Datasheet
DC Brushless Fan Motor Drivers
Multifunction Single-phase Full-wave
Fan Motor Driver
BD6721FS
●General
description
BD6721FS is a 1chip driver that composes H-bridge of
power DMOS FET.
Moreover, because the level amplifier is installed, the
temperature control by the thermistor is also easy.
●Features
Driver including power DMOS FET
Speed controllable by DC / direct PWM input
PWM soft switching
Quick start
Current limit
Lock protection and automatic restart
Rotation speed pulse signal (FG) output
Lock alarm signal (AL) output
●Application
Fan motors for general consumer equipment of desktop PC, and Projector, etc.
●Absolute
maximum ratings
Parameter
Supply voltage
Power dissipation
Operating temperature range
Storage temperature range
Output voltage
Output current
Rotation speed pulse signal (FG) output voltage
Rotation speed pulse signal (FG) output current
Lock alarm signal (AL) output voltage
Lock alarm signal (AL) output current
Reference voltage (REF) output current
Junction temperature
*1
*2
●Package
SSOP-A16
W (Typ.) x D (Typ.) x H (Max.)
6.60mm x 6.20mm x 1.71mm
SSOP-A16
Symbol
Vcc
Pd
Topr
Tstg
Vo
Io
Vfg
Ifg
Val
Ial
Iref
Tj
Limit
20
*1
812.5
–40 to +100
–55 to +150
20
1.0
*2
20
10
20
10
8
150
Unit
V
mW
°C
°C
V
A
V
mA
V
mA
mA
°C
Reduce by 6.5mW/°C over Ta=25°C. (On 70.0mm×70.0mm×1.6mm glass epoxy board)
This value is not to exceed Pd.
●Recommended
operating conditions
Parameter
Operating supply voltage range
Operating input voltage range
(H+, H–, TH, MIN, LAIN) (more than Vcc=9V)
Operating input voltage range
(H+, H–, TH, MIN, LAIN) (less than Vcc=9V)
Symbol
Vcc
Limit
4.5 to 17.0
0 to 7
Vin
0 to Vcc–2
V
Unit
V
V
○Product
structure：Silicon monolithic integrated circuit
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This
product is not designed protection against radioactive rays
1/13
TSZ02201-0H1H0B100170-1-2
28.JUL.2012 Rev.002
BD6721FS
●Pin
configuration
(TOP VIEW)
GND
OSC
LAOUT
LAIN
TH
MIN
OUT1
RNF
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AL
FG
REF
H–
H+
Vcc
CS
OUT2
Datasheet
●Pin
description
P/No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
T/Name
GND
OSC
LAOUT
LAIN
TH
MIN
OUT1
RNF
OUT2
CS
Vcc
H+
H–
REF
FG
AL
Function
Ground terminal (signal ground)
Oscillating capacitor connecting
terminal
Level amplifier output terminal
Level amplifier input terminal
Output duty controllable input terminal
Minimum output duty setting terminal
Motor output terminal 1
Output current detecting resistor
connecting terminal (motor ground)
Motor output terminal 2
Output current detection terminal
Power supply terminal
Hall + input terminal
Hall – input terminal
Reference voltage output terminal
Speed pulse signal output terminal
Lock alarm signal output terminal
Fig.1 Pin configuration
●Block
diagram
GND
PWM SOFT
SWITCHING
SIGNAL
OUTPUT
1
TSD
AL
16
2
OSC
OSC
PWM
COMP
SIGNAL
OUTPUT
FG
15
3
LA
OUT
REF
CONTROL
LOGIC
HALL
AMP
REF
14
4
LA
IN
LEVEL
AMP
PWM
COMP
H–
HALL
COMP
13
5
TH
MIN
QUICK
START
PRE-
DRIVER
LOCK
PROTECT
H+
12
6
Vcc
Vcl
11
7
OUT1
CS
CURRENT
LIMIT COMP
10
8
RNF
OUT2
9
Fig.2 Block diagram
●I/O
truth table
Hall input
H+
H–
H
L
L
H
Driver output
OUT1
OUT2
L
H
H
L
FG
Hi-Z
L
H; High, L; Low, Hi-Z; High impedance
FG output is open-drain type.
Motor state
Rotating
Locking
L; Low, Hi-Z; High impedance
AL output is open-drain type.
