Datasheet
DC Brushless Fan Motor Driver
Standard Single-phase Full wave
Fan motor driver
BD6968FVM
●Description
This is the summary of application for BD6968FVM. BD6968FVM can drive FAN motor silently by BTL soft switching, and it
can control rotational speed by direct PWM and DC voltage speed control.
●
Features
Small package (MSOP10)
BTL soft switching drive
PWM speed control
Direct PWM and DC voltage control available
Low duty start up function
Quick start function
Constant voltage output for hall element
Lock protection and auto restart
(without external capacitor)
Lock alarm signal (AL) outputt
●
Applications
PC, PC peripheral component
(Power supply, VGA card, case FAN etc.)
BD player, Projector etc.
●Absolute
maximum ratings
●
Package(s)
MSOP10
W(Typ.) x D(Typ.) x H(Max.)
2.90mm x 4.00mm x 0.90mm
MSOP10
Parameter
Supply voltage
Power dissipation
Operating temperature
Storage temperature
Output voltage
Output current
Hall input terminal voltage
PWM terminal voltage
AL signal output voltage
AL signal output current
HB output current
REF output current
Junction temperature
*
**
Symbol
Vcc
Pd
Topr
Tstg
Vomax
Iomax
Vhall
Vpwm
Val
Ial
Ihb
Iref
Tjmax
Limit
15
585*
-40 to +105
-55 to +150
15
800**
7
7
15
10
10
10
150
Unit
V
mW
℃
℃
V
mA
V
V
V
mA
mA
mA
℃
Reduce by 4.68mW/℃ over Ta=25ºC(On 70mm×70mm×1.6mm glass epoxy board)
This value is not to exceed Pd
●Operating
conditions
Parameter
Operating supply voltage range
Hall input voltage range
Symbol
Vcc
Vh
Limit
3.3 to 14
0.4 to Vcc/3
Unit
V
V
○Product
structure：Silicon monolithic integrated circuit
○This
product is not designed protection against radioactive rays
.
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TSZ22111・14・001
21.Mar.2013 Rev.002
BD6968FVM
●Electrical
characteristics(Unless
otherwise specified Ta=25℃,Vcc=12V)
Limit
Typ.
5
2.8
1.2
-
55
0.45
-
-
-
-0.1
2.5
0.5
66
60
30
0.2
-
0.5
5.0
Datasheet
Parameter
Circuit current
REF voltage
Hall bias voltage
Hall input offset
Input-output Gain
Output voltage
PWM input H level
PWM input L level
PWM input frequency
PWM terminal bias current
OSC H voltage
OSC L voltage
OSC frequency
Output PWM Duty 1
Output PWM Duty 2
AL L voltage
AL leak current
Lock detection ON time
Lock detection OFF time
Symbol
Icc
Vref
Vhb
Vofs
Gio
Vo
Vpwmh
Vpwml
Fpwm
Ipwm
Vosch
Voscl
Fosc
Duty1
Duty2
Vall
Iall
Ton
Toff
Min.
3
2.6
1.1
0
53
0.20
2.7
-0.3
2
-5.0
2.3
0.4
44
50
20
-
0
0.35
3.5
Max.
7
3.0
1.3
±6
57
0.70
7.0
0.4
88
-
2.7
0.6
88
70
40
0.4
5
0.65
6.5
Unit
Conditions
Characteristics
Fig.1
mA
V
V
mV
dB
V
V
V
kHz
μA
V
V
kHz
%
%
V
μA
s
s
*
*
PWM drive frequency at
DC voltage input mode
Vpwm=1.9V
Vpwm=1.3V
Ial=5mA
Val=15V
Io=200mA
Upper and Lower total
direct PWM input condition
direct PWM input condition
direct PWM input condition
Iref=-3mA
Ihb=-3mA
Fig.2
Fig.2
-
-
Fig.3 to 6
-
-
-
-
Fig.7
Fig.7
Fig.8
-
-
Fig.9,10
-
Fig.11
Fig.12
* Peak voltage of triangular wave (OSC) inside IC
●Terminal
name
PIN No.
