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FAN8705 5 Channel DSC Motor Driver
March 2005
FAN8705 5 Channel DSC Motor Driver
Features
n Built in power save function n Built in UVLO function. n Constant current drive for shutter. n Low Ron resistance (1.1 @ 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.
Description
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. 40MLP5X5
Applications
n DSC, Mobile phone camera
Ordering Information
Device
FAN8705
Package
40-MLP
Operating Temp.
-25C ~ 80C
(c)2005 Fairchild Semiconductor Corporation
1
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FAN8705 Rev. 1.0.1
FAN8705 5 Channel DSC Motor Driver
Pin Assignments
IN1 30 IN2
PGND2 29
OUT5 28
OUT6 27
OUT7 26
OUT8 25
SGND 24
VREF 23
ADJ1 22
ADJ2 21
31
20
ADJ3
IN3
32
19
PS
VM2
33
18
SEL
IN4
34
17
VDD
IN5
35
16
VM3
FAN8705MP
IN6 36 15 GAIN1 IN7 37 14 GAIN2
VM1
38
13
VM4
IN8
39
12
GAIN3
IN9
40
11
FC2
1 1N10
2 PGND1
3 OUT1
4 OUT2
5 OUT3
6 OUT4
7 OUT9
8 OUT10
9 FC1
10 RS
2 FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
Pin Definitions
Pin Number
1 2 3 4 5 6 7 8 9 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
Pin Name
IN10 PGND1 OUT1 OUT2 OUT3 OUT4 OUT9 OUT10 FC1 RS FC2 GAIN3 VM4 GAIN2 GAIN1 VM3 VDD SEL PS ADJ3 ADJ2 ADJ1 VREF SGND OUT8 OUT7 OUT6 OUT5 PGND2 IN1 IN2 IN3 VM2 IN4 IN5 IN6 IN7 VM1 IN8 IN9
I/O
I P A A A A A A A A A I P I I P P I I A A A A P A A A A P I I I P I I I I P I I
Pin Function Description
Logic input 10 Power ground 1 for Out 1~4 Motor output 1 Motor output 2 Motor output 3 Motor output 4 Motor output 9 Motor output 10 Compensation 1 Motor current sensing for Out9~10 Compensation 2 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 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 Logic input 2 Logic input 3 Power supply for Out5~6 Logic input 4 Logic input 5 Logic input 6 Logic input 7 Power supply for Out1~4 Logic input 8 Logic input 9
Remark
3 FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
Block Diagram
3 OUT1 38 VM1 33 VM2 16 VM3 13 VM4 OUT2
4 OUT3 VM1
5 OUT4
6 OUT5
28 OUT6 VM2
27 OUT7
26 OUT8 VM3
25 OUT9
7 OUT10 VM4
8
Constant voltage H-bridge CH1
PGND1
Constant voltage H-bridge CH2
Constant voltage H-bridge CH3
PGND2
R
Saturated
H-bridge CH4
Constant current H-bridge CH5
RS 10
29 PGND2 2 PGND1
CH1,2
R
7R
ADJ3 20
4.9X
CH3 R
4.9X
2R
Gain control
Voltage Reference
2R
2R
R
R
22
ADJ1
FC1
21
ADJ2
Feed back Compensation
9
FC2 11
CH1 CH2 CH3 CH4 CH5
23 VREF Output stage Output stage VDD
GAIN control
PS 19
TSD
UVLO
Reference out Logic GAIN1 GAIN2 GAIN3 15 14 12
Logic
SEL 18 IN1~IN10
17 SGND 24
4 FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
Equivalent Circuits
Logic Input ADJ1, ADJ2
30 31 32 34 35 36 37 39 40 01 18 12 14 15
1K
23 10K
100K
21 22 30K
FC1, FC2
ADJ3
VM
23 70K 20 09 11 30K
OUT7, OUT8
OUT1 ~ 6
VM
VM 03 25 26 27 50K 05 27 04 06 28
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FAN8705 5 Channel DSC Motor Driver
Equivalent Circuits
OUT9, OUT10, RS PS
VM
100K 19 100K
07 08
10
6 FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
Absolute Maximum Ratings (Ta = 25C)
Parameter
Maximum power supply voltage Thermal resistance Maximum power dissipation Maximum output voltage Maximum output current Operating temperature Storage temperature
Symbol
VDDMAX,VMMAX Rja PDMAX VOMAX IOMAX TOPR TSTG
Value
5.5 100/52 1.25/2.4 6.5 0.8 -25 ~ 85 -55 ~ 150
Unit
V
oC/W
W V A C C
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 x 114mm x 1.6mm. 4. Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes, PCB size 76mm x 114mm x 1.6mm, Cu plane sizes for power and ground 74mm x 74mm x 0.035mm.
