FAIRCHILD FAN8705

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 constant current and constant voltage drive blocks suitable for shutter, 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)
40MLP5X5
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.
Applications
n DSC, Mobile phone camera
Ordering Information
©2005 Fairchild Semiconductor Corporation
FAN8705 Rev. 1.0.1
1
Device
Package
Operating Temp.
FAN8705
40-MLP
−25°C ~ 80°C
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FAN8705 5 Channel DSC Motor Driver
March 2005
IN1
30
PGND2
29
OUT5
28
OUT6
27
OUT7
OUT8
26
25
SGND
24
VREF
ADJ1
ADJ2
23
22
21
IN2
31
20
ADJ3
IN3
32
19
PS
VM2
33
18
SEL
IN4
34
17
VDD
IN5
35
16
VM3
IN6
36
15
GAIN1
IN7
37
14
GAIN2
VM1
38
13
VM4
IN8
39
12
GAIN3
IN9
40
11
FC2
FAN8705MP
1
2
3
4
5
6
1N10
PGND1
OUT1
OUT2
OUT3
OUT4
2
FAN8705 Rev. 1.0.1
7
OUT9
8
OUT10
9
FC1
10
RS
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FAN8705 5 Channel DSC Motor Driver
Pin Assignments
Pin Number
Pin Name
I/O
Pin Function Description
1
IN10
I
Logic input 10
2
PGND1
P
Power ground 1 for Out 1~4
3
OUT1
A
Motor output 1
4
OUT2
A
Motor output 2
5
OUT3
A
Motor output 3
6
OUT4
A
Motor output 4
7
OUT9
A
Motor output 9
8
OUT10
A
Motor output 10
9
FC1
A
Compensation 1
10
RS
A
Motor current sensing for Out9~10
11
FC2
A
Compensation 2
12
GAIN3
I
Gain select for Out9~10
13
VM4
P
Power supply for Out9~10
14
GAIN2
I
Gain select for Out5~6
15
GAIN1
I
Gain select for Out1~4
16
VM3
P
Power supply for Out7~8
17
VDD
P
Logic power supply
18
SEL
I
CH1,2 logic input change
19
PS
I
Power save
20
ADJ3
A
Out9~10 current adjust
21
ADJ2
A
Out5~6 voltage adjust
22
ADJ1
A
Out1~4 voltage adjust
23
VREF
A
Reference output
24
SGND
P
Signal ground
25
OUT8
A
Motor output 8
26
OUT7
A
Motor output 7
27
OUT6
A
Motor output 6
28
OUT5
A
Motor output 5
29
PGND2
P
Power ground 2 for Out5~8
30
IN1
I
Logic input 1
31
IN2
I
Logic input 2
32
IN3
I
Logic input 3
33
VM2
P
Power supply for Out5~6
34
IN4
I
Logic input 4
35
IN5
I
Logic input 5
36
IN6
I
Logic input 6
Logic input 7
37
IN7
I
38
VM1
P
Power supply for Out1~4
39
IN8
I
Logic input 8
40
IN9
I
Logic input 9
3
FAN8705 Rev. 1.0.1
Remark
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FAN8705 5 Channel DSC Motor Driver
Pin Definitions
3
OUT1
4
OUT2
5
OUT3
VM1
6
OUT4
16 VM3
13 VM4
Constant
voltage
H-bridge
CH1
OUT6
26
OUT7
VM2
38 VM1
33 VM2
27
28
OUT5
Constant
voltage
H-bridge
CH2
25
OUT8
7
VM4
VM3
Constant
voltage
H-bridge
CH3
8
OUT10
OUT9
Constant
current
H-bridge
CH5
Saturated
H-bridge
CH4
RS
29 PGND2
2
PGND1
PGND1
4.9X
CH3
R
4.9X
21
Gain
control
2R
2R
22
7R
R
R
CH1,2
10
PGND2
Voltage
Reference
ADJ3
20
2R
R
R
ADJ1
FC1
Feed back
Compensation
ADJ2
9
FC2 11
CH1 CH2 CH3 CH4 CH5
23
VREF
VDD
Output stage
TSD
Output stage
UVLO
GAIN control
Logic
GAIN1 GAIN2 GAIN3
15
14
4
FAN8705 Rev. 1.0.1
Logic
Reference out
12
PS
19
SEL
IN1~IN10
17
SGND
24
18
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FAN8705 5 Channel DSC Motor Driver