1
2
3
4
5
6
7
8
9
10
●Truth
table
H+
H
L
H
L
H-
L
H
L
H
PWM
H
H
L
L
OUT1
H
L
L
L
OUT2
L
H
L
L
Terminal name
GND
OUT2
H+
HB
H-
AL
PWM
REF
Vcc
OUT1
Function
GND
Motor output 2
Hall input +
Constant voltage output for hall element
Hall input -
Lock alarm signal output
Control signal input (PWM or DC voltage)
Reference voltage output
Power supply terminal
Motor output 1
AL normal operation :L(output is ON)
lock detection
:H(output is OFF)
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TSZ02201-0H1H0B100050-1-2
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Rev.002
BD6968FVM
●Reference
data
8
105℃
Datasheet
3.0
Vref
1.6
HB/REF voltage, Vhb/Vref [V]
2.5
2.0
1.5
3.3V
Circuit current, Icc [mA]
25℃
-40℃
Output H v olt age [V]
6
105℃
25℃
1.2
12V
14V
4
-40℃
0.8
Vhb
1.0
105℃
2
Operating Voltage Range
0.4
0.5
0.0
25℃
-40℃
0
3
6
9
12
15
Supply voltage,Vcc [V]
0.0
0
2
4
6
8
10
0.0
0.2
0.4
0. 6
0.8
Output current, Ihb,Iref [mA]
Output current , Io [A]
Fig. 1 Circuit current
Fig. 2 REF,HB Voltage
Fig.3 Output H voltage
(Voltage characteristics)
1.0
2.0
105℃
1.0
3.3V
1.6
Output H voltage [V]
Output L voltage [V]
25℃
0.8
Output L voltage [V]
0.8
105℃
1.2
-40℃
0.6
12V
0.6
25℃
-40℃
0.8
0.4
14V
0.4
0.4
0.2
0.2
0.0
0.0
0.2
0.4
0.6
0.8
Output Current, Io [mA]
0.0
0.0
0.2
0.4
0.6
0.8
Output current, Io [A]
0.0
0.0
0.2
0.4
0.6
0.8
Output current, Io [A]
Fig.4 Output H voltage
(Temperature characteristics)
3.0
OSC L/ H voltage, Voscl/Vosch [ V]
Vo sch
Fig.5 Output L voltage
(Voltage characteristics)
100
Fig.6 Output L voltage
(Temperature characteristics)
1.0
3.3V
OSC frequency, F
OSC
[ kHz]
2.5
105℃
25℃
- 40
℃
80
2.0
1.5
60
- 40
℃
AL L voltage, Vall [V]
105
℃
25
℃
0.8
0.6
Operating Voltage Range
40
0.4
12V
1.0
105℃
25℃
20
15V
0.5
Voscl
- 40℃
Operating Voltage Range
0.2
0.0
3
6
9
12
15
0
3
6
9
12
15
0.0
0
2
4
6
8
10
Supply voltage, Vcc [V]
Supply v olt age, Vc c [V]
Output current, Ial [mA]
Fig. 7 OSC H/L voltage
Fig. 8 OSC frequency
Fig.9 AL L voltage
(Voltage characteristics)
8
Lock detection OFF time, Toff [s]
1.0
Lock detection ON time, Ton [s]
0.8
0.8
AL L voltage, Vall [V]
0.6
105℃
25℃
6
105℃
25℃
-40℃
Operating Voltage Range
0.6
105℃
0.4
25℃
0.4
Operating Voltage Range
-40℃
4
0.2
-40℃
0.0
0
2
4
6
8
10
Output current, Ial [mA]
0.2
3
6
9
12
15
Supply voltage, Vcc [V]
2
3
6
9
12
15
Supply voltage, Vcc [V]
Fig.10 AL L voltage
(Temperature characteristics)
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© 2013 ROHM Co., Ltd. All rights reserved.
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Fig. 11 Lock detection ON time
Fig. 12 Lock detection OFF time
3/12
TSZ02201-0H1H0B100050-1-2
21.Mar.2013
Rev.002
BD6968FVM
●Block
diagram, application circuit, and pin assignment (Constant etc are for reference)
Datasheet
1)Direct PWM speed control
FAN speed is controlled by FAN controller PWM output. IC output PWM duty is changed directly by input PWM signal.
H level input is motor active, L level input is motor stop.
M
OUT1
Take a measure against Vcc
voltage rise due to reverse
connection of power supply
and back electromotive
force.
P.9
Vcc
GND
1
-
+
10
Incorporates soft switching
function. Adjust at an
optimum value because
gradient of switching of
output waveform depends on
hall element output.
P.6
OUT2
2
H+
Lock
Protection
+
-
9
0.1uF
to1uF
REF
3
HB
Control
TSD
8
PWM
FAN rotational speed
is controlled by input
PWM signal directly.
P.7
HALL
0Ω to
500Ω
4
Hall
Bias
+
-
7
H-
AL
5
OSC
+
-
6
REF
8
1kΩ
to 100kΩ
PWM
OSC : Internal reference oscillation circuit
TSD :Thermal shut down(heat rejection circuit)
If controller output is open drain
output, connect pull-up resistor to
REF terminal.
7
2)DC voltage speed control
Output PWM duty is varied by input voltage. When input voltage level is low, output PWM duty is low. The voltage
range of output duty changes is between OSC L voltage and OSC H voltage. When the input voltage is around OSC L
(about 0.5V), rotational speed of the motor may fluctuate because of the low duty start-up function operates repeatedly,.
The recommend voltage is higher than 0.7V.
M
OUT1
GND
1
-
+
10
OUT2
Vcc
2
H+
Lock
Protection
+
-
9
0.1uF
to 1uF
REF
3
HB
Control
TSD
8
0.01uF
to 0.1uF
HALL
0Ω to
500Ω
4
Hall
Bias
+
-
PWM
FAN rotational speed
is controlled by PWM
terminal DC voltage.
P.7
7
H-
AL
5
OSC
+
-
6
This is an open drain
output. Connect a pull
up resistor.
P.10
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BD6968FVM
Datasheet
3) Rotational speed adjusting application
This application circuit can set the FAN rotational speed without the change of motor coil by changing resistor value of
PCB. The adjusting range of rotational speed is slower than full speed of the motor.
M
GND
OUT1
1
-
+
10
Vcc
OUT2
2
H+
Lock
Protection
+
-
9
0.1uF
to 1uF
REF
3
HB
Control
TSD
8
R1
HALL
0Ω to
500Ω
4
Hall
Bias
PWM
0.01uF
to 0.1uF
7
+
-
R2
H-
AL
Drive duty can be
adjusted by the value
of R1 and R2.
P.7
5
OSC
+
-
6
R1,R2
：1kΩ
to 100kΩ
*If you use only full speed, connect the PWM terminal to REF terminal.
●
Description of operations
1) Lock protection and automatic restart circuit
Motor rotation is detected by hall signal, and lock detection ON time (Ton) and lock detection OFF time (Toff) are set
by IC internal counter. External part (C or R) is not required. Timing chart is shown in Fig.13.
Idling
H+
OUT1
Toff
Ton
OUT2
OutputTr OFF
Ton
ON
AL
Motor
Lock
locking detection
Recovers
Lock
release normal
operation
Fig.13 Lock protection timing chart
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TSZ02201-0H1H0B100050-1-2
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Rev.002
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