Case 1
Case 2
Remark Pd is measured base on the JEDEC/ STD(JESD 51-2)
Power plane(Cu)
GND plane(Cu)
PCB(glass-epoxy)
Pd=1.25W
Pd=1.8W
Recommended Operating Conditions (Ta = 25C)
Parameter
Supply voltage
Symbol
VDD
Min.
2.4
Typ.
-
Max.
5.0
Unit
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 x 114mm x 1.57mm PCB (glass epoxy material).
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FAN8705 5 Channel DSC Motor Driver
FAN8705 Electrical Characteristics
(Ta = 25C, VDD =VM = 3V unless otherwise specified) Parameter Total
Standby current VDD Operating current Low voltage protection off Low voltage protection on ISTB IOPR VUVLOF VUVLO PS = L PS = H 1.8 1 1 3 2.39 A mA V V
Symbol
Conditions
Min.
Typ.
Max.
Unit
Input stage
Logic input high voltage Logic input low voltage Logic input high current Logic input low current VIH VIL IIH IIL Vinput = 3V Vinput = 0V 0.7XVDD -1 40 0.3XVDD 60 V V A A V mA
Output Stage
Ron resistance(CH1~CH4) Ron resistance(CH5) Constant voltage output Constant current accuracy RON1 RON2 IO=200mA (Upper+Lower) IO=200mA (Upper+Lower) Vin=0.4V 1.85 279 1.1 0.9 1.95 300 1.5 1.3 2.05 321
Reference
Reference voltage VREF IREF=2mA 0.93 0.98 1.03 V
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FAN8705 5 Channel DSC Motor Driver
Switching characteristics
(Ta = 25C, VDD =VM = 3V unless otherwise specified) CH1,2,3 Constant voltage H-bridge switching time note1
Output turn on time Output turn off time Output rising time Output falling time TON TOFF Tr Tf Input rising time = 20ns Input 50% output 50% Input rising time = 20ns Input 50% output 50% Input rising time = 20ns Output voltage 10% to 90% Input rising time = 20ns Output voltage 90% to 10% note1 Input rising time = 20ns Input 50% output 50% Input rising time = 20ns Input 50% output 50% Input rising time = 20ns Output voltage 10% to 90% Input rising time = 20ns Output voltage 90% to 10% note1 Input rising time = 20ns Input 50% output 50% Input rising time = 20ns Input 50% output 50% Input rising time = 20ns Output voltage 10% to 90% Input rising time = 20ns Output voltage 90% to 10% 1.5 0.03 1.5 0.03 3 0.1 3 0.1 S S S S
CH4 Saturated H-bridge switching time
Output turn on time Output turn off time Output rising time Output falling time TON4 TOFF4 Tr4 Tf4
0.2 0.15 0.1 0.03
0.5 0.3 0.3 0.1
S S S S
CH5 Constant current switching time
Output turn on time Output turn off time Output rising time Output falling time TON5 TOFF5 Tr5 Tf5
0.5 0.07 0.1 0.03
1 0.2 0.3 0.1
S S S S
note 1. Guaranteed by design. not tested
Rotation mode
100% VIN 50% TON 100% 90% IOUT Hi- impedance 50% 10% Tr Tf 90% 50% 10%
Brake mode
100% VIN
50%
50% TOFF 0% 90%
50% TON 90% 50% 10% Tf -100% 50% 10% Tr
TOFF
IOUT
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FAN8705 5 Channel DSC Motor Driver
Operation Truth Table
IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 SEL OUT 1 OUT 2 OUT 3 OUT 4 OUT 5 OUT 6 OUT 7 OUT 8 OUT 9 OUT 10 Remark
Standby
L L
L L H L H
L
L
L
L
L
L
L
L
L
Z Z L H Z
Z Z H L Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Rotation Rotation
CH1
L H H
Z Z L H Z Z H L Z Z
Rotation Rotation
L
L H L H
L
CH2
L H H L L H L H L
Z Z Z
Rotation Rotation
Z Z H L L H L H L L H L H L L H L H L L H L H * H
Z Z L H Z Z H L Z Z L H Z L H L Z H L L Z L H L Z H L L Z L H Z Z H L Z
CH1 ~ CH2
2-2 phase
L H H
Z Z
Rotation Rotation
L H H
Z
Rotation Rotation
CH3
L H H
Brake Z
Rotation Rotation
CH4
L H H
Brake Z
Rotation Rotation
CH5
L H H
Z
Gain control Gain control
GAIN1
Input H-bridge output control voltage
L H L H L H ADJ1 0.67XADJ1 ADJ2 0.33XADJ2 ADJ3 0.33XADJ3
Remark
CH1,CH2
