-
UVLOF
V
1.8
-
V
UVLO
Input stage
Logic input high voltage
Logic input low voltage
Logic input high current
Logic input low current
V
0.7XVDD
-
-
-
V
V
IH
V
-
-
0.3XVDD
IL
I
V
V
= 3V
= 0V
40
-
60
-
µA
µA
IH
input
input
I
IL
- 1
Output Stage
Ron resistance(CH1~CH4)
Ron resistance(CH5)
R
I =200mA (Upper+Lower)
-
1.1
0.9
1.5
1.3
Ω
Ω
ON1
ON2
O
R
I =200mA (Upper+Lower)
O
-
Constant voltage output
Constant current accuracy
Vin=0.4V
1.85
279
1.95
300
2.05
321
V
mA
Reference
Reference voltage
V
IREF=2mA
0.93
0.98
1.03
V
REF
8
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FAN8705 Rev. 1.0.1
Switching characteristics
(Ta = 25°C, VDD =VM = 3V unless otherwise specified)
CH1,2,3 Constant voltage H-bridge switching time note1
T
Input rising time = 20ns
Input 50% output 50%
ON
Output turn on time
Output turn off time
Output rising time
Output falling time
1.5
0.03
1.5
3
µS
µS
µS
µS
T
OFF
Input rising time = 20ns
Input 50% output 50%
0.1
3
T
Input rising time = 20ns
Output voltage 10% to 90%
r
T
Input rising time = 20ns
Output voltage 90% to 10%
f
0.03
0.1
CH4 Saturated H-bridge switching time note1
T
Input rising time = 20ns
Input 50% output 50%
ON4
Output turn on time
Output turn off time
Output rising time
Output falling time
0.2
0.15
0.1
0.5
0.3
0.3
0.1
µS
µS
µS
µS
T
OFF4
Input rising time = 20ns
Input 50% output 50%
T
Input rising time = 20ns
Output voltage 10% to 90%
r4
T
Input rising time = 20ns
Output voltage 90% to 10%
f4
0.03
CH5 Constant current switching time note1
T
Input rising time = 20ns
Input 50% output 50%
ON5
Output turn on time
Output turn off time
Output rising time
Output falling time
0.5
0.07
0.1
1
µS
µS
µS
µS
T
OFF5
Input rising time = 20ns
Input 50% output 50%
0.2
0.3
0.1
T
Input rising time = 20ns
Output voltage 10% to 90%
r5
T
Input rising time = 20ns
Output voltage 90% to 10%
f5
0.03
note
1. Guaranteed by design. not tested
Brake mode
Rotation mode
100%
100%
V
IN
VIN
50%
50%
0%
50%
50%
T
OFF
T
ON
T
ON
T
OFF
100%
90%
90%
90%
90%
I
OUT
50%
10%
50%
10%
50%
50%
10%
I
OUT
-100%
Hi- impedance 10%
T
f
T
r
T
f
T
r
9
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FAN8705 Rev. 1.0.1
Operation Truth Table
OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT
IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 SEL
Remark
1
Z
Z
L
2
Z
Z
H
L
3
4
5
6
7
8
9
10
Standby
L
L
L
L
L
L
L
L
L
L
L
L
L
Z
Z
Z
Z
Z
Z
Z
Z
Z
Rotation
Rotation
Z
L
H
L
CH1
CH2
H
H
H
Z
H
Z
L
L
L
L
H
L
Z
L
Z
H
L
Z
Rotation
Rotation
H
H
H
Z
H
Z
Z
Z
L
L
L
H
L
Z
Z
H
L
Z
Z
L
Z
CH1
~
CH2
Rotation
H
H
Rotation
H
H
H
L
L
L
H
L
Z
Z
H
L
Z
Z
L
Z
2-2
phase
Z
Rotation
H
H
Rotation
H
H
L
L
L
H
L
Z
L
Z
H
L
Z
Rotation
CH3
CH4
CH5
Rotation
H
H
H
L
H
L
Brake
Z
L
L
L
H
L
Z
L
Z
H
L
Rotation
*
Rotation
H
H
H
L
H
L
Brake
Z
L
L
L
H
L
Z
L
Z
H
L
Rotation
Rotation
Z
H
H
H
Z
H
Z
Gain control
H-bridge output control voltage
Remark
CH1,CH2
CH 3
Gain control Input
L
ADJ1
0.67XADJ1
ADJ2
GAIN1
H
L
GAIN2
H
0.33XADJ2
ADJ3
L
GAIN3
CH 5
H
0.33XADJ3
10
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FAN8705 Rev. 1.0.1
Typical Performance Characteristics
Figure 1. VDD vs I
Figure 2. VDD vs I
STB
OPR
3.00
2.50
2.00
1.50
1.00
0.50
0.00
-0.50
1200.0
1000.0
800.0
600.0
400.0
200.0
0.0
0
1
2
3
4
5
6
-200.0
0
1
2
3
4
5
6
VDD (V)
VDD (V)
Figure 3. VDD vs IDD
Figure 4.I
vs V
(VDD = 3V)
REF
REF
1.20
1.040
1.020
1.000
0.980
0.960
0.940
0.920
0.900
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
0
1
2
3
4
5
6
0
1
2
3
4
5
IREF (mA)
VDD (V)
Figure 3. R
vs I (VDD = 3V)
M
Figure 4.R
vs VM (VDD = 3V)
ON
ON
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
RON1
RON1
RON2
RON2
0.0
0.2
0.4
0.6
0.8
1
2
3
4
5
IM (A)
VM (V)
11
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FAN8705 Rev. 1.0.1
Application Information
1. Channel 1 and Channel 2
CH1 and CH2 are constant voltage driver. The output voltage can be calculated by following equations.