Block Diagram
FAN8705 5 Channel DSC Motor Driver
Equivalent Circuits
Logic Input
30 31
ADJ1, ADJ2
23
1K
32 34
10K
35 36
100K
37 39
21 22
40 01
30K
18 12
14 15
FC1, FC2
ADJ3
VM
23
70K
20
09
11
30K
OUT7, OUT8
OUT1 ~ 6
VM
VM
25
26
27
03
04
05
06
27
28
50K
5
FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
Equivalent Circuits
OUT9, OUT10, RS
PS
100K
VM
19
100K
07
08
10
6
FAN8705 Rev. 1.0.1
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Parameter
Symbol
Maximum power supply voltage
Value
Unit
VDDMAX,VMMAX
5.5
V
Rja
100/52
oC/W
Maximum power dissipation
PDMAX
1.25/2.4
W
Maximum output voltage
VOMAX
6.5
V
Maximum output current
IOMAX
0.8
A
Operating temperature
TOPR
−25 ~ 85
°C
Storage temperature
TSTG
−55 ~ 150
°C
Thermal resistance
note
1. Should not exceed PD or ASO value.
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.
Case 1
Case 2
Remark
Power
plane(Cu)
Pd is measured base
on the JEDEC/
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
Case2
1.5
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
FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
Absolute Maximum Ratings (Ta = 25°C)
(Ta = 25°C, VDD =VM = 3V unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Total
Standby current
ISTB
PS = L
-
-
1
µA
VDD Operating current
IOPR
PS = H
-
1
3
mA
Low voltage protection off
VUVLOF
-
-
2.39
V
Low voltage protection on
VUVLO
1.8
-
-
V
Input stage
Logic input high voltage
VIH
0.7XVDD
-
-
V
Logic input low voltage
VIL
-
-
0.3XVDD
V
Logic input high current
IIH
Vinput = 3V
-
40
60
µA
Logic input low current
IIL
Vinput = 0V
-1
-
-
µA
Output Stage
Ron resistance(CH1~CH4)
RON1
IO=200mA (Upper+Lower)
-
1.1
1.5
Ω
Ron resistance(CH5)
RON2
IO=200mA (Upper+Lower)
-
0.9
1.3
Ω
1.85
1.95
2.05
V
279
300
321
mA
0.93
0.98
1.03
V
Constant voltage output
Vin=0.4V
Constant current accuracy
Reference
Reference voltage
VREF
IREF=2mA
8
FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
FAN8705 Electrical Characteristics
(Ta = 25°C, VDD =VM = 3V unless otherwise specified)
CH1,2,3 Constant voltage H-bridge switching time note1
Output turn on time
Output turn off time
TON
Input rising time = 20ns
Input 50% output 50%
1.5
3
µS
TOFF
Input rising time = 20ns
Input 50% output 50%
0.03
0.1
µS
Tr
Input rising time = 20ns
Output voltage 10% to 90%
1.5
3
µS
Tf
Input rising time = 20ns
Output voltage 90% to 10%
note1
0.03
0.1
µS
Output rising time
Output falling time
CH4 Saturated H-bridge switching time
Output turn on time
Output turn off time
Output rising time
Output falling time
TON4
Input rising time = 20ns
Input 50% output 50%
0.2
0.5
µS
TOFF4
Input rising time = 20ns
Input 50% output 50%
0.15
0.3
µS
Tr4
Input rising time = 20ns
Output voltage 10% to 90%
0.1
0.3
µS
Tf4
Input rising time = 20ns
Output voltage 90% to 10%
note1
0.03
0.1
µS
CH5 Constant current switching time
Output turn on time
Output turn off time
Output rising time
