TECHNICAL NOTE
DC Brushless Motor Drivers for Cooling Fans
Speed Controllable
Single-phase Full-wave
DC Brushless Fan Motor Drivers
BD6709FS, BD6718FV, BD6721FS, BD6722FS
●Description
This is the summary of models that suit for 12V speed controllable fan for desktop PC and general consumer equipment.
They employ Bi-CDMOS process, and realize low ON resistance, low power consumption. They incorporate lock protection
and automatic restart circuit, current limiting circuit.
●Features
1) Power Tr incorporated (BD6709FS、BD6721FS)
2) Pre-driver compatible for external Tr (BD6718FV)
3) Low side power Tr incorporated half pre-driver (BD6722FS)
4) Current limiting circuit
5) PWM soft switching driver (BD6721FS、BD6722FS)
6) Soft start circuit (BD6722FS)
7) Lock protection and automatic restart circuit
8) Rotating speed pulse signal (FG) output
9) Lock alarm signal (AL) output (BD6718FV、BD6721FS、BD6722FS)
●
Application
For 12V fan for desktop PC, server and general consumer equipment
●Lineup
12V speed controllable
single-phase full-wave
Soft switching not available
Power Tr incorporated
Pre-driver
BD6709FS
BD6718FV
BD6721FS
BD6722FS
Soft switching available
Power Tr incorporated
Half pre-driver
Jan. 2007
●Absolute
Maximum Ratings
◎BD6709FS
Parameter
Symbol
Limit
17
812.5＊
-40½+95
-55½+150
1.2＊＊
10
15
150
Unit
V
mW
℃
℃
A
mA
V
℃
Supply voltage
Vcc
Power dissipation
Pd
Operation temperature
Topr
Storage temperature
Tstg
Output current
Iomax
FG signal output current
IFG
FG signal output voltage
VFG
Junction temperature
Tjmax
＊
Reduce by 6.5mW/℃ over 25℃.
(On 70.0mm×70.0mm×1.6mm glass epoxy board)
＊＊
This value is not to exceed Pd.
◎BD6718FV
Parameter
Symbol
Limit
15
812.5＊
-40½+95
-55½+150
36
15
20
8
15
8
15
4
8
150
Unit
V
mW
℃
℃
V
V
mA
mA
V
mA
V
mA
mA
℃
Supply voltage
Vcc
Power dissipation
Pd
Operation temperature
Topr
Storage temperature
Tstg
High side output voltage
VOH
Low side output voltage
VOL
Low side output current
Iomax
FG signal output current
IFG
FG signal output voltage
VFG
AL signal output current
IAL
AL signal output voltage
VAL
VREF current ability
IVREF
HB current ability
IHB
Junction temperature
Tjmax
＊
Reduce by 6.5mW/℃ over 25℃.
(On 70.0mm×70.0mm×1.6mm glass epoxy board)
◎BD6721FS
Parameter
Supply voltage
Power dissipation
Operation temperature
Storage temperature
Output current
FG signal output current
FG signal output voltage
AL signal output current
AL signal output voltage
VREF current ability
Junction temperature
＊
Symbol
Vcc
Pd
Topr
Tstg
Iomax
IFG
VFG
IAL
VAL
IVREF
Tjmax
Limit
20
812.5＊
-40½+100
-55½+150
1.0＊＊
10
20
10
20
8
150
Unit
V
mW
℃
℃
A
mA
V
mA
V
mA
℃
Reduce by 6.5mW/℃ over 25℃.
(On 70.0mm×70.0mm×1.6mm glass epoxy board)
＊＊
This value is not to exceed Pd.
