Document
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 Soft switching available
Power Tr incorporated BD6709FS
Pre-driver
BD6718FV
Power Tr incorporated BD6721FS
Half pre-driver
BD6722FS
Jan. 2007
●Absolute Maximum Ratings
◎BD6709FS
Parameter
Symbol
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
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
Symbol
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
AL signal output current
IAL
AL signal output voltage
VAL
VREF current ability
IVREF
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.
Limit
17 812.5* -40~+95 -55~+150 1.2**
10 15 150
Limit
15 812.5* -40~+95 -55~+150
36 15 20 8 15 8 15 4 8 150
Limit
20 812.5* -40~+100 -55~+150 1.0**
10 20 10 20 8 150
2/40
Unit
V mW ℃ ℃
A mA V ℃
Unit
V mW ℃ ℃
V V mA mA V mA V mA mA ℃
Unit
V mW ℃ ℃
A mA V mA V mA ℃
◎BD6722FS
Parameter
Symbol
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
Signal output current
IFG/IAL
Signal output voltage
VFG/VAL
VREF current ability
IVREF
VTH input voltage
VVTH
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.
Limit
20 812.5* -40~+100 -55~+150
34 34 1.5** 10 20 8 15 150
Unit
V mW ℃ ℃
V V A mA V mA V ℃
●OPERATING CONDITIONS ◎BD6709FS Parameter Operating supply voltage range Hall input voltage range
◎BD6718FV Parameter
Operating supply voltage range Hall input voltage range
◎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
Limit 6.0~14.0 0.5~Vcc-1.5
Symbol Vcc VH
Limit 4.5~14.0 0~Vcc-2.0
Unit V V
Unit V V
Symbol
Vcc VH VVTH VVMIN
Limit
5.0~17.0 0~Vcc-2.0 0~Vcc-2.0 0~Vcc-2.0
Symbol
Vcc VH VVMIN
Limit
5.0~17.0 0~Vcc-2.0 0~Vcc-2.0
Unit V V V V
Unit V V V
3/40
●ELECTRICAL CHARACTERISTICS(Unless otherwise specified Ta=25℃,Vcc=12V)
◎BD6709FS
Parameter
Circuit current Hall input hysteresis Output low voltage
Symbol
Limit
Min. Typ. Max.
Icc 3.0 6.0 9.0
VHYS
±5 ±10 ±15
VOL
- 0.2 0.3
Output high voltage
VOH
- 0.2 0.3
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
TON
0.30 0.50 0.70
TOFF 2.5 4.0 5.5
VFGL
-
- 0.3
IFGL
-
- 50
VOSCL 1.5 2.0 2.5
VOSCH 3.0 3.5 4.0
FOSC
- 25 * -
GLA 50 -
-
VLAOL
-
0.9 1.2
Level amp output high voltage
VLAOH
-
1.2 1.5
VREF voltage CL-CS offset voltage
VREF 4.0 4.4 4.8
Vcofs
-
- 30
* This voltage is reference, not guarantee.
Unit
Conditions
Characteristics
mA Fig.1
mV Fig.2
V Io=200mA
Fig.3,4
Io=-200mA
V Voltage between output and Fig.5,6
Vcc
sec Fig.7
sec Fig.8
V IFG=5mA
.