Output falling time
TON5
Input rising time = 20ns
Input 50% output 50%
0.5
1
µS
TOFF5
Input rising time = 20ns
Input 50% output 50%
0.07
0.2
µS
Tr5
Input rising time = 20ns
Output voltage 10% to 90%
0.1
0.3
µS
Tf5
Input rising time = 20ns
Output voltage 90% to 10%
0.03
0.1
µS
note
1. Guaranteed by design. not tested
Brake mode
Rotation mode
100%
100%
VIN
VIN
50%
50%
TON
90%
Hi- impedance
T ON
0%
90%
90%
90%
50%
50%
50%
IOUT
10%
10%
10%
Tr
Tf
Tf
9
FAN8705 Rev. 1.0.1
50%
T OFF
TOFF
100%
IOUT
50%
50%
-100%
10%
Tr
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FAN8705 5 Channel DSC Motor Driver
Switching characteristics
IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 SEL
CH1
L
L
L
L
L
L
L
L
L
L
L
L
OUT
2
OUT
3
OUT
4
OUT
5
OUT
6
OUT
7
OUT
8
OUT
9
OUT
10
Remark
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Standby
Z
Z
Z
L
H
L
H
Rotation
H
L
H
L
Rotation
H
H
Z
Z
Z
CH2
CH1
~
CH2
L
OUT
1
L
L
L
Z
Z
Z
L
H
L
H
Rotation
H
L
H
L
Rotation
H
H
Z
Z
Z
L
L
Z
Z
Z
L
H
Z
Z
Z
H
L
H
L
Rotation
H
H
L
H
2-2
phase
L
L
H
Rotation
Z
Z
Z
L
H
Z
Z
Z
H
L
H
L
Rotation
H
H
L
H
Rotation
CH3
CH4
CH5
L
L
Z
Z
Z
L
H
L
H
Rotation
H
L
H
L
Rotation
H
H
L
L
L
L
L
H
H
L
H
H
*
Brake
Z
Z
Z
L
H
Rotation
H
L
Rotation
L
L
Brake
L
L
Z
Z
Z
L
H
L
H
Rotation
H
L
H
L
Rotation
H
H
Z
Z
Z
Gain control
Gain control
GAIN1
GAIN2
GAIN3
Input H-bridge output control voltage
L
ADJ1
H
0.67XADJ1
L
ADJ2
H
0.33XADJ2
L
ADJ3
H
0.33XADJ3
CH1,CH2
CH 3
CH 5
10
FAN8705 Rev. 1.0.1
Remark
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FAN8705 5 Channel DSC Motor Driver
Operation Truth Table
Figure 1. VDD vs IOPR
Figure 2. VDD vs ISTB
3.00
1200.0
2.50
1000.0
2.00
ISTB (nA)
IDD (uA)
800.0
600.0
400.0
1.50
1.00
200.0
0.50
0.0
-200.0
0
1
2
3
4
5
0.00
6
0
1
2
3
4
5
6
-0.50
VDD (V)
VDD (V)
Figure 3. VDD vs IDD
Figure 4.IREF vs VREF (VDD = 3V)
1.20
1.040
1.00
1.020
1.000
VREF (V)
VREF (V)
0.80
0.60
0.40
0.980
0.960
0.940
0.20
0.920
0.00
0
1
2
3
4
5
0.900
6
0
-0.20
1
2
3
4
5
IREF (mA)
VDD (V)
Figure 3. RON vs IM (VDD = 3V)
Figure 4.RON vs VM (VDD = 3V)
1.6
1.40
1.4
RON1
1.20
RON1
1.2
1.00
1.0
RON (OHM)
RON (OHM)
RON2
0.8
0.6
0.60
0.4
0.40
0.2
0.20
0.0
RON2
0.80
0.00
0.0
0.2
0.4
0.6
0.8
1
IM (A)
3
4
5
VM (V)
11
FAN8705 Rev. 1.0.1
2
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FAN8705 5 Channel DSC Motor Driver
Typical Performance Characteristics
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,.
V MOTOR = V ADJ1 × 4.9 – V DSON ≈ V ADJ1 × 4.9 = 3.6V
when, Gain1 = high
2
2
V MOTOR = V ADJ1 × --- × 4.9 – V DSON ≈ V ADJ1 × --- × 4.9 = 2.4V
3
3
where, VMOTOR is motor driving voltage. VDSON is drain-source voltage of output lower MOSFET in on time, It’s less than
[email protected] VADJ1 is about 0.75V typically as following equation. It can be adjusted by installing external resister RADJ1.Calculated VMOTOR should be less than power supply voltege VM1 for operating constant voltage mode.