AL
L
Hi-Z
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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TSZ02201-0H1H0B100170-1-2
28.JUL.2012 Rev.002
BD6721FS
●Electrical
characteristics(Unless otherwise specified Ta=25°C, Vcc=12V)
Parameter
Circuit current
Hall input hysteresis voltage
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 high voltage
OSC low voltage
OSC charge current
OSC discharge current
Level amplifier gain
Level amplifier output high voltage
Level amplifier output low voltage
Output ON duty 1
Output ON duty 2
Output ON duty 3
Reference voltage
Current limit setting voltage
TH input bias current
MIN input bias current
Symbol
Icc
Vhys
Vo
Ton
Toff
Vfgl
Ifgl
Vall
Iall
Vosch
Voscl
Icosc
Idosc
Gla
Vlaoh
Vlaol
Poh1
Poh2
Poh3
Vref
Vcl
Ith
Imin
Min.
4
±5
-
0.3
3.0
-
-
-
-
2.3
0.8
–50
26
50
-
-
85
45
5
2.8
290
-
-
Limit
Typ.
7
±10
0.6
0.5
5.0
0.15
-
0.15
-
2.5
1.0
–32
32
-
1.6
0.2
90
50
10
3.0
310
-
-
Max.
10
±15
0.9
0.7
7.0
0.30
10
0.30
10
2.7
1.2
–26
50
-
2.0
0.3
95
55
15
3.2
330
–0.2
–0.2
Unit
mA
mV
V
s
s
V
µA
V
µA
V
V
µA
µA
dB
V
V
%
%
%
V
mV
µA
µA
Io=±300mA,
High and low side total
Conditions
Datasheet
Ref.
data
Fig.3
Fig.4
Fig.5 to 8
Fig.9
Fig.10
Fig.11, 12
Fig.13
Fig.11, 12
Fig.13
Fig.14
Fig.14
Fig.15
Fig.15
Fig.16, 17
Fig.18
Fig.19
-
-
-
Fig.20, 21
Fig.22
Fig.23
Fig.24
Ifg=5mA
Vfg=17V
Ial=5mA
Val=17V
For Vcc voltage
Vth=Vref x 0.383
Output 1kΩ, OSC=470pF
Vth=Vref x 0.583
Output 1kΩ, OSC=470pF
Vth=Vref x 0.783
Output 1kΩ, OSC=470pF
Iref=–2mA
Vth=0V
Vmin=0V
About a current item, define the inflow current to IC as a positive notation, and the outflow current from IC as a negative notation.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
3/13
TSZ02201-0H1H0B100170-1-2
28.JUL.2012 Rev.002
BD6721FS
●Typical
performance curves(Reference data)
Datasheet
10
Hall input hysteresis voltage: Vhys[mV]
20
8
Circuit current: Icc[mA]
25°C
100°C
–40°C
10
100°C
25°C
–40°C
6
0
Operating range
–40°C
25°C
100°C
4
-10
2
Operating range
0
0
5
10
15
20
-20
0
5
10
15
20
Supply voltage: Vcc[V]
Fig.3 Circuit current
Supply voltage: Vcc[V]
Fig.4 Hall input hysteresis voltage
0.0
0.0
-0.2
Output high voltage: Voh[V]
Output high voltage: Voh[V]
-0.2
-0.4
-0.4
-0.6
–40°C
-0.6
17V
-0.8
25°C
12V
-0.8
100°C
-1.0
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
5V
0.6
0.7
Output source current: Io[A]
Fig.5 Output high voltage (Vcc=12V)
Output source current: Io[A]
Fig.6 Output high voltage (Ta=25°C)
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
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TSZ02201-0H1H0B100170-1-2
28.JUL.2012 Rev.002
BD6721FS
●Typical
performance curves(Reference data)
Datasheet
1.0
1.0
5V
0.8
Output low voltage: Vol[V]
100°C
0.8
Output low voltage: Vol[V]
12V
0.6
25°C
0.6
17V
0.4
–40°C
0.4
0.2
0.2
0.0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Output sink current: Io[A]
Fig.7 Output low voltage (Vcc=12V)
Output sink current: Io[A]
Fig.8 Output low voltage (Ta=25°C)
0.7
7.0
0.6
100°C
–40°C
25°C
Lock detection OFF time: Toff[s]
Lock detection ON time: Ton[s]
6.0
100°C
–40°C
25°C
0.5
5.0
0.4
Operating range
4.0
Operating range
0.3
0
5
10
15
20
3.0
0
5
10
15
20
Supply voltage: Vcc[V]
Fig.9 Lock detection ON time
Supply voltage: Vcc[V]
Fig.10 Lock detection OFF time
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/13
TSZ02201-0H1H0B100170-1-2
28.JUL.2012 Rev.002
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