2/40
◎BD6722FS
Parameter
Supply voltage
Power dissipation
Operation temperature
Storage temperature
High side output voltage
Low side output voltage
Low side output current
Signal output current
Signal output voltage
VREF current ability
VTH input voltage
Junction temperature
＊
Symbol
Vcc
Pd
Topr
Tstg
VOH
VOL
Iomax
IFG/IAL
VFG/VAL
IVREF
VVTH
Tjmax
Limit
20
812.5＊
-40½+100
-55½+150
34
34
1.5＊＊
10
20
8
15
150
Unit
V
mW
℃
℃
V
V
A
mA
V
mA
V
℃
Reduce by 6.5mW/℃ over 25℃.
(On 70.0mm×70.0mm×1.6mm glass epoxy board)
＊＊
This value is not to exceed Pd.
●OPERATING
CONDITIONS
◎BD6709FS
Parameter
Operating supply voltage range
Hall input voltage range
◎BD6718FV
Parameter
Operating supply voltage range
Hall input voltage range
Symbol
Vcc
VH
Limit
4.5½14.0
0½Vcc-2.0
Unit
V
V
Symbol
Vcc
VH
Limit
6.0½14.0
0.5½Vcc-1.5
Unit
V
V
◎BD6721FS
Parameter
Operating supply voltage range
Hall input voltage range
VTH input voltage range
VMIN input voltage range
◎BD6722FS
Parameter
Operating supply voltage range
Hall input voltage range
VMIN input voltage range
Symbol
Vcc
VH
VVMIN
Limit
5.0½17.0
0½Vcc-2.0
0½Vcc-2.0
Unit
V
V
V
Symbol
Vcc
VH
VVTH
VVMIN
Limit
5.0½17.0
0½Vcc-2.0
0½Vcc-2.0
0½Vcc-2.0
Unit
V
V
V
V
3/40
●ELECTRICAL
CHARACTERISTICS(Unless otherwise specified Ta=25℃,Vcc=12V)
◎BD6709FS
Parameter
Circuit current
Hall input hysteresis
Output low voltage
Output high voltage
Lock detection ON time
Lock detection OFF time
FG output low voltage
FG output leak current
OSC low voltage
OSC high voltage
OSC frequency
Level amp gain
Level amp output low voltage
Level amp output high voltage
VREF voltage
CL-CS offset voltage
Symbol
Icc
VHYS
VOL
VOH
TON
TOFF
VFGL
IFGL
VOSCL
VOSCH
FOSC
GLA
VLAOL
VLAOH
VREF
Vcofs
Limit
Min.
3.0
±5
-
-
0.30
2.5
-
-
1.5
3.0
-
50
-
-
4.0
-
Typ.
6.0
±10
0.2
0.2
0.50
4.0
-
-
2.0
3.5
25 *
-
0.9
1.2
4.4
-
Max.
9.0
±15
0.3
0.3
0.70
5.5
0.3
50
2.5
4.0
-
-
1.2
1.5
4.8
30
Unit
mA
mV
V
V
sec
sec
V
μA
V
V
kHz
dB
V
V
V
mV
Conditions
Characteristics
Fig.1
Fig.2
Fig.3,4
Fig.5,6
Fig.7
Fig.8
Fig.9,10
-
Fig.11
FIg.12
-
-
-
-
Fig.14,15
Io=200mA
Io=-200mA
Voltage between output and
Vcc
IFG=5mA
VFG=15V
COSC=470pF
ILAOUT=1mA
ILAOUT=-1mA
Voltage between output and
Vcc
IVREF=-1mA
*
This voltage is reference, not guarantee.
◎BD6718FV
Parameter
Circuit current
Hall input hysteresis
H side output current
H side output leak current
L side output high voltage
L side output low voltage
Lock detection ON time1
Lock detection OFF time1
Lock detection ON time2
Lock detection OFF time2
FG output low voltage
AL output low voltage
FG output leak current
AL output leak current
OSC low voltage
OSC high voltage
OSC frequency
VREF voltage
Hall bias voltage
CR current ability
CR output low voltage
CR discharge time
Symbol
Icc
VHYS
IH
IHL
VLH
VLL
TON1
TOFF1
TON2
TOFF2
VFGL
VALL
IFGL
IALL
VOSCL
VOSCH
FOSC
VREF
VHB
ICR
VCR
TCR
Limit
Min.