GAIN2
CH 3
GAIN3
CH 5
10 FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
Typical Performance Characteristics
Figure 1. VDD vs IOPR
1200.0 1000.0 800.0 IDD (uA) 600.0 400.0 200.0
0.50 ISTB (nA) 3.00 2.50 2.00 1.50 1.00
Figure 2. VDD vs ISTB
0.0 -200.0 0 1 2 3 VDD (V) 4 5 6
0.00 0 -0.50 VDD (V) 1 2 3 4 5 6
Figure 3. VDD vs IDD
1.20
1.040
Figure 4.IREF vs VREF (VDD = 3V)
1.00 0.80 VREF (V)
VREF (V)
1.020 1.000 0.980 0.960 0.940 0.920
0.60 0.40 0.20 0.00 0 -0.20 VDD (V) 1 2 3 4 5 6
0.900 0 1 2 IREF (mA) 3 4 5
Figure 3. RON vs IM (VDD = 3V)
1.6 1.40 1.4 RON1 1.2 RON2 RON (OHM) RON (OHM) 1.0 0.8 0.6 0.4 0.2 0.0 0.0 0.2 0.4 IM (A) 0.6 0.8 1.00 0.80 0.60 0.40 0.20 0.00 1 1.20
Figure 4.RON vs VM (VDD = 3V)
RON1
RON2
2
3 VM (V)
4
5
11 FAN8705 Rev. 1.0.1
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FAN8705 5 Channel DSC Motor Driver
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,.
V MOTOR = V ADJ1 x 4.9 - V DSON V ADJ1 x 4.9 = 3.6V
when, Gain1 = high
2 2 V MOTOR = V ADJ1 x -- x 4.9 - V DSON V ADJ1 x -- x 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 0.1V@300mA. 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 = -- x V ref 4
VM1 IN1,2 IN3,4
R Vref
OUT1,3
L
ADJ1 VADJ1 RADJ1
R
4.9X
H
Constant Voltage H-bridge CH1,2 OUT2,4
2R
PGND1 GAIN1
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FAN8705 5 Channel DSC Motor Driver
1.1 Stepping-Motor Drive 1.1.1 Three Input 2-2 Phase Excitation
SEL
IN1/IN3
L H
IN2
X L H H L
IN4
X L L H H
OUT1
Z H L L H
OUT2
Z L H H L
OUT3
Z H H L L
OUT4
Z L L H H
Function
Stand-by(Stop) S1 S2 S3 S4
H
H H 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 IN1 IN2 OUT1 Constant Voltage H-bridge CH1 Constant Voltage H-bridge CH2 STEP M OUT2 OUT3
DSP or Micom
IN3 IN4 VDD SEL
OUT4
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FAN8705 5 Channel DSC Motor Driver
1.1.2 Four Input 1-2 Phase Excitation Mode1 SEL IN1
L H L H H H H L H H
IN2
L L X H H H X L L
IN3
L H H H L H H H L
IN4
L L L L X H H H X
OUT1
Z H Z L L L Z H H
OUT2
Z L Z H H H Z L L
OUT3
Z H H H Z L L L Z
OUT4
Z L L L Z H H H Z
Function
Stand-by(Stop) S1 S2 S3 S4 S5 S6 S7 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 IN1 IN2 OUT1 Constant Voltage H-bridge CH1 Constant Voltage H-bridge CH2 STEP M OUT2 OUT3
DSP or Micom
IN3 IN4 VDD SEL
OUT4
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FAN8705 5 Channel DSC Motor Driver
1.1.3 Four Input 1-2 Phase Excitation Mode2 SEL IN1
L H H L L L L L H H
IN2
L L H H H H L L L
IN3
L H H H H L L L L
IN4
L L L L H H H H L
OUT1
Z H Z L L L Z H H
OUT2
Z L Z H H H Z L L
OUT3
Z H H H Z L L L Z
OUT4
Z L L L Z H H H Z
Function
Stand-by(Stop) S1 S2 S3 S4 S5 S6 S7 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 IN2 OUT1 STEP M OUT2 OUT3
DSP or Micom
IN3 IN4
Constant Voltage H-bridge CH1 Constant Voltage H-bridge CH2
OUT4
SEL
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FAN8705 5 Channel DSC Motor Driver
1.1.4 Pseudo Sine Wave Excitation SEL IN1
L H H L L L L L H H
IN2
L L H H H H L L L
IN3
L H H H H L L L L
IN4
L L L L H H H H L
GAIN1
X H L H L H L H L
OUT1
Z H Z L L L Z H H
OUT2
Z L Z H H H Z L L
OUT3
Z H H H Z L L L Z
OUT4
Z L L L Z H H H Z
Function
Stand-by(Stop) S1 S2 S3 S4 S5 S6 S7 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 IN1 IN2 OUT1 Constant Voltage H-bridge CH1 Constant Voltage H-bridge CH2 STEP M OUT2 OUT3
DSP or Micom
IN3 IN4 GAIN1 SEL
OUT4
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FAN8705 5 Channel DSC Motor Driver
2. Channel 3
CH3 is constant voltage driver. The output voltage can be calculated by following equations. When, Gain2 = low,.
