Datasheet
DC Brushless Fan Motor Driver
5V Single-phase Full wave
Fan motor driver
BH6799FVM
●Description
This is the summary of models that suit for notebook PC cooling fan motor. They employ Bi-CMOS process and realize low
ON resistance, low power consumption and quiet drive.
●Features
■
Compact package (MSOP8)
■
BTL soft switching drive
■
Constant voltage output for hall element
■
Lock protection and auto restart
(without external capacitor)
■
Rotating speed pulse signal (FG) output
●Package(s)
MSOP8
W(Typ.) x D(Typ.) x H(Max.)
2.90mm x 4.00mm x 0.90mm
●Application
■
Compact 5V fan such as notebook PC cooling fan
MSOP8
●Absolute
maximum ratings
Parameter
Supply voltage
Power dissipation
Operating temperature
Storage temperature
Output current
FG signal output voltage
FG signal output current
Junction temperature
*
**
Symbol
Vcc
Pd
Topr
Tstg
Iomax
Vfg
Ifg
Tjmax
Limit
7
585*
-40 to +105
-55 to +150
1000**
7
5
150
Unit
V
mW
℃
℃
mA
V
mA
℃
Reduce by 4.68mW/℃ over Ta=25ºC(70.0mm×70.0mm×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
2.0 to 6.0
0.4 to Vcc-1.1
Unit
V
V
○Product
structure：Silicon monolithic integrated circuit
○This
product is not designed protection against radioactive rays
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TSZ02201-0H1H0B100120-1-2
© 2012 ROHM Co., Ltd. All rights reserved.
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TSZ22111・14・001
11.Jul.2012
Rev.001
BH6799FVM
●Electrical
characteristics(Unless
otherwise specified Ta=25℃,Vcc=5V)
Parameter
Circuit current
Input offset voltage
Output voltage
Input-output Gain
FG low voltage
Input hysteresis voltage
Lock detection ON time
Lock detection OFF time
Hall bias voltage
Symbol
Icc
Vhofs
Vo
Gio
Vfgl
Vhys
Ton
Toff
Vhb
Limits
Min.
-
-
-
45
-
±5
0.35
3.5
1.1
Typ.
5
-
0.32
48
-
±10
0.50
5.0
1.3
Max.
8
±6
0.49
51
0.3
±15
0.65
6.5
1.5
Unit
mA
mV
V
dB
V
mV
s
s
V
Ihb=5mA
Ifg=3mA
Io＝250mA
Upper and Lower total
Conditions
Datasheet
Characteristics
Fig.1
-
Fig.2,3
-
Fig.4
Fig.5
Fig.6
Fig.7
Fig.8
●
Truth table
H+
H
L
H-
L
H
OUT1
H
L
OUT2
L
H
FG
L(Output Tr：ON)
H(Output Tr：OFF)
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© 2012 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0H1H0B100120-1-2
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BH6799FVM
●Reference
data
6
Datasheet
1.0
0.0
5
0.8
-0.2
-40
℃
Circuit current , Icc [mA]
Output L voltage [V]
Output L voltage [V]
4
105
℃
25
℃
-40
℃
Output H voltage [V]
Output H voltage [V]
25
℃
-0.4
0.6
105℃
25℃
-40℃
3
105
℃
-0.6
0.4
2
0.2
1
-0.8
Operating Voltage Range
0
0
2
4
6
8
0.0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
-1.0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Supply voltage, Vcc[ V]
Output current, Io[A]
Output current, Io [A]
Fig.1 Circuit current
Fig.2 Output L voltage
Fig.3 Output H voltage
0.5
20
1.0
105
℃
25
℃
Input hysteresis voltage, Vhys [mV]
FG low voltage, Vfgl [V]
FG low voltage, Vfgl [V]
0.4
Lock detection ON time, Ton [s]
Lock detection ON time, Ton [s]
15
10
0.8
-40
℃
5
0
-5
-40
℃
-10
-15
-20
25
℃
105
℃
Operating Voltage Range
0.3
0.6
-40
℃
25
℃
0.2
2V
0.1
5V
6V
0.4
105
℃
0.2
Operating Voltage Range
0.0
0.0
0
1
2
3
4
5
0
2
4
6
8
0.0
2.0
4.0
6.0
8.0
FG current, Ifg[mA]
Supply voltage,Vcc[V]
Supply voltage, Vcc[V]
Fig.4 FG low voltage
Fig.5 Input hysteresis voltage
Fig.6 Lock detection ON time
7.0
Lock detection OFF time, Toff [s]
6.5
6.0
5.5
25
℃
-40
℃
1.6
105
℃
25
℃
Hall bias voltage, Vhb [V]
Hall bias voltage, Vhb [V]
1.2
-40
℃
5.0
4.5
4.0
3.5
3.0
0
2
4
6
8
Supply voltage, Vcc[V]
Operating Voltage Range
105
℃
0.8
0.4
0.0
0
2
4
6
8
10
Hall bias current, Ihb[mA]
Fig.7 Lock detection OFF time
Fig.8 Hall bias voltage
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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TSZ02201-0H1H0B100120-1-2
11.Jul.2012 Rev.001
BH6799FVM
●Block
diagram, application circuit, and pin assignment
M
Datasheet
OUT2
1
GND
8
Incorporates soft switching
function. Adjust at an
optimum value because
gradient of switching of
output waveform depends on
hall element output.
P.5
H+
2
OSC
Lock
Protection
TSD
OUT1
7
Take a measure against
Vcc voltage rise due to
reverse connection of
power supply and back
electromotive force.
HB
HALL
3
HALL
Bias
Vcc
6
P.7
H-
4
FG
5
This is an open drain
output. Connect a
pull-up resistor.
P.8
OSC : Internal reference oscillation circuit
TSD : Thermal shut down(heat rejection circuit)
PIN No.
1
2
3
4
5
6
7
8
Terminal name
OUT2
H+
HB
H-
FG
Vcc
OUT1
GND
Function
Motor output terminal 2
Hall input terminal+
Hall bias terminal
Hall input terminal-
FG signal output terminal
Power supply terminal
Motor output terminal 1
GND terminal
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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TSZ02201-0H1H0B100120-1-2
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BH6799FVM
●
Description of operations
Datasheet
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.9.
Idling
H+
OUT1
Toff
Ton
OUT2
Output Tr OFF
ON
FG
Motor
locking
Lock
detection
Depends on hall signal.
(H in this figure)
Lock
Recovers
release normal
operation
Fig.9 Lock protection timing chart
2) Soft switching function (silent drive setting)
Input signal to hall amplifier is amplified to produce an output signal.
When the hall element output signal is small, the gradient of switching of output waveform is gentle; When it is large,
the gradient of switching of output waveform is steep. Enter an appropriate hall element output to IC where output
waveform swings sufficiently.
(H+)-(H-)
OUT1
Fig.10 Relation between hall element output amplitude and output waveform
3) Hall input setting
Hall input voltage range is shown in operating conditions.
Vcc
Vcc-1.1V
Hall input voltage range
0.4V
GND
Fig.11 Hall input voltage range
Adjust the value of hall element bias resistor R1 in Fig.12 so that the input voltage of a hall amplifier is input in "hall
input voltage range" including signal amplitude.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/10
TSZ02201-0H1H0B100120-1-2
11.Jul.2012 Rev.001
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