Datasheet
DC Brushless Fan Motor Drivers
Multifunction Single-phase Full-wave
Fan Motor Driver
BD6971FV
●General
description
BD6971FV is a 1chip driver that composes H-bridge of
power DMOS FET.
It is possible to correspond to a small motor by starting
from 3.5V and installing in the SSOP small package.
●Features
SSOP small package
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
●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
Reference voltage (REF) output current
Hall bias (HB) output current 1
Hall bias (HB) output current 2
Input voltage (H+, H–, TH, MIN, CS)
Junction temperature
*1
*2
*3
●Package
SSOP-B14
W (Typ.) x D (Typ.) x H (Max.)
5.00mm x 6.40mm x 1.35mm
SSOP-B14
Symbol
Vcc
Pd
Topr
Tstg
Vo
Io
Vfg
Ifg
Iref
Ihb1
Ihb2
Vin
Tj
Limit
20
874.7
*1
–40 to +100
–55 to +150
20
1.0
*2
20
10
5
5
10
*3
7
150
Unit
V
mW
°C
°C
V
A
V
mA
mA
mA
mA
V
°C
Reduce by 7.0mW/°C over Ta=25°C. (On 70.0mm×70.0mm×1.6mm glass epoxy board)
This value is not to exceed Pd.
The condition of Ta=25°C and Vcc=12V
●Recommended
operating conditions
Parameter
Operating supply voltage range
Operating input voltage range 1 (H+, H–)
(more than Vcc=9V)
Operating input voltage range 1 (H+, H–)
(less than Vcc=9V)
Operating input voltage range 2 (TH, MIN)
○Product
structure：Silicon monolithic integrated circuit
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
Symbol
Vcc
Limit
3.5 to 17.0
0 to 7
Unit
V
V
V
V
Vin1
0 to Vcc–2
Vin2
0 to Vref
○This
product is not designed protection against radioactive rays
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TSZ02201-0H1H0B100150-1-2
28.JUL.2012 Rev.002
BD6971FV
●Pin
configuration
(TOP VIEW)
●Pin
description
P/No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
T/Name
FG
H–
HB
H+
CS
OUT2
RNF
OUT1
Vcc
REF
TH
MIN
OSC
GND
Datasheet
Function
Speed pulse signal output terminal
Hall – input terminal
Hall bias terminal
Hall + input terminal
Output current detection terminal
Motor output terminal 2
Output current detecting resistor
connecting terminal (motor ground)
Motor output terminal 1
Power supply terminal
Reference voltage output terminal
Output duty controllable input terminal
Minimum output duty setting terminal
Oscillating capacitor connecting
terminal
Ground terminal (signal ground)
FG
H–
HB
H+
CS
OUT2
RNF
1
2
3
4
5
6
7
Fig.1 Pin configuration
14
13
12
11
10
9
8
GND
OSC
MIN
TH
REF
Vcc
OUT1
●Block
diagram
FG
SIGNAL
OUTPUT
HALL
AMP
1
PWM SOFT
SWITCHING
TSD
GND
14
2
H–
HALL
COMP
OSC
OSC
13
3
HB
HALL
BIAS
CONTROL
LOGIC
PWM
COMP
MIN
12
4
H+
Vcl
LOCK
PROTECT
PWM
COMP
TH
QUICK
START
11
5
CS
CURRENT
LIMIT COMP
REF
PRE-
DRIVER
REF
10
6
OUT2
Vcc
9
7
RNF
OUT1
8
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.
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TSZ02201-0H1H0B100150-1-2
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BD6971FV
●Electrical
characteristics(Unless otherwise specified Ta=25°C, Vcc=12V)
Parameter
Circuit current
Hall input hysteresis + voltage
Hall input hysteresis – voltage
Output voltage
Lock detection ON time
Lock detection OFF time
FG output low voltage
FG output leak current
OSC high voltage
OSC low voltage
OSC charge current
OSC discharge current
Output ON duty 1
Output ON duty 2
Output ON duty 3
Reference voltage
Hall bias voltage 1
Hall bias voltage 2
Current limit setting voltage
TH input bias current
MIN input bias current
CS input bias current
Symbol
Icc
Vhys+
Vhys–
Vo
Ton
Toff
Vfgl
Ifgl
Vosch
Voscl
Icosc
Idosc
Poh1
Poh2
Poh3
Vref
Vhb1
Vhb2
Vcl
Ith
Imin
Ics
Min.
3
4
–18
-
0.3
3.0
-
-
2.3
0.8
–16
4
75
45
15
5.8
1.10
1.05
280
-
-
-
Limit
Typ.
5
9
–13
0.6
0.5
5.0
0.15
-
2.5
1.0
–8
8
80
50
20
6.0
1.30
1.25
310
-
-
-
Max.
8
16
–8
0.9
0.7
7.0
0.30
10
2.7
1.2
–4
16
85
55
25
6.2
1.50
1.48
340
–0.2
–0.2
–0.2
Unit
mA
mV
mV
V
s
s
V
µA
V
V
µA
µA
%
%
%
V
V
V
mV
µA
µA
µA
Io=±200mA,
High and low side total
Conditions
Datasheet
Ref.
data
Fig.3
Fig.4
Fig.4
Fig.5 to 8
Fig.9
Fig.10
Fig.11, 12
Fig.13
Fig.14
Fig.14
Fig.15
Fig.15
-
-
-
Fig.16, 17
Fig.18, 19
Fig.19
Fig.20
Fig.21
Fig.22
Fig.23
Ifg=2mA
Vfg=17V
Vth=Vref x 0.222
Output 1kΩ, OSC=100pF
Vth=Vref x 0.294
Output 1kΩ, OSC=100pF
Vth=Vref x 0.367
Output 1kΩ, OSC=100pF
Iref=–2mA
Ihb=–2mA
Ihb=–10mA
Vth=0V
Vmin=0V
Vcs=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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TSZ22111・15・001
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TSZ02201-0H1H0B100150-1-2
28.JUL.2012 Rev.002
BD6971FV
●Typical
performance curves(Reference data)
Datasheet
10
Hall input hysteresis voltage: Vhys[mV]
20
8
Circuit current: Icc[mA]
10
100°C
25°C
–40°C
6
100°C
25°C
–40°C
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]
100°C
25°C
–40°C
-0.2
-0.4
-0.4
-0.6
-0.6
-0.8
-0.8
-1.0
0.0
0.2
0.4
-1.0
1.0
0.0
3.5V
12V
17V
0.6
0.8
0.2
0.4
0.6
0.8
1.0
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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TSZ02201-0H1H0B100150-1-2
28.JUL.2012 Rev.002
BD6971FV
●Typical
performance curves(Reference data)
Datasheet
1.0
100°C
25°C
1.0
3.5V
12V
0.8
Output low voltage: Vol[V]
Output low voltage: Vol[V]
0.8
17V
0.6
–40°C
0.6
0.4
0.4
0.2
0.2
0.0
0.0
0.2
0.4
0.6
0.8
1.0
0.0
0.0
0.2
0.4
0.6
0.8
1.0
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
Lock detection OFF time: Toff[s]
Lock detection ON time: Ton[s]
6.0
0.5
–40°C
25°C
100°C
5.0
–40°C
25°C
100°C
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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TSZ22111・15・001
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TSZ02201-0H1H0B100150-1-2
28.JUL.2012 Rev.002
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