3
V ADJ1 = --- × V ref
4
VM1
IN1,2
IN3,4
Vref
OUT1,3
R
ADJ1
L
VADJ1
RADJ1
4.9X
R
Constant
Voltage
H-bridge
CH1,2
H
OUT2,4
2R
PGND1
GAIN1
12
FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
Application Information
1.1.1 Three Input 2-2 Phase Excitation
SEL
IN1/IN3
IN2
IN4
OUT1
OUT2
OUT3
OUT4
Function
L
X
X
Z
Z
Z
Z
Stand-by(Stop)
H
L
L
H
L
H
L
S1
H
H
L
L
H
H
L
S2
H
H
H
L
H
L
H
S3
H
L
H
H
L
L
H
S4
H
note
1. X : Don’t care.
2. Z : High impedence.
IN1 & IN3
IN2
Don’t care
IN4
CH1
Current
High Impedence
CH2
Current
S1
S2
S3
S4
VM1
OUT1
IN1
Constant
Voltage
H-bridge
CH1
IN2
DSP
or
Micom
IN3
Constant
Voltage
H-bridge
CH2
IN4
VDD
SEL
13
FAN8705 Rev. 1.0.1
STEP
M
OUT2
OUT3
OUT4
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FAN8705 5 Channel DSC Motor Driver
1.1 Stepping-Motor Drive
SEL
H
IN1
IN2
IN3
IN4
OUT1
OUT2
OUT3
OUT4
Function
L
L
L
L
Z
Z
Z
Z
Stand-by(Stop)
H
L
H
L
H
L
H
L
S1
L
X
H
L
Z
Z
H
L
S2
H
H
H
L
L
H
H
L
S3
H
H
L
X
L
H
Z
Z
S4
H
H
H
H
L
H
L
H
S5
L
X
H
H
Z
Z
L
H
S6
H
L
H
H
H
L
L
H
S7
H
L
L
X
H
L
Z
Z
S8
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
High Impedence
Don’t care
VM1
OUT1
IN1
Constant
Voltage
H-bridge
CH1
IN2
DSP
or
Micom
IN3
Constant
Voltage
H-bridge
CH2
IN4
VDD
SEL
14
FAN8705 Rev. 1.0.1
STEP
M
OUT2
OUT3
OUT4
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FAN8705 5 Channel DSC Motor Driver
1.1.2 Four Input 1-2 Phase Excitation Mode1
SEL
L
IN1
IN2
IN3
IN4
OUT1
OUT2
OUT3
OUT4
Function
L
L
L
L
Z
Z
Z
Z
Stand-by(Stop)
H
L
H
L
H
L
H
L
S1
H
H
H
L
Z
Z
H
L
S2
L
H
H
L
L
H
H
L
S3
L
H
H
H
L
H
Z
Z
S4
L
H
L
H
L
H
L
H
S5
L
L
L
H
Z
Z
L
H
S6
H
L
L
H
H
L
L
H
S7
H
L
L
L
H
L
Z
Z
S8
note
1. Z : High impedence.
IN1
IN2
IN3
IN4
CH1
Current
CH2
Current
S1 S2
S3
S4
S5
S6
S7
S8
High Impedence
VM1
IN1
Constant
Voltage
H-bridge
CH1
IN2
DSP
or
Micom
IN3
Constant
Voltage
H-bridge
CH2
IN4
OUT1
STEP
M
OUT2
OUT3
OUT4
SEL
15
FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
1.1.3 Four Input 1-2 Phase Excitation Mode2
SEL
IN1
IN2
L
IN3
IN4
GAIN1
OUT1
OUT2
OUT3
OUT4
Function
L
L
L
L
X
Z
Z
Z
Z
Stand-by(Stop)
H
L
H
L
H
H
L
H
L
S1
H
H
H
L
L
Z
Z
H
L
S2
L
H
H
L
H
L
H
H
L
S3
L
H
H
H
L
L
H
Z
Z
S4
L
H
L
H
H
L
H
L
H
S5
L
L
L
H
L
Z
Z
L
H
S6
H
L
L
H
H
H
L
L
H
S7
H
L
L
L
L
H
L
Z
Z
S8
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
High Impedence
Don’t care
VM1
OUT1
IN1
Constant
Voltage
H-bridge
CH1
IN2
DSP
or
Micom
IN3
Constant
Voltage
H-bridge
CH2
IN4
GAIN1
STEP
M
OUT2
OUT3
OUT4
SEL
16
FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
1.1.4 Pseudo Sine Wave Excitation
CH3 is constant voltage driver. The output voltage can be calculated by following equations.
When, Gain2 = low,.