when, Gain1 = low,.
VMOTOR
=
VADJ1
×
4.9
–
VDSON
≈
VADJ1
×
4.9
= 3.6V
when, Gain1 = high
2
--
2
3
--
VMOTOR
=
VADJ1
×
×
4.9
–
VDSON
≈
VADJ1
×
×
4.9
=
2.4V
3
where, V
MOTOR
0.1V@300mA. V
is motor driving voltage. V
is drain-source voltage of output lower MOSFET in on time, It’s less than
DSON
is about 0.75V typically as following equation. It can be adjusted by installing external resister R
Calcu-
ADJ1.
ADJ1
lated V
should be less than power supply voltege VM1 for operating constant voltage mode.
MOTOR
3
4
--
× Vref
VADJ1
=
VM1
IN1,2
IN3,4
Vref
OUT1,3
OUT2,4
R
ADJ1
Constant
Voltage
H-bridge
CH1,2
L
V
ADJ1
ADJ1
4.9X
R
R
H
2R
PGND1
GAIN1
12
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FAN8705 Rev. 1.0.1
1.1 Stepping-Motor Drive
1.1.1 Three Input 2-2 Phase Excitation
SEL
IN1/IN3
IN2
X
IN4
X
OUT1
OUT2
OUT3
OUT4
Function
L
Z
H
L
Z
L
Z
H
H
L
Z
L
Stand-by(Stop)
H
H
H
H
L
L
S1
S2
S3
S4
H
H
L
H
H
L
L
H
H
L
H
H
L
H
H
L
note
1. X : Don’t care.
2. Z : High impedence.
IN1 & IN3
IN2
IN4
Don’t care
CH1
Current
High Impedence
CH2
Current
S1
S2
S3
S4
VM1
OUT1
IN1
IN2
IN3
IN4
Constant
Voltage
H-bridge
CH1
STEP
M
OUT2
OUT3
DSP
or
Micom
Constant
Voltage
H-bridge
CH2
VDD
SEL
OUT4
13
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FAN8705 Rev. 1.0.1
1.1.2 Four Input 1-2 Phase Excitation Mode1
SEL
IN1
L
IN2
L
IN3
L
IN4
L
OUT1
OUT2
OUT3
OUT4
Function
Z
H
Z
L
Z
L
Z
H
H
H
Z
L
Z
L
Stand-by(Stop)