4.0
±5
5
-
-
-
0.15
1.5
0.15
3.0
-
-
-
-
0.4
1.2
-
2.2
1.2
3
-
9
Typ.
8.0
±10
10
-
0.2
0.2
0.3
3.0
0.3
6.0
0.3
0.3
-
-
0.7
1.5
25 *
2.5
1.5
-
0.3
18.5
Max.
12.0
±15
20
100
0.35
0.35
0.5
5.0
0.5
10
0.4
0.4
50
50
1.0
1.8
-
2.8
1.8
-
0.5
28
Unit
mA
mV
mA
μA
V
V
sec
sec
sec
sec
V
V
μA
μA
V
V
kHz
V
V
mA
V
μsec
Io=-10mA
Voltage between output and
Vcc
Io=10mA
SEL(6PIN)：OPEN or H
SEL(6PIN)：OPEN or H
SEL(6PIN)=L
SEL(6PIN)=L
IFG=5mA
IAL=5mA
VFG=15V
VAL=15V
Conditions
Characteristics
Fig.16
Fig.17
Fig.18
-
Fig.19
Fig.20
Fig.21
Fig.22
Fig.21
Fig.23
Fig.24
Fig.24
-
-
Fig.25
Fig.26
-
Fig.27
Fig.28
-
Fig.29
Fig.30
COSC=470pF
IVREF=-1mA
VCR=1.5V
ICR=0.5mA
*
This voltage is reference, not guarantee.
4/40
◎BD6721FS
Parameter
Circuit current
Hall input hysteresis
Output voltage
Lock detection ON time
Lock detection OFF time
FG output low voltage
FG output leak current
AL output low voltage
AL output leak current
OSC low voltage
OSC high voltage
OSC charge current
OSC discharge current
Level amp gain
Level amp output low voltage
Level amp output high voltage
Output ON Duty 1
Symbol
Icc
VHHYS
VO
TON
TOFF
VFGL
IFGL
VALL
IALL
VOSCL
VOSCH
ICOSC
IDOSC
GLA
VLAOL
VLAOH
DUTY1
Limit
Min.
4.0
±5
-
0.30
3.0
-
-
-
-
0.8
2.3
-50
26
50
-
-
85
Typ.
7.0
±10
0.6
0.50
5.0
0.15
-
0.15
-
1.0
2.5
-32
32
-
0.2
1.6
90
Max.
10.0
±15
0.9
0.70
7.0
0.3
50
0.3
50
1.2
2.7
-26
50
-
0.3
2.0
95
Unit
mA
mV
V
sec
sec
V
μA
V
μA
V
V
μA
μA
dB
V
V
%
Voltage between LAOUT and
Vcc
VTH=VREF*0.383
OUT1=Pull up 1kΩ
COSC=470pF
VTH=VREF*0.583
OUT1=Pull up 1kΩ
COSC=470pF
VTH=VREF*0.783
OUT1=Pull up 1kΩ
COSC=470pF
IVREF=-2mA
IFG=5mA
VFG=17V
IAL=5mA
VAL=17V
Io=300mA
Upper and Lower total
Conditions
Characteristics
Fig.31
Fig.32
Fig.33½36
Fig.37
Fig.38
Fig.39,40
Fig.41
Fig.39,40
Fig.41
Fig.42
Fig.43
Fig.44
Fig.44
-
-
-
-
Output ON Duty 2
DUTY2
45
50
55
%
-
Output ON Duty 3
VREF voltage
Current limit voltage
VTH input bias current
VMIN input bias current
DUTY3
VREF
VCL
IVTH
IVMIN
5
2.8
290
-
-
10
3.0
310
-
-
15
3.2
330
0.2
0.2
%
V
mV
μA
μA
-
Fig.45
Fig.46
Fig.47
Fig.48
5/40
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