V MOTOR = V ADJ2 × 4.9 – V DSON ≈ V ADJ2 × 4.9 = 3.6V
when, Gain2 = high
1
1
V MOTOR = V ADJ2 × --- × 4.9 – V DSON ≈ V ADJ2 × --- × 4.9 = 1.2V
3
3
where, VMOTOR is motor driving voltage. VDSON is drain-source voltage of output lower MOSFET in on time, It’s less than
[email protected] VADJ2 is about 0.75V typically as following equation. can be adjusted by installing external resister RADJ2.Calculated
VMOTOR should be less than power supply voltege VM2 for operating constant voltage mode.
3
V ADJ2 = --- × V ref
4
VM2
IN5,6
Vref
OUT5
R
ADJ2
Constant
Voltage
H-bridge
CH3
L
VADJ2
4.9X
2R
RADJ2
Iris
H
OUT6
R
PGND2
GAIN2
3. Channel 4
Channel 4 is operated by saturated H-bridge mode.
VM3
IN7
IN8
OUT7
Saturated
H-Bridge
CH4
DC
M
OUT8
PGND2
17
FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
2. Channel 3
Channel 5 is constant current driver. motor current is determined by ADJ3 voltage VADJ3, sensing resistance RSENSE and GAIN3
input and calculated by the following equation.
when, GAIN3 = Low
V ADJ3
I MOTOR = --------------------------------R Sense + R W
when, GAIN3 = High
V ADJ3 × 1 ⁄ 3
I MOTOR = --------------------------------R Sense + R W
where, RW is internal bonding resistance and metal resistance is around 0.05Ω
VM4
IN9,10
Vref
OUT9
Constant
current
H-bridge
CH5
7R
ADJ3
L
VADJ3
RADJ3
2R
Shutter
OUT10
H
R
RW
FC1 FC2
RS
RSense
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.
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FAN8705 5 Channel DSC Motor Driver
4. Channel 5
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 current sensing terminal RS connected to ground.
VM4
VREF
OUT9
Voltage
Reference
Constant
current
H-bridge
CH5
ADJ3
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
VREF
OUT1,3/
OUT5
Voltage
Reference
Constant
Voltage
H-bridge
CH1,2,3
ADJ1/
ADJ2
4.9X
IN1,2,3,4/
IN5,6
DC
M
OUT2,4/
OUT6
GAIN1/
GAIN2
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FAN8705 5 Channel DSC Motor Driver
6. Saturated H-Bridge Drive
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
Shutter motor
OPEN WEAK
OPEN
CLOSE
to1
to2
IDLE
OPEN
0 ~ OO
WEAK
CLOSE
20ms
20ms
Total Open
Shutter
Speed
Total Close
t0
t1
t2
t3
Effective
Exposure
time
To1
t4
t5
Image Data Storing Start
To2
IN9
IN10
GAIN3
Ishutter
T1
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FAN8705 Rev. 1.0.1
T2
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FAN8705 5 Channel DSC Motor Driver
5. Power Saving
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 5 Channel DSC Motor Driver
7. Short Circuit Protection
DC
M
STEP
M
Single
iris
Auto-focus
3
OUT1
4
OUT2
5
OUT3
VM1
6
OUT4
16 VM3
13 VM4
Constant
voltage
H-bridge
CH1
OUT6
26
OUT7
VM2
38 VM1
33 VM2
27
28
OUT5
Constant
voltage
H-bridge
CH2
Shutter
Zoom
25
OUT8
7
VM4
VM3
Constant
voltage
H-bridge
CH3
8
OUT10
OUT9
Constant
current
H-bridge
CH5
Saturated
H-bridge
CH4
RS
29 PGND2
2
PGND1
PGND1
4.9X
21
Gain
control
CH3
R
4.9X
2R
2R
22
7R
R
R
CH1,2
10
PGND2
Reference
1V
ADJ3
20
2R
R
R
ADJ1
FC1
Feed back
Compensation
ADJ2
9
FC2 11
CH1 CH2 CH3 CH4 CH5
23
VREF
VDD
Output stage
TSD
Output stage
UVLO
GAIN control
Logic
Reference out
Logic
GAIN1 GAIN2 GAIN3
15
14
12
PS
19
SEL
IN1~IN10
17
SGND
24
18
DSP
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FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
Typical Application Circuits 1
FAN8705 5 Channel DSC Motor Driver
Package Dimensions (Unit: mm)
Recommended Design
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FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
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FAN8705 Rev. 1.0.1
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