H
L
H
L
S1
S2
S3
S4
S5
S6
S7
S8
L
X
H
L
Z
H
H
H
Z
L
L
H
H
H
H
X
H
L
L
H
H
L
X
L
Z
H
H
H
Z
H
H
H
H
H
X
L
L
H
Z
H
H
L
H
L
H
L
H
L
L
L
Z
note
1. X : Don’t care.
2. Z : High impedence.
IN1
IN2
IN3
IN4
CH1
Current
CH2
Current
S1 S2 S3 S4 S5 S6 S7 S8
Don’t care
High Impedence
VM1
OUT1
IN1
IN2
IN3
IN4
Constant
Voltage
H-bridge
CH1
STEP
M
OUT2
OUT3
DSP
or
Micom
Constant
Voltage
H-bridge
CH2
VDD
SEL
OUT4
14
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FAN8705 Rev. 1.0.1
1.1.3 Four Input 1-2 Phase Excitation Mode2
SEL
IN1
L
IN2
L
IN3
L
IN4
L
OUT1
OUT2
OUT3
OUT4
Function
Z
H
Z
L
Z
L
Z
H
H
H
Z
L
Z
L
Stand-by(Stop)
H
H
L
L
H
H
H
H
L
L
S1
S2
S3
S4
S5
S6
S7
S8
H
H
H
H
L
L
Z
H
H
H
Z
L
L
L
L
L
L
H
H
H
H
L
L
Z
H
H
H
Z
L
L
L
L
Z
H
H
L
H
H
L
L
L
L
L
L
Z
note
1. Z : High impedence.
IN1
IN2
IN3
IN4
CH1
Current
CH2
Current
S1 S2 S3 S4 S5 S6 S7 S8
High Impedence
VM1
OUT1
IN1
IN2
IN3
Constant
Voltage
H-bridge
CH1
STEP
M
OUT2
OUT3
DSP
or
Micom
Constant
Voltage
H-bridge
CH2
IN4
OUT4
SEL
15
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FAN8705 Rev. 1.0.1
1.1.4 Pseudo Sine Wave Excitation
SEL
IN1
L
IN2
L
IN3
L
IN4
L
GAIN1 OUT1 OUT2 OUT3 OUT4
Function
X
H
L
Z
H
Z
L
Z
L
Z
H
H
H
Z
L
Z
L
Stand-by(Stop)
H
H
L
L
H
H
H
H
L
L
S1
S2
S3
S4
S5
S6
S7
S8
H
H
H
H
L
L
Z
H
H
H
Z
L
L
L
H
L
L
L
L
H
H
H
H
L
L
Z
H
H
H
Z
L
H
L
L
L
L
Z
H
H
L
H
H
L
L
H
L
L
L
L
L
Z
note
1. X : Don’t care.
2. Z : High impedence.
IN1
IN2
IN3
IN4
GAIN1
CH1
Current
CH2
Current
S1 S2 S3 S4 S5 S6 S7 S8
Don’t care
High Impedence
VM1
OUT1
IN1
IN2
IN3
IN4
Constant
Voltage
H-bridge
CH1
STEP
M
OUT2
OUT3
DSP
or
Micom
Constant
Voltage
H-bridge
CH2
GAIN1
SEL
OUT4
16
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FAN8705 Rev. 1.0.1
2. Channel 3
CH3 is constant voltage driver. The output voltage can be calculated by following equations.
When, Gain2 = low,.
VMOTOR
=
VADJ2
×
4.9
–
VDSON
≈
VADJ2
×
4.9
= 3.6V
when, Gain2 = high
1
3
1
3
--
--
VMOTOR
=
VADJ2
×
×
4.9
–
VDSON
≈
VADJ2
×
×
4.9
=
1.2V
where, V
MOTOR
0.1V@300mA. V
is motor driving voltage.
V
is drain-source voltage of output lower MOSFET in on time, It’s less than
DSON
is about 0.75V typically as following equation. can be adjusted by installing external resister R
Calculated
ADJ2.
ADJ2
V
should be less than power supply voltege VM2 for operating constant voltage mode.
MOTOR
3
4
--
× Vref
VADJ2
=
VM2
IN5,6
Vref
OUT5
OUT6
R
ADJ2
Constant
Voltage
H-bridge
CH3
L
V
ADJ2
Iris
4.9X
2R
R
R
ADJ2
H
PGND2
GAIN2
3. Channel 4
Channel 4 is operated by saturated H-bridge mode.
VM3
IN7
IN8
OUT7
OUT8
Saturated
H-Bridge
CH4
DC
M
PGND2
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FAN8705 Rev. 1.0.1
4. Channel 5
Channel 5 is constant current driver. motor current is determined by ADJ3 voltage V
input and calculated by the following equation.
, sensing resistance R
and GAIN3
SENSE
ADJ3
when, GAIN3 = Low
VADJ3
IMOTOR = ---------------------------------
RSense
+ RW
when, GAIN3 = High
VADJ3
IMOTOR = ---------------------------------
RSense RW
× 1 ⁄ 3
+
where, R is internal bonding resistance and metal resistance is around 0.05Ω
W
VM4
IN9,10
Vref
OUT9
Constant
7R
ADJ3
current
H-bridge
CH5
Shutter
L
V
ADJ3
2R
R
OUT10
R
ADJ3
H
R
W
RS
FC1 FC2
R
Sense
GAIN3
If oscillation or overshoot will be appeared in the output terminals, add external capacitors at FC1 and FC2 terminals. The output
response time depend on the FC1/FC2 capacitance and interval of input signal.