V MOTOR = V ADJ2 x 4.9 - V DSON V ADJ2 x 4.9 = 3.6V
when, Gain2 = high
1 1 V MOTOR = V ADJ2 x -- x 4.9 - V DSON V ADJ2 x -- x 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 0.1V@300mA. 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 = -- x V ref 4
VM2 IN5,6
Vref R
OUT5
L
ADJ2 VADJ2 RADJ2
2R H R
4.9X
Constant Voltage H-bridge CH3 OUT6
Iris
PGND2 GAIN2
3. Channel 4
Channel 4 is operated by saturated H-bridge mode.
VM3 IN7 Saturated H-Bridge CH4 OUT8 PGND2 OUT7 DC M
IN8
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FAN8705 5 Channel DSC Motor Driver
4. Channel 5
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 x 1 3 I MOTOR = --------------------------------R Sense + R W
where, RW is internal bonding resistance and metal resistance is around 0.05
VM4 IN9,10
Vref 7R
OUT9
L
ADJ3 VADJ3 RADJ3
2R
Constant current H-bridge CH5 OUT10
Shutter
H R RW
FC1 FC2 GAIN3
RS RSense
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
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 current sensing terminal RS connected to ground.
VM4 VREF ADJ3 Voltage Reference OUT9 Constant current H-bridge CH5 OUT10 DC M
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 ADJ1/ ADJ2 4.9X IN1,2,3,4/ IN5,6 GAIN1/ GAIN2 Voltage Reference OUT1,3/ OUT5 Constant Voltage H-bridge CH1,2,3 DC M OUT2,4/ OUT6
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FAN8705 5 Channel DSC Motor Driver
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 IDLE OPEN tc2 OPEN 0 ~ OO WEAK CLOSE 20ms IDLE OPEN
Shutter motor
OPEN WEAK OPEN CLOSE to1 to2 20ms
Total Open Total Close
Shutter Speed t0 t1 Effective Exposure time t2 t3 t4 t5
Image Data Storing Start
To1 IN9 IN10 GAIN3 Ishutter T1
To2
T2
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FAN8705 5 Channel DSC Motor Driver
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 175C. It is intended to protect the device from failures due to excessive junction temperature. The Thermal Shutdown has the hysteresis of 25C approximately.
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FAN8705 5 Channel DSC Motor Driver
Typical Application Circuits 1
STEP M Auto-focus 3 OUT1 38 VM1 33 VM2 16 VM3 13 VM4 OUT2 4 OUT3 VM1 5 OUT4 6 OUT5 28 OUT6 VM2 Single iris 27 OUT7 26
DC M Zoom 25 OUT8 VM3 OUT9 7 OUT10 VM4 Shutter 8
Constant voltage H-bridge CH1
PGND1
Constant voltage H-bridge CH2
Constant voltage H-bridge CH3
PGND2
R
Saturated
H-bridge CH4
Constant current H-bridge CH5
RS 10
29 PGND2 2 PGND1
CH1,2
R
7R
ADJ3 20
4.9X
CH3 R
4.9X
2R
Gain control
Reference 1V
2R
2R
R
R
22
ADJ1
FC1
21
ADJ2
Feed back Compensation
9
FC2 11
CH1 CH2 CH3 CH4 CH5
23 VREF Output stage Output stage VDD
GAIN control
PS 19
TSD
UVLO
Reference out Logic GAIN1 GAIN2 GAIN3 15 14 12
Logic
SEL 18 IN1~IN10
17 SGND 24
DSP
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FAN8705 5 Channel DSC Motor Driver
Package Dimensions (Unit: mm)
Recommended Design
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FAN8705 5 Channel DSC Motor Driver
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