18
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FAN8705 Rev. 1.0.1
6. Saturated H-Bridge Drive
Saturated H-bridge drive mode can be implemented using the constant current drive block or the constant voltage drive blocks.
6.1 Saturated H-Bridge Drive Using Constant Current Drive Block
Saturated H-bridge drive mode using the constant current dirve block can be operated with ADJ3 connected to VREF input and cur-
rent sensing terminal RS connected to ground.
VM4
VREF
ADJ3
Voltage
Reference
OUT9
Constant
current
H-bridge
CH5
DC
M
OUT10
IN9,10
RS
6.2 Saturated H-Bridge Drive Using Constant Voltage Drive Block
GAIN1/GAIN2 pin is open or connected to ground and ADJ1/ADJ2 input should be connected to VREF when VM1/ VM2 is less than
5V. If VM1/VM2 is more than 5V, ADJ1/ADJ2 input should be connected to power supply input.
VM1/VM2
OUT1,3/
OUT5
VREF
Voltage
Reference
Constant
Voltage
DC
M
ADJ1/
ADJ2
H-bridge
CH1,2,3
4.9X
IN1,2,3,4/
IN5,6
OUT2,4/
OUT6
GAIN1/
GAIN2
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FAN8705 Rev. 1.0.1
5. Power Saving
The typical timing chart to get 1 frame of still image or motion pictures for shutter operation is shown following fig. If shutter is fully
opened within some time interval(to1) depending on shutter motor and mechanism, then we don’t need to operate shutter motor to be
opened more in ’WEAK OPEN’(to2). In other words we simply maintain the shutter open. The method to maintain this is to reduce
shutter current by control GAIN3 input. So, battery power can be saved. and ’WEAK CLOSE’ is the same.
To : High speed shutter motor : 1/5000s
Bulb shutter : > 1sec
tc1
tc2
OPEN
IDLE
OPEN
IDLE
OPEN
0 ~ OO
WEAK
OPEN
to2
OPEN
Shutter motor
CLOSE
WEAK
CLOSE
to1
20ms
20ms
Total Open
Total Close
Shutter
Speed
t0
t1
t2
t3
t4
t5
Effective
Exposure
time
Image Data Storing Start
To1
To2
IN9
IN10
GAIN3
Ishutter
T1
T2
20
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FAN8705 Rev. 1.0.1
7. Short Circuit Protection
A short circuit can occur for many reasons , a short on the load, a mistake during the connection of the wires between the device and
the load, an accidental short between the wires and so on. The outputs are not protected against the short circuit and if a short
occurs, the big amount of current flowing through the outputs can destroy the device. To avoid this risk can be useful to add a circuitry
to protect the device. FAN8705 have two types of short circuit protection, output to output short and output to ground short.
8. Thermal Shutdown
Thermal Shutdown Circuit turns OFF all outputs when the junction temperature typically reaches 175°C. It is intended to protect the
device from failures due to excessive junction temperature.
The Thermal Shutdown has the hysteresis of 25°C approximately.
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FAN8705 Rev. 1.0.1
Typical Application Circuits 1
DC
M
STEP
M
Single
iris
Shutter
OUT10
Auto-focus
Zoom
3
4
5
6
27
26
25
7
28
8
OUT7
OUT1
OUT2
OUT3
VM1
OUT4
OUT5
OUT6
OUT8
OUT9
VM4
VM2
VM3
38
33
VM1
VM2
Constant
voltage
H-bridge
CH1
Constant
voltage
H-bridge
CH2
Constant
voltage
H-bridge
CH3
Constant
current
H-bridge
CH5
Saturated
H-bridge
CH4
16 VM3
13 VM4
RS
10
PGND1
29 PGND2
PGND2
2
PGND1
7R
R
R
ADJ3
20
Gain
control
Reference
1V
CH1,2
CH3
4.9X
4.9X
2R
R
2R
R
R
2R
ADJ1
ADJ2
VREF
FC1
FC2
9
22
21
23
Feed back
Compensation
11
CH1 CH2 CH3 CH4 CH5
VDD
17
24
Output stage
Reference out
Logic
GAIN control
Logic
Output stage
TSD
UVLO
SGND
GAIN1 GAIN2
GAIN3
PS
19
SEL
18
IN1~IN10
15
14
12
DSP
22
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FAN8705 Rev. 1.0.1
Package Dimensions (Unit: mm)
Recommended Design
23
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FAN8705 Rev. 1.0.1
24
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FAN8705 Rev. 